Intel 386 User Manual page 68

Table 4-2. Peripheral Register Addresses (Sheet 3 of 6)
Expanded PC/AT
Address Address
F08DH
F08EH
F08FH
F098H
F099H
F09AH
F09BH
F092H 0092H
F0A0H 00A0H
F0A1H 00A1H
F400H
F402H
F404H
F406H
F408H
F40AH
F40CH
F40EH
F410H
F412H
F414H
F416H
F418H
F41AH
F41CH
F41EH
F420H
F422H
NOTES:
1. Byte pointer in flip-flop in DMA determines which register is accessed.
2. Shaded rows indicate reserved areas.
Access Type
(Byte/Word)
Reserved
Reserved
Reserved
Byte DMA0BYC2
Byte DMA1BYC2
Reserved
Reserved
A20GATE and Fast CPU Reset
Byte PORT92
Slave Interrupt Controller
Byte ICW1s/IRRs/ISRs/
OCW2s/OCW3s
Byte ICW2s/ICW3s/ICW4s/
OCW1s/POLLs
Chip-select Unit
Word CS0ADL
Word CS0ADH
Word CS0MSKL
Word CS0MSKH
Word CS1ADL
Word CS1ADH
Word CS1MSKL
Word CS1MSKH
Word CS2ADL
Word CS2ADH
Word CS2MSKL
Word CS2MSKH
Word CS3ADL
Word CS3ADH
Word CS3MSKL
Word CS3MSKH
Word CS4ADL
Word CS4ADH
SYSTEM REGISTER ORGANIZATION
Register Name Reset Value
XX
XX
XXXXXX10B
XX
XX
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
0000H
4-17