From: tiffany@tron.bwi.wec.com (Robert Tiffany)
Subject: SCSI HD and CD-ROM problem with Adaptec 1542B (Part 2)
Organization: Westinghouse Electric Corporation
Distribution: na
Date: Tue, 26 Jan 1993 05:38:05 GMT

HELP ! (Please)

Several people are running 2+ SCSI devices with an adaptec 1542B, why
can't I ? :-(

I'm trying to get an IBM 3510 <Toshiba XM-3101BME> CD-ROM drive to co-exist
with a MAXTOR 7120 SCSI HD, and I'm having __NO__ luck.

I have been using the CD-ROM drive since October (data and playing Audio
CDs), and when I needed more Disk space, I decided to add a SCSI drive
instead of another IDE drive.  I can get either of the devices to work,
but not both at the same time.  The device with the SCSI ID closest to
0 wins.

	ALL SCSI DEVICES ARE SCSI 1.

System:	25 MHz AMD 386SX, Opti chipset, AMI BIOS, 10 Mb RAM.
	Maxtor 7120A IDE C: drive.

The card has default jumper settings, except: floppy disabled, 5.0 Mb/sec
transfer rate.

I am running the files from OS2CDROM.ZIP, and the 12-07-92 aha154x.add
from Adaptec's BBS.


    BASEDEV=AHA154X.ADD /V /A:0 /!DM:1,2
with the HD at 0, and CD-ROM at 2 or 1, I only get a D:,E:,F:,G: DASD HD
(that works 100%), and OS2CDROM.DMD doesn't install (SYS1201).


    BASEDEV=AHA154X.ADD /V /A:0 /!DM:2
with the HD at 3, and CD-ROM at 2, I get no DASD HD, but I get a D:
CD-ROM (that works 100%) and according to the drives icons, I have an
F: drive!

my playcd.exe program (IBM program that came with the 3510, for OS/2 1.2+)
recognizes drive F: as a valid CD-ROM drive, but one that is never ready
(as it is a MAXTOR 7120S fixed disk drive with DOS 3.3 size partitions).

NOTE:
with the HD at 3, and CD-ROM at 2, DOS 3.3 and ASPI4DOS.SYS / ASPIDISK.SYS
will recognize the HD, and it works great !


    BASEDEV=AHA154X.ADD /V /A:0 /DM:3 /!DM:0,1,2,4,5,6
gets rid of the extra F: drive icon, but still no HD.


I borrowed another 1542B from a friend, swapped it with my board,
and got the same results.

I also borrowed his Toshiba XM-3201B CD-ROM drive, again no luck.

With the following setup:

	Maxtor 7120S HD		ID 0
	Toshiba XM-3201B	ID 2
	Toshiba XM-3101BME	ID 4

	Verified with:	BIOS (debug, g=dc00:6), booting DOS and loading
			ASPI4DOS.SYS /D, and with SCSICNTL.EXE written
			by Roy Neese of Adaptec (unsupported SW, Roy
			is said to have written it on his own time).

Only the HD is accessable.

Shutting down, unplugging the HD power cord, and rebooting makes only
the CD-ROM at ID 2 accessable.

Shutting down, unplugging the CD (ID2) power cord, and rebooting makes only
the CD-ROM at ID 4 accessable.

Several cables and terminators have been tried.


CONFIG.SYS:	(exact order, with lines deleted)

    IFS=C:\OS2\HPFS.IFS /CACHE:512 /CREL:4 /AUTOCHECK:C
    IFS=C:\OS2\CDFS.IFS /Q
    . . .
    BUFFERS=30
    . . .
    BASEDEV=IBM1FLPY.ADD
    BASEDEV=IBM1S506.ADD
    BASEDEV=AHA154X.ADD /V /A:0 /DM:0 /!DM:1,2,3,4,5,6
    BASEDEV=TOSHCDS1.FLT
    BASEDEV=OS2ASPI.DMD
    BASEDEV=OS2DASD.DMD
    BASEDEV=OS2CDROM.DMD
    rem DEVICE=C:\OS2\CDROM.SYS /N:4
    . . .

    
FILES:		(OS/2 Service Pack XR06055 is installed over GA)

    10-20-92   1:05p      7284           0  TOSHCDS1.FLT
    11-16-92  11:52p      6472           0  OS2ASPI.DMD
    10-16-92   2:46a      6320           0  OS2ASPI.OLD.DMD
    11-04-92  12:12p     21168           0  OS2CDROM.DMD
    10-16-92   2:41a     32978           0  OS2DASD.DMD
    10-16-92   2:44a     10844           0  OS2SCSI.DMD
     8-13-92   2:56p     16150           0  AHA154X.OLD.ADD
    10-16-92   2:50a     25052           0  IBM1FLPY.ADD
    10-16-92   2:53a     13168           0  IBM1S506.ADD
both of these were tried:
    10-26-92   8:43p     16338           0  AHA154X.ADD
    12-07-92   5:01p     16662           0  aha154x.add
    

OS/2:

  I got rid of a
SYS2068: 1 messages lost 
  os/2 error (while config.sys was loading the 921207 aha154x.add with
  the /V switch) by changing from the default 5.7 to 5.0 Xfer rates!
  Strange ?

DOS:

  My system works at 8.0 MB/sec (set with jumpers) using BIOS and DOS,
  but hangs when loading ASPI4DOS.SYS.

  It works at 6.7 Mbytes/sec with ASPI4DOS.SYS /D /X01 which should
  override the card's jumpers (when set to 5.0 Mb/sec).



QUESTIONS:	Most SCSI users have more Motherboard horsepower than I
		do.  Could I be experiencing phasing problems ?

		When using 2 1542B's in a system, how should the second
		board be configured (for aha154x.add) ?

(a second 1542B is cheaper than a new 32 bit Motherboard and 2 4Mb SIMMS,
or another CD drive, AND I still have my friend's card :-) )

This all seems very puzzling to me, and if anyone has any suggestions,
I'm all ears.

Any help or suggestions will be GREATLY appreciated !

Thanks in advance,

Bob	tiffany@tron.bwi.wec.com