Lenovo ThinkPad 770X Technical Reference Manual for the ThinkPad 770 - Page 13
System Board Devices and Features, IBM Personal System/2 Hardware Interface Technical Reference
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System Board Devices and Features Figure 1-2 lists the system board devices and their features. The IBM Personal System/2 Hardware Interface Technical Reference describes devices common to PS/2 products by type number. Device Microprocessor External cache System timers ROM subsystem RAM subsystem CMOS RAM subsystem EEPROM subsystem Video subsystem Type - Features Intel Pentium® processor with the MMX™ technology 200 or 233 MHz 32 KB on-chip cache - 512 KB (write back) 1 Channel 0: system timer Channel 1: refresh generation Channel 2: tone generator for speaker - 128 KB by 4 banks (1 KB equals 1024 bytes) - 32 to 256 MB (1 MB equals 1,048,576 bytes) - 128 bytes CMOS RAM with real-time clock/calendar + 4 K byte NVRAM - 1 K bits - XGA video functions: Up to 65,536 colors on the TFT XGA (1024x768) LCD Up to 16,777,216 colors on an external monitor DMA controller See "Video Subsystem" on page 3-2 for more details on the video subsystem. 1 Seven DMA channels (AT compatible:) Four 8-bit channels and three 16-bit channels Figure 1-2 (Part 1 of 2). System Board Devices and Features System Overview 1-3
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