Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 12
Description, ThinkPad, computer, IBM Personal, System/2 and Personal Computer BIOS Interface - thinkpad 770 support
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Description The IBM ThinkPad 770 computer (hereafter called the ThinkPad computer or the computer) is notebook-size computer that feature the AT bus architecture. Each computer supports one UltraBay II and one internal hard disk drive. The ThinkPad 770 computer also supports an internal CD-ROM drive or an internal DVD drive as an option. Programs can distinguish the foregoing computer model from other ThinkPad models by reading the system ID: Interrupt 15H Function code (AH)=23H and (AL)=10H. Returns (AL)=27H The system microprocessor contains an internal cache and cache controller. Figure 1-1 lists the model bytes, submodel bytes, and system clock speed of the system board for each model. Model 770 Model Byte (Hex) FC Submodel Byte (Hex) 01 System Clock 33 MHz Figure 1-1. Model and Submodel Bytes For a listing of the other systems, refer to the IBM Personal System/2 and Personal Computer BIOS Interface. 1-2 System Overview