<PAGE>   1

================================================================================

                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549



                                  FORM 10-QSB/A



          [X]   QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                For the quarterly period ended September 30, 1998


                                       OR


          [ ]  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)
                     OF THE SECURITIES EXCHANGE ACT OF 1934
                  For the transition period from _____ to _____



                         Commission File Number: 0-25612



                              STARBASE CORPORATION
             (Exact name of Registrant as specified in its charter)



                Delaware                                     33-0567363
     (State or other jurisdiction of                      (I.R.S. Employer
     incorporation or organization)                    Identification Number)


      4 Hutton Centre Dr. Suite 800
          Santa Ana, California                                 92707
(Address of principal executive offices)                     (Zip code)



                                 (714) 445-4400
              (Registrant's telephone number, including area code)



Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the preceding 12 months (or for such shorter period that the registrant was
required to file such reports), and (2) been subject to such filing requirements
for the past 90 days. Yes [X]   No [ ]



Number of shares outstanding as of October 30, 1998: Common Stock:    21,233,418
                                                     Preferred Stock:  1,432,203

Transitional Small Business Disclosure Format:         Yes [ ]         No [X]

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<PAGE>   2

                              STARBASE CORPORATION

                                TABLE OF CONTENTS


<TABLE>
<S>                                                                                                   <C>
PART I.       FINANCIAL INFORMATION

    ITEM 1.   Financial Statements

              Balance Sheets at September 30, 1998 (Unaudited) (as restated) and March 31, 1998        3

              Statements of Operations (Unaudited) (as restated) for the six month
              period ended September 30, 1998 and 1997                                                 4

              Statements of Cash Flows (Unaudited) (as restated) for the six month
              period ended September 30, 1998 and 1997                                                 5

              Notes to Financial Statements (Unaudited) (as restated)                                  6

    ITEM 2.   Management's Discussion and Analysis of Financial Condition
              and Results of Operations                                                               10

PART II.      OTHER INFORMATION

    ITEM 5.   Other Information                                                                       13

    ITEM 6.   Exhibits and Reports on Form 8-K                                                        14
</TABLE>


                                       2
<PAGE>   3

                                     PART I

                                     ITEM 1
                              FINANCIAL STATEMENTS

                              STARBASE CORPORATION

                                 BALANCE SHEETS
             (in thousands, except number of shares and par values)

<TABLE>
<CAPTION>
                                                                   September 30,       March 31,
                                                                       1998              1998
                                                                   -------------       ---------
                                                                    (unaudited)
                                                                   (as restated)
<S>                                                                <C>                 <C>
ASSETS

Current Assets:
  Cash and cash equivalents                                          $  1,287           $  4,167
  Restricted cash                                                         118                  0
  Accounts receivable, net of allowances of $118
   (Sept 30, 1998) and $89 (Mar 31, 1998)                               1,550                464
  Notes and other receivables                                              14                 45
  Prepaid expenses and deferred charges                                   393                113
  Inventories                                                              73                 57
                                                                     --------           --------
    Total current assets                                                3,435              4,846

Property and equipment, net                                             1,125                747
Note receivable from officer                                               92                 76
Other non-current assets                                                   43                 13
                                                                     --------           --------
Total assets                                                         $  4,695           $  5,682
                                                                     ========           ========

LIABILITIES AND SHAREHOLDERS' EQUITY

Current Liabilities:
  Accounts payable and accrued liabilities                           $  1,330           $    941
  Deferred income                                                         405                263
  Current portion of capital lease obligation                             106                 10
                                                                     --------           --------
    Total current liabilities                                           1,841              1,214

Capitalized lease obligation, less current portion                        163                 38
                                                                     --------           --------
    Total liabilities                                                   2,004              1,252

Shareholders' equity:
  Preferred stock, $.01 par value; $5,152 (September 30,
    1998) and $4,716 (March 31, 1998) liquidation value;
    authorized 10,000,000; issued and outstanding 1,644,703
    shares (September 30, 1998) and 3,772,953 (March 31,
    1998)                                                                  16                 38
  Common stock, $.01 par value; authorized 50,000,000;
    issued and outstanding 20,856,250 (September 30, 1998)
    and 18,580,499 (March 31, 1998)                                       209                186
 Additional paid-in capital                                            49,790             46,287
 Accumulated deficit                                                  (47,324)           (42,081)
                                                                     --------           --------

