Pos Address Map - IBM Personal System/2 60 Technical Reference

POS Address Map
The following figure shows the organization of the 110 address space
used by POS. The POS registers are 8-bit registers. Bit 0 of POS
Register 2 and bits 6 and 7 of POS Register 5 are defined. All other
bits in POS Registers 2 through 5 are free-form.
Addre ••
(Hex) Function
0094 System Board Enable/Setup Register
0096 Adapter Enable/Setup Register
0100 P~S Register 0- Adapter Identification Byte (Low Byte)
0101 P~S Register 1- Adapter Identification Byte (High Byte)
0102
P~S
Register 2-0ption Select Data Byte 1
Bit 0 is Card Enable.
0103 P~S Register 3 - Option Select Data Byte 2
0104
P~S
Register 4-0ption Select Data Byte 3
0105 P~S Register 5-0ption Select Data Byte 4
Bit 7 is the channel check active indicator.
Bit 6 is the channel check status-available indicator.
0106 P~S Register 6-Subaddress Extension (Low Byte)
0107 P~S Register 7-Subaddress Extension (High Byte)
Figure
2-1. POS 1/0
Address Map
Model
60 POS
2-5