Octek HIPPO DCA 2, User Manual

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Appendix Advanced Technical Information
Hippo DCA2 User’s Manual
33
Block Size
0 Spare 8-bit 64
1 SDLC 8-bit 64
2 Floppy Disk 8-bit 64
3 Spare 8-bit 64
4 Cascade for DMA controller 1
5 Spare 16-bit 128
6 Spare 16-bit 128
7 Spare 16-bit 128
A.6
DMA Controller Registers
Address (Hex) Command Code
C0 CH-0 base and current address
C2 CH-0 base and current word count
C4 CH-1 base and current address
C6 CH-1 base and current word count
C8 CH-2 base and current address
CA CH-2 base and current word count
CC CH-3 base and current address
CE CH-3 base and current word count
D0 Read Status Register/Write Command Register
D2 Write Request Register
D4 Write Single Mask Register Bit
D6 Write Mode Register
D8 Clear Byte Pointer Flip-Flop
DA Read Temporary Register/Write Master Clear
DC Clear Master Register
DE Write All Mask Register Bits