  Total shareholders' equity                                            2,691              4,430
                                                                     --------           --------

Total liabilities and shareholders' equity                           $  4,695           $  5,682
                                                                     ========           ========
</TABLE>



     The accompanying notes are an integral part of the financial statements


                                        3
<PAGE>   4

                              STARBASE CORPORATION

                            STATEMENTS OF OPERATIONS
                                   (Unaudited)
                    (in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                    Three months ended             Six months ended
                                                       September 30,                 September 30,
                                                --------------------------     -------------------------
                                                     1998                         1998
                                                (as restated)       1997       as restated)       1997
                                                -------------     --------     ------------     --------
<S>                                                <C>            <C>            <C>            <C>
Revenues:
  Products                                         $  1,371       $    277       $  2,264       $    504
  Maintenance & training                                187             53            339             94
  License and royalty                                    86             36            195            106
                                                   --------       --------       --------       --------

    Total revenues                                    1,644            366          2,798            704

Cost of Sales:
  Products, licenses and other                           97             23            336             55
                                                   --------       --------       --------       --------

Gross margin                                          1,547            343          2,462            649

Operating Expenses:
  Research and development                            1,085            561          2,138          1,105
  Selling, general and administrative                 3,096          1,203          5,277          2,321
                                                   --------       --------       --------       --------

    Total operating expenses                          4,181          1,764          7,415          3,426
                                                   --------       --------       --------       --------

  Operating loss                                     (2,634)        (1,421)        (4,953)        (2,777)

  Interest income                                        11             24             53             49
  Interest expense                                       (3)          (360)            (5)          (361)
  Other income and expense                               (3)           (14)            (4)           (14)
                                                   --------       --------       --------       --------
  Total interest and other income and expense             5           (350)            44           (326)

Loss before income taxes                             (2,629)        (1,771)        (4,909)        (3,103)

  Provision for income taxes                              2              1              2              1
                                                   --------       --------       --------       --------

Net loss                                             (2,631)        (1,772)        (4,911)        (3,104)

  Non-cash dividend                                     178             --            334          1,660

Net loss applicable to common stockholders         $ (2,809)      $ (1,772)      $ (5,245)      $ (3,104)
                                                   ========       ========       ========       ========

Per share data:
  Basic and diluted loss per common share          $  (0.15)      $  (0.13)      $  (0.29)      $  (0.24)
                                                   ========       ========       ========       ========

  Weighted average number of
   common shares outstanding                         18,378         13,629         17,932         12,820
                                                   ========       ========       ========       ========
</TABLE>



     The accompanying notes are an integral part of the financial statements


                                        4
<PAGE>   5

                              STARBASE CORPORATION

                            STATEMENTS OF CASH FLOWS
                                   (Unaudited)
                                 (in thousands)

<TABLE>
<CAPTION>
                                                         Six months ended
                                                           September 30,
                                                     ------------------------
                                                         1998
                                                     (as restated)      1997
                                                     -------------    -------
<S>                                                     <C>           <C>
Cash Flows from Operating Activities:
  Net loss                                              $(4,911)      $(3,104)
  Adjustments to reconcile net loss to
    net cash used in operating activities:
    Depreciation and amortization                           166           107
    Provision for doubtful accounts and sales
     returns                                                 44            58
    Loss on disposition of property, equipment and
     capital lease                                            3            --
    Stock option compensation                               130            --
    Recognition of deferred income                          142            --
    Amortization of financing costs                          --            13
    Amortization of debt discount                            --           340
    Other adjustments                                        --            --
    Changes in assets and liabilities, excluding
      the effect of Non-cash transactions:
      Accounts receivable                                (1,130)         (146)
      Notes and other receivables                            31            26
      Inventories                                           (16)           11
      Prepaid expenses and deferred charges                (280)           14
      Other assets                                          (50)           (1)
      Accounts payable and accrued liabilities              611           125
                                                        -------       -------

Net cash used by operations                              (5,260)       (2,557)

Cash Flows from Investing Activities:
  Increase in restricted cash                              (118)           --
  Capital expenditures                                     (547)          (64)
                                                        -------       -------

Net cash used by investing activities                      (665)          (64)

