Specifications

Appendix A: Chipset and I/O map
67
Table A-8. DMA page registers: Intel EX 82371EB of PC/AT
I/O Addr Functional group R/W Usage
0080 DMA R DMA page (reserved)
0081 R/W DMA channel 2 page register
0082 R/W DMA channel 3 page register
0083 R/W DMA channel 1 page register
0084 R/W DMA page (reserved)
0085 R/W DMA page (reserved)
0086 R/W DMA page (reserved)
0087 R/W DMA channel 0 page register
0089 R/W DMA channel 6 page register
008A R/W DMA channel 7 page register
008B R/W DMA channel 5 page register
008C R/W DMA page (reserved)
008D R/W DMA page (reserved)
008E R/W DMA page (reserved)
008F R/W DMA low page register refresh
Ta b l e A - 9 . Po r t A
I/O Addr Functional group R/W Usage
0092 Port A R/W Fast A20 and reset control
Table A-10. VGA controller
I/O Addr Functional group R/W Usage
x094 VGA controller R/W POS102 access control
Table A-11. Second interrupt controller
I/O Addr Functional group R/W Usage
00A0 Interrupt controller 2 R/W INT 2 control
00A1 R/W INT 2 mask
Table A-12. Power management controller
I/O Addr Functional group R/W Usage
00B2 Power management R/W Control
00B3 R/W Status