Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Toshiba Libretto
Table title:
Models
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Model </th><th colspan=1 rowspan=1 > Specifications </th><th colspan=1 rowspan=1 > Dimensions (mm) </th><th colspan=1 rowspan=1 > Mass (g) </th></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Libretto 20 </th><td class="highlighted"  colspan=1 rowspan=1 > AMD 486 DX4 75 MHz, 8 MB RAM (20 MB max.), 270 MB hard disk, 6.1" TFT display </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > 840 </td></tr>
<tr> <th class="highlighted"  colspan=1 rowspan=1 > Libretto 30 </th><td class="highlighted"  colspan=1 rowspan=1 > AMD 486 DX4 100 MHz, 8 MB RAM (20 MB max.), 500 MB hard disk, 6.1" TFT display </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > " " </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 50 </th><td colspan=1 rowspan=1 > Intel Pentium 75 MHz, 16 MB RAM (32 MB max.), 810 MB hard disk, 6.1-inch TFT display </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > 850 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 50M </th><td colspan=1 rowspan=1 > Specification as Libretto 50 + 6.1" TFT touch-screen display specially built for the Meiji Life insurance company in Japan. Around 40,000 units were made </td><td colspan=1 rowspan=1 >  </td><td colspan=1 rowspan=1 > n/a </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 60 </th><td colspan=1 rowspan=1 > Intel Pentium 100 MHz, 16 MB RAM (32 MB max.), 810 MB hard disk, 6.1" TFT display </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > 850 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto D2 </th><td colspan=1 rowspan=1 > A rebadged L60, also known as the M2 (Mobile Pack2) released by NTT DoCoMo with PCMCIA Modem Card for use with the DoCoMo CDMA Network (released only in Japan) </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > " " </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 70 </th><td colspan=1 rowspan=1 > Intel Pentium 120 MHz MMX, 16 MB RAM (32 MB max.), 1.6 GB hard disk, 6.1" TFT display </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > " " </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 100 </th><td colspan=1 rowspan=1 > Intel Pentium 166 MHz MMX, 32 MB RAM (Officially 64 MB max. 96 MB max by modding SS/ff & Portege 3010 RAM Module.), 2.1 GB hard disk, 7.1" TFT display </td><td colspan=1 rowspan=1 > 210×132×35 </td><td colspan=1 rowspan=1 > 950 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto SS1000 </th><td colspan=1 rowspan=1 > Intel Pentium 166 MHz MMX, 32 MB RAM (96 MB max.), 2.1 GB (6.5 mm high ) HDD, 6.1" TFT display </td><td colspan=1 rowspan=1 > 215×125×24.5 </td><td colspan=1 rowspan=1 > 820 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto SS1010 </th><td colspan=1 rowspan=1 > Intel Pentium 233 MHz MMX, 64 MB RAM (96 MB max. Has 32 MB RAM on board.), 2.1 GB (6.5 mm high) HDD, 6.1" TFT display. </td><td colspan=1 rowspan=1 > 215×125×24.5 </td><td colspan=1 rowspan=1 > " " </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto M3 </th><td colspan=1 rowspan=1 > Intel Pentium 133 MHz MMX, 32 MB RAM (96 MB max.), 2.1 GB hard disk, 6.1" TFT display. (released only in Japan by NTT DoCoMo) </td><td colspan=1 rowspan=1 > 210×115×34 </td><td colspan=1 rowspan=1 > 850 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto 110 </th><td colspan=1 rowspan=1 > Intel Pentium 233 MHz MMX, 32 MB RAM (Officially 64 MB max. 96 MB max by modding SS/ff & Portege 3010 RAM Module.), 4.3 GB hard disk, 7.1" TFT display </td><td colspan=1 rowspan=1 > 210×132×35 </td><td colspan=1 rowspan=1 > 950 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto ff 1050 </th><td colspan=1 rowspan=1 > Intel Pentium 233 MHz MMX, 32 MB RAM (96 MB max.), 3.2 GB hard disk, 6" STN display. Optional multimedia remote (released only in Japan) </td><td colspan=1 rowspan=1 > 221×132×29.8 </td><td colspan=1 rowspan=1 > 900 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto ff 1100 </th><td colspan=1 rowspan=1 > Intel Pentium 266 MHz MMX, 64 MB RAM (SO-DIMM expandable to 128 MB), 3.2 GB hard disk, 7.1" TFT display, built-in digital camera & multimedia remote controller (released only in Japan) </td><td colspan=1 rowspan=1 > 221×132×29.8 </td><td colspan=1 rowspan=1 > 980 </td></tr>
<tr> <th colspan=1 rowspan=1 > Libretto ff 1100v </th><td colspan=1 rowspan=1 > As per ff1100 but with 6.4 GB hard disk (released only in Japan) </td><td colspan=1 rowspan=1 > 221×132×29.8 </td><td colspan=1 rowspan=1 > " " </td></tr>
</table>
Question:
What did the first Libretto models use?
Answer:
The first Libretto models, the L20 & L30 used AMD 486.