DIGITAL-LOGIC Microspace MSM586SEN Technical User Manual page 56

DIGITAL-LOGIC AG
I/O Ad- Read/Write
dress Status
00D2h W
00D4h W
00D6h W
00D8h W
00DAh R
00DAh W
00DCh W
00DEh W
00F0h W
00F1h W
00F2h - R / W
00FFh
0140h – R / W
014Fh
I/O addresses 0170h - 0177h are reserved for use with a secondary hard drive. See
addresses 01F0h - 01F7h for bit definitions.
0170h R / W
0171h R
0171h W
0172h R / W
Description
Write request register for DMA channels 4-7
Write single mask register bit for DMA channels 4-7
bits 7-3 = 0 Reserved
bit 2 = 0 Clear mask bit,
bits 1-0 = Channel select
00 Channel 4
01 Channel 5
10 Channel 6
11 Channel 7
Mode register for DMA channels 4-7
bits 7-6 = 00 Demand mode
01 Single mode
10 Block mode
11 Cascade mode
bit 5 = 0 Address increment select
1 Address decrement select
bit 4 = 0 Disable auto initialization
1 Enable auto initialization
bits 3-2 = Operation type
00 Verify operation
01 Write to memory
10 Read from memory
11 Reserved
bits 1-0 = Channel select
00 Channel 4
01 Channel 5
10 Channel 6
11 Channel 7
Clear byte pointer flip/flop for DMA channels 4-7
Read Temporary Register for DMA channels 4-7
Master Clear for DMA channels 4-7
Clear mask register for DMA channels 4-7
Write mask register for DMA channels 4-7
Math coprocessor clear busy latch
Math coprocessor reset
Math coprocessor
SCSI Controller if installed
Data register for hard drive 1
Error register for hard drive 1
Precomposition register for hard drive 1
Sector count - hard drive 1
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MSM586SEN/SEV Manual V1.5E
1 Set mask bit
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