Cash Flows from Financing Activities:
  Proceeds from sale of preferred stock                   3,000            --
  Proceeds from  sale of convertible debentures              --         3,100
  Proceeds from issuance of common stock:
    From stock purchase plan                                 --            --
    From private placements                                  92            --
    From exercise of options                                 23            12
    From exercise of warrants                                --            --
  Payment of financing related costs                        (48)         (286)
  Payments on capitalized lease obligations                 (23)           (3)
  Loans from officers/directors                              --            --
  Repayment of loans from officers/directors                 --            --
  Repayment of (disbursement of) loan to officer             --            --
                                                        -------       -------

Net cash provided (used) by financing activities          3,045         2,823
                                                        -------       -------

Net increase (decrease) in cash                          (2,880)          202

Cash and cash equivalents, beginning of period            4,167         2,722
                                                        -------       -------

Cash and cash equivalents, end of period                $ 1,287       $ 2,924
                                                        =======       =======
</TABLE>



     The accompanying notes are an integral part of the financial statements


                                       5
<PAGE>   6

                              STARBASE CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                                   (Unaudited)


1.    DESCRIPTION OF BUSINESS

StarBase Corporation, a Delaware corporation (the "Company"), is a leading
provider of advanced Internet and intranet based technical collaboration and
software configuration management (SCM) tools. The Company develops, markets and
supports team-oriented development software that targets the evolving needs of
corporate info-structures which support projects requiring technical
collaboration on an enterprise level. The Company's current product line
consists of the recently launched products StarTeam(R) 3.0 and StarTeam(R) 2000,
as well as RoundTable(R) and Versions(R). StarTeam 3.0 has been recognized in
the industry as the only product to effectively integrate the essential
components of SCM tools in one easy-to-use and intuitive interface built on top
of a collaborative framework. The Company has chosen to focus on technical
collaboration and team productivity since the wide usage of the Internet has
created a tremendous potential market for distributed project teams needing
secure, remote access to projects. Additionally, StarTeam 2000 is specifically
designed to address the complex and mission critical issues involved with the
management, asset tracking and reporting issues surrounding Year 2000 compliance
projects. The Company has also practically eliminated the barriers to entry for
current users of other SCM tools by inter-operating with the leading Windows
based SCM products. Furthermore, the Company's products utilize and are tightly
integrated with various Microsoft technologies, a market leader in technology
software.

2.   BASIS OF PRESENTATION

The unaudited interim financial statements have been prepared pursuant to the
rules and regulations of the Securities and Exchange Commission. Accordingly,
certain information and footnote disclosures normally included in financial
statements prepared in accordance with generally accepted accounting principles
have not been presented. The accompanying unaudited financial statements should
be read in conjunction with the financial statements and the notes thereto
included in the StarBase Corporation report to the Securities and Exchange
Commission on Form 10-KSB/A, for the year ended March 31, 1998.

The interim financial statements reflect all normal recurring adjustments which
are, in the opinion of management, necessary for a fair presentation of the
Company's financial position, results of operations and cash flows for the
period presented. Certain prior period balances have been reclassified to
conform to current period classifications. The results of operations for the six
months ended September 30, 1998 are not necessarily indicative of the operating
results for a full year.

BASIC AND DILUTED LOSS PER COMMON SHARE

Earnings per common share is calculated by dividing the net loss by the weighted
average shares of common stock outstanding excluding 1,418,638 outstanding
common shares held in escrow. Common stock equivalents are considered
anti-dilutive and are excluded from this calculation.


                                       6
<PAGE>   7

                              STARBASE CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                                   (Unaudited)


In February 1997, the Financial Accounting Standard Board issued Statement of
Financial Accounting Standards No. 128, "Earnings Per Share" ("FAS 128"). FAS
128 establishes standards for computing and presenting earnings per share
("EPS"). It replaces the presentation of primary EPS with a presentation of
basic EPS. Basic EPS excludes dilution and is computed by dividing income
available to common stockholders by the weighted-average number of common shares
outstanding for the period. It also requires a reconciliation of the numerator
and denominator of the basic EPS computation to the numerator and denominator of
the diluted EPS computation. Diluted EPS is computed similarly to fully diluted
EPS pursuant to Accounting Principles Board Opinion No. 15. This statement was
adopted by the Company beginning with its quarterly period ended December 31,
1997 and, since the Company is considered a simple capital structure for
reporting EPS, previously reported loss per common share data were not affected

RESTRICTED CASH

On September 17, 1998, the Company pledged $118,000 of cash for an irrevocable
letter of credit related to the lease of new office space and was classified as
restricted cash on the balance sheet. The letter of credit will be reduced by
33.33% each year and will expire on July 2, 2001.

