User's Manual

Output Port Bit Definition
Pin 21 - Bit 0
System Reset
Pin 22 - Bit 1 Gate A20 of system processor
0 A20 inhibited
1 A20 Not inhibited
Pin 23 - Bit 2 Undefined
Pin 24 - Bit 3 System speed selection
0 Normal
1 33MHz, Turbo
Pin 35 - Bit 4 Output buffer full
0 Not full
1 Full (IRQ1)
Pin 36 - Bit 5 Undefined
Pin 37
- Bit 6 Keyboard clock (output)
Pin 38 - Bit 7 Keyboard data (output)
32-Bit Memory Expansion Bus
The 32-bit memory expansion bus optimizes the memory subsystem
to take advantage of the 32-bit architecture of the 80386. This bus is
not intended to be a general-purpose, industry-standard of the 32-bit
expansion bus. It is simply a mechanism to optimize the performance
of the PEM-3301 memory subsystem for the 80386 architecture.
Chapter 6: Appendix 43