User`s guide

A.2 PCI Sparse I/O Space
Table A–7 SIO PCI-to-ISA Bridge Operating Register Address Space Map
Offset Address Register
000 85.C000.0000 DMA1 CH0 Base and Current Address
001 85.C000.0020 DMA1 CH0 Base and Current Count
002 85.C000.0040 DMA1 CH1 Base and Current Address
003 85.C000.0060 DMA1 CH1 Base and Current Count
004 85.C000.0080 DMA1 CH2 Base and Current Address
005 85.C000.00A0 DMA1 CH2 Base and Current Count
006 85.C000.00C0 DMA1 CH3 Base and Current Address
007 85.C000.00E0 DMA1 CH3 Base and Current Count
008 85.C000.0100 DMA1 Status and Command
009 85.C000.0120 DMA1 Write Request
00A 85.C000.0140 DMA1 Write Single Mask Bit
00B 85.C000.0160 DMA1 Write Mode
00C 85.C000.0180 DMA1 Clear Byte Pointer
00D 85.C000.01A0 DMA1 Master Clear
00E 85.C000.01C0 DMA1 Clear Mask
00F 85.C000.01E0 DMA1 Read/Write All Mask Register Bits
020 85.C000.0400 INT 1 Control
021 85.C000.0420 INT 1 Mask
040 85.C000.0800 Timer Counter 1 - Counter 0 Count
041 85.C000.0820 Timer Counter 1 - Counter 1 Count
042 85.C000.0840 Timer Counter 1 - Counter 2 Count
043 85.C000.0860 Timer Counter 1 - Command Mode
060 85.C000.0C00 Reset UBus IRQ12
061 85.C000.0C20 NMI Status and Control
070 85.C000.0E00 CMOS RAM Address and NMI Mask
078–07B 85.C000.0F18 BIOS Timer
080 85.C000.1000 DMA Page Register Reserved
081 85.C000.1020 DMA Channel 2 Page
082 85.C000.1040 DMA Channel 3 Page
(continued on next page)
I/O Space Address Maps A–9