3.   COMPOSITION OF CERTAIN FINANCIAL STATEMENT CAPTIONS
<TABLE>
<CAPTION>
       (In thousands)                                        September 30,     March 31,
                                                                 1998            1998
                                                             -------------     ---------
<S>                                                             <C>             <C>
             ACCOUNTS RECEIVABLE
             Trade accounts receivable                          $ 1,668         $   553
             Less allowance for doubtful accounts                  (118)            (89)
                                                                -------         -------
                                                                $ 1,550         $   464
                                                                =======         =======

          PROPERTY AND EQUIPMENT
          Computer hardware                                     $ 1,418         $ 1,110
          Furniture and fixtures                                    282             255
          Computer software                                         282             269
          Leasehold improvements                                    208              40
                                                                -------         -------
                                                                  2,190           1,674
          Less accumulated depreciation and amortization         (1,065)           (927)
                                                                -------         -------

                                                                $ 1,125         $   747
                                                                =======         =======


          ACCOUNTS PAYABLE AND ACCRUED LIABILITIES
          Trade accounts payable                                $   618         $   390
          Accrued professional fees                                 257             255
          Accrued wages and bonuses                                 400             205
          Other accrued expenses                                     55              91
                                                                -------         -------

                                                                $ 1,330         $   941
                                                                =======         =======
</TABLE>


                                       7
<PAGE>   8

                              STARBASE CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                                   (Unaudited)

4.   RESTATEMENTS

The Company has restated the results of the first quarter of fiscal 1998 to
recognize a non-cash dividend aggregating $1,660,000 as a result of common stock
issued in exchange for warrants to acquire shares of the Company's common stock.
This dividend represents the excess of the fair value of the Company's common
stock on the offer date over the estimated fair value of the warrants exchanged.
The estimated fair value of the warrants was determined using the Black-Scholes
method. This dividend did not change overall shareholders' equity.

The Company offered the holders of the Company's outstanding warrants the option
to exchange all issued and outstanding warrants for shares of the Company's
common stock. Each warrant holder who accepted the offer by midnight, Pacific
Standard Time, on June 30, 1997, the expiration date of the offer, received one
share of common stock for every three warrants held. The warrants which remained
unexchanged subsequent to the expiration date of the offer continued under the
original terms of each warrant. At June 30, 1997, 4,734,534 warrants were
converted and 1,581,150 common shares had been issued upon conversion of such
warrants.

The Company has also restated the second quarter of fiscal 1999 financial
statements to recognize compensation expense of $130,000, determined using the
Black-Scholes pricing model, relating to the issuance of options to purchase
240,000 shares of common stock given to outside consultants. Such restatements
increased selling, general and administrative expenses, net loss, additional
paid-in-capital and accumulated deficit by $130,000 and increased the net loss
per basic and diluted share from $(.28) to $(.29) per share for the six months
ended September 30, 1998.

The restated financial statements also include an adjustment of $135,000 related
to the value of the beneficial conversion feature related to the issuance of the
Series G Preferred Stock warrants (see note 5). The affect of such restatement
is to increase the net loss applicable to common stock for the three and six
months ended September 30, 1998 by $135,000.

There are certain overhead expenses, such as facility and insurance expenses,
that have been reclassified from Selling, general & administrative to Research &
development. For the quarter ended September 30, 1997, the amount totaled
approximately $46,000.

5.   EQUITY TRANSACTIONS

The Company has authorized 50,000,000 shares of common stock and 10,000,000
shares of preferred stock with a par value of $0.01 per share. During the
quarter ending September 30, 1998, 400,000 shares of Series D Preferred Stock
and 1,281,350 shares of Series E Preferred Stock were converted into 449,502 and
1,281,350 shares of common stock, respectively.

