Overview

This chipset is found in the 8576/9577 Lacuna models (i/s). It operates at 25MHz and 33MHz. In addition to the chips, it has the following PALs:

• IBM 68G3088
• IBM 95G9659
• IBM 68G3096
• IBM 95G9689

There has been no investigation to read these PALs. Their function is unknown.

10G4672 I/O controller

No datasheet exists for this chip. It is found in many later PS/2s. It includes the following functions:

• Micro Channel interface for internal peripherals (incl. POS)
• Interrupt controller
• Timers
• Keyboard and mouse controller
• Real time clock (RTC) and CMOS logic control (external)
• 2x Serial interface
• 1x Parallel interface
• 82077 floppy disk controller (FDC) support (external)
• EEPROM controller (external)

Further Info: https://www.ardent-tool.com/tech/ASIC_Info.html#10G4672

71G0438 System Controller

It implements the following functions:

• Memory controller
• I/O (Micro Channel) controller (BIU)
• DMA controller
• ECC logic
• Buffers

Further info:https://www.ardent-tool.com/tech/ASIC_Info.html#71G0438