Effective July 31, 1998, the Company completed a private placement of 3,100
shares of Series G Preferred Stock for $3,000,000. The Series G Preferred Stock
is not redeemable and has a liquidation preference of $1,000 per share. The
holders of Series G Preferred Stock are not entitled to receive any dividends
nor, except as provided by law, vote upon any matter relating to the business or
affairs of the Company or for any other purpose. Each share of Series G
Preferred Stock is convertible, after the holding period, into the Company's
common stock, at a conversion rate which is determined by dividing $1,000 by the
Conversion Price. The Conversion Price shall be the lesser of (a) $1.66 or (b)
95% of the average closing bid price of the three lowest bid prices of common
stock as reported by Bloomberg, L.P. for shares traded in the United States
during the 22 consecutive trading days preceding the conversion date. In
addition, the Company issued 627,534 warrants related to the Series G Preferred
Stock. Each warrant is exercisable for one share of common stock at $0.78
through August 29, 2000, after which the warrants will expire.


                                       8
<PAGE>   9

                              STARBASE CORPORATION

                          NOTES TO FINANCIAL STATEMENTS
                                   (Unaudited)

As of September 30, 1998, 150,000 shares of Series D Preferred Stock, 1,491,603
shares of Series E Preferred Stock and 3,100 shares of Series G Preferred Stock
were outstanding.

WARRANTS

Warrant activity for the six month period ended September 30, 1998 is as
follows:

<TABLE>
<CAPTION>
                                                                   Warrant Price
                                                    Shares           Per Share
                                                   ---------       -------------
<S>                                                <C>             <C>
          Outstanding at March 31, 1998            2,177,722        $1.25-$1.80
          Granted                                    627,534        $      0.78
          Exercised                                       --
          Expired                                         --
                                                   ---------
          Outstanding at September 30, 1998        2,805,256        $0.78-$1.80
                                                   =========
</TABLE>


6.   SUPPLEMENTAL CASH FLOW INFORMATION

<TABLE>
<CAPTION>
                                                                                     Six months
                                                                                 Ended September 30,
                                                                               -----------------------
            (In thousands)                                                      1998            1997
                                                                               -------         -------
<S>                                                                            <C>             <C>
          Interest paid                                                        $     5         $     4
          Income taxes paid                                                          2               1

          Non-cash investing and financing transactions:
            Non-cash preferred stock and common stock dividends                   (334)         (1,660)
            Conversion of preferred stock to common stock (Note 5)                  22               2
            Common stock issued in 3-for-1 warrant conversion  (Note 4)             --              15
            Equipment purchased under capitalized lease                             --              54
</TABLE>


7.   COMMITMENTS AND CONTINGENCIES

In July 1998, the Company entered into a sub-lease for new office space located
at 4 Hutton Centre Drive, Santa Ana, CA 92707. The new offices consist of 17,000
square feet costing approximately $27,000 per month through February 22, 2000.
The Company also entered into a lease agreement for 4,100 contiguous square feet
beginning October 1998 (pending build out) through September 2003 at a rate of
approximately $8,000 per month. In addition, the Company entered into a lease
agreement for the 17,000 square feet beginning February 23, 2000 through
September 2003 at a rate of approximately $41,000 per month.


                                       9
<PAGE>   10

                                     PART I

                                     ITEM 2
           MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
                            AND RESULTS OF OPERATIONS



RESULTS OF OPERATIONS

Total revenue increased in the three month period ended September 30, 1998 by
$1,278,000 or 349%, to $1,644,000, from $366,000 in the same three month period
of the previous year due to the increase in product, maintenance and training
revenue, $1,228,000, combined with the increase in license and royalty revenue
from the Company's Roundtable product of $50,000. Total revenue for the six
month period ended September 30, 1998, increased to $2,798,000 from $704,000 in
the same period of the prior year. The increase in product revenue has been
favorably affected by the February 1998 release of the StarTeam 3.0 family of
products.

Cost of Sales increased to $97,000 from $23,000 in the three month period ended
September 30, 1998 over the same quarter of the previous year and to $336,000
from $55,000 for the six month period ended September 30, 1998 over the same
period of the previous year due to the increase in product shipments. Cost of
sales consists primarily of manufacturing and related costs such as media,
documentation, product assembly and third party royalties. The Company
out-sources manufacturing for all software products, with the exception of the
Company's Roundtable product.

Operating expenses in the three month period ended September 30, 1998 increased
to $4,181,000 from $1,764,000 in the same quarter of the previous year. For the
six month period ended September 30, 1998, operating expenses increased to
$7,415,000 from $3,426,000. These increases were primarily due to the building
of the sales & marketing and research & development infrastructures. At
September 30, 1998, the Company had 101 employees, which consisted of 36 in
sales & marketing, 42 in research & development and 23 in general &
administrative. At September 30, 1997, the Company had 48 employees, which
consisted of 15 in sales & marketing, 24 in research & development and 9 in
general & administrative.

Research and development expenses. Research & development expenses include
personnel and other such direct and overhead expenses incurred in the
development of the Company's products. StarBase continues to make significant
investments in research and development to bring new products to market and to
support existing products. In the three month period ended September 30, 1998
overall research and development expenses increased to $1,085,000 compared to
$561,000 for the same period in the prior year and for the six month period
ended September 30, 1998 increased to $2,138,000 compared to $1,105,000 for the
same period in the prior year primarily as a result of the increase in
development staff.

Selling, general and administrative expenses. Selling, general & administrative
expenses for the three months ended September 30, 1998 increased approximately
$1,893,000 over the same period in the prior year. For the six month period
ended September 30, 1998 selling, general & administrative expenses increased to
$5,277,000 from $2,321,000 in the corresponding period of the prior year. These
increases were mainly the result of additional sales and marketing personnel
coupled with the advertising and promotion programs to launch the StarTeam 3.0
family of products.


                                       10
<PAGE>   11

INTEREST INCOME/EXPENSE

Interest income for the three month period ended September 30, 1998 decreased to
$11,000 compared to $24,000 for the same period in the prior year.

Interest expense for the three month period ended September 30, 1998 decreased
to $3,000 compared to $360,000 for the same period in the prior year. Prior
periods interest expense was a result of the non-cash beneficial conversion
feature for the Convertible Debentures.

INCOME TAXES

The Company has not recorded a current or deferred provision for federal income
taxes for any period to date, as a result of losses incurred since its
inception. Any provision for income taxes represents the minimum required for
state taxes.

NON-CASH DIVIDEND

Non-cash dividend for the three month period ended September 30, 1998 was
$178,000 due to the beneficial conversion feature of the Series G Preferred and
Warrants issued. There was no non-cash dividend for the three month period ended
September 30, 1997.

FORWARD LOOKING STATEMENTS AND FACTORS THAT MAY EFFECT FUTURE RESULTS

The following discussion contains forward-looking statements within the meaning
of Sections 21E and 27A of the Securities Exchange Act of 1934. These forward
looking statements are subject to risks and uncertainties. There are several
important factors that could cause actual results to differ materially from
those anticipated by the forward-looking statements contained in the following
discussion. Such factors include, but are not limited to, the growth rates of
certain market segments, the timing of software product introductions, market
acceptance of product introductions, the positioning of the Company's products
in those segments, price pressures and the rapidly changing competitive
environment in the software industry, success in technological advances and
their implementation, business conditions and the general economy, the Company's
ability to manage its business in its evolution from a development stage
company, and the Company's ability to establish strategic alliances. Additional
information on these and other risk factors which could affect the Company's
financial results is included in the Company's Annual Report for the fiscal year
ended March 31, 1998 on Form 10-KSB/A on file with the Securities and Exchange
Commission.

LIQUIDITY AND CAPITAL RESOURCES

Cash and cash equivalents on hand as of September 30, 1998 totaled $1,287,000
and $2,924,000 as of September 30, 1997. At September 30, 1998 the Company had
positive working capital of $1,594,000 compared to $2,477,000 at September 30,
1997.

During the six months ended September 30, 1998, the Company used $5,260,000 for
operations, an increase of approximately $2,700,000 over the amount used for
operations in the prior year. The increase was primarily due to the building of
the Company's infrastructure. Capital expenditures were approximately $547,000
and $64,000 during the six months ended September 30, 1998 and September 30,
1997, respectively.

In September 1998, the Company established an irrevocable standby letter of
credit in the amount of $118,000 for benefit of Starwood O.C. Portfolio 1, LLC,
the landlord of the Company's new office space located at 4 Hutton Centre Drive,
Santa Ana, CA 92707. The letter of credit will be reduced by 33.33% each year
and will expire on July 2, 2001.


                                       11
<PAGE>   12

The Company warrants products against defects for 90 days and has a policy
permitting the return of products within 30 days. Warranty costs and returns,
which are not significant, have historically been within management's
expectations. The Company has reserved approximately $118,000 at September 30,
1998 compared to $89,000 at March 31, 1998 for future returns and other
collection issues. The increase is due to greater revenue.

On July 31, 1998, the Company completed a private placement of 3,100 shares of
Series G Preferred Stock for $3,000,000. The Company believes that current cash
and operating revenues, combined with proceeds from the sale of debt and equity
securities during fiscal 1999, will be sufficient to allow the Company to
conduct its operations during the fiscal year that ends March 31, 1999.
Continuing operations thereafter will depend on cash flow from operations or the
Company's ability to raise additional funds through equity, debt, or other
financing. There can be no assurance, however, that such funds will be
available.

THE YEAR 2000

The Year 2000 Issue is the result of computer programs being written using two
digits rather than four to define the applicable year. Any computer programs
that have date-sensitive software may recognize a date using "00" as the
calendar year 1900 rather than the year 2000. This could result in a system
failure or miscalculations causing disruptions of operations, including, among
other things, a temporary inability to process transactions, send invoices, or
engage in similar normal business activities.

The Company believes that it has no exposure to Year 2000 issues for the
products it has sold, as the products were designed with four digit year
recognition.

The Company has begun its assessment of its internal systems affected by the
Year 2000 Issue and anticipates that it will not be required to modify or
replace significant portions of its software so that its computer systems will
properly utilize dates past December 31, 1999.

The Company has initiated communications with its significant suppliers and
customers to determine the extent to which the Company is vulnerable to those
third parties' failure to remediate their own Year 2000 Issue. There can be no
guarantee that the systems of other companies on which the Company's systems
rely will be timely converted, or that a failure to convert by another company,
or a conversion that is incompatible with the Company's systems, would not have
a material adverse effect on the Company.

NEW ACCOUNTING STANDARDS

In October 1997 and March 1998, the Accounting Standards Executive Committee
("AcSEC") issued Statement of Position ("SOP") 97-2, "Software Revenue
Recognition" and SOP 98-4, "Deferral of the Effective Date of a Provision of SOP
97-2, Software Revenue Recognition," respectively, which provide guidance on
applying generally accepted accounting principles in recognizing revenue on
software transactions and is effective for the Company's transactions entered
into subsequent to March 31, 1998. AcSEC is currently deliberating the potential
permanent deferral of certain provisions of SOP 97-2. The Company does not
believe that implementation of SOP 97-2 and SOP 98-4 will have a material
adverse affect on expected revenues or earnings.


                                       12
<PAGE>   13

                                     PART II


                                     ITEM 5
                                OTHER INFORMATION

None.


                                       13
<PAGE>   14

                                     ITEM 6
                        EXHIBITS AND REPORTS ON FORM 8-K


(a)      Exhibits


<TABLE>
<CAPTION>
 Exhibit                                                                                                 Ref./
 Number                                      Description Of Document                                     Page
---------- -------------------------------------------------------------------------------------------- -------
<C>        <S>                                                                                          <C>
  10.1     Form of Securities Purchase Agreement                                                         (A)
  10.2     Certificate of Designation (Series G Preferred Stock)                                         (A)
  10.3     Form of Registration Rights Agreement                                                         (A)
  10.4     Form of Warrant                                                                               (A)
  27       Financial data schedule
</TABLE>

-------------------------

(A)  Incorporated herein by reference to the Company's Form 8-K (file number
     0-25612) filed with the Commission on August 17, 1998.



(b)  Reports on Form 8-K

     A Report on Form 8-K with respect to the issuance of Series G Preferred
     Stock was filed with the Securities and Exchange Commission on August 17,
     1998.


                                       14
<PAGE>   15

SIGNATURES


Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned thereunto duly authorized.

                                        STARBASE CORPORATION


June 25, 1999                               /s/  Douglas S. Norman
Date                                    ----------------------------------------
                                            Douglas S. Norman
                                            Director of Finance
                                            Chief Accounting Officer



                                       15
<PAGE>   16
                                 EXHIBIT INDEX


EXHIBIT
NUMBER              DESCRIPTION
-------             -----------

  27                Financial Data Schedule