Compaq MSB900 - Manual (Page 38)

DIGITAL-LOGIC AG MSB900/L Detailed Technical Manual V1.0
38
I/O Map Continued…
I/O Addr. Function Size R/W Comment
0CCh Master DMA Address - Channel 7 8bit Yes 16bit values in two transfers.
0CDh No Specific Usage 8bit ---
0CEh Master DMA Counter - Channel 7 8bit Yes 16bit values in two transfers.
0CFh No Specific Usage 8bit ---
0D0h Master DMA Command/Status – Channels [7:4] 8bit Shw$
0D1h No Specific Usage 8bit ---
0D2h Master DMA Request - Channels [7:4] 8bit WO
0D3h No Specific Usage 8bit ---
0D4h Master DMA Mask - Channels [7:4] 8bit Yes
0D5h No Specific Usage 8bit ---
0D6h Master DMA Mode - Channels [7:4] 8bit Shw@
0D7h No Specific Usage 8bit ---
0D8h Master DMA Clear Pointer - Channels [7:4] 8bit WO
0D9h No Specific Usage 8bit ---
0DAh Master DMA Reset - Channels [7:4] 8bit WO
0DBh No Specific Usage 8bit ---
0DCh Master DMA Reset Mask - Channels [7:4] 8bit WO
0DDh No Specific Usage 8bit ---
0DEh Master DMA General Mask - Channels [7:4] 8bit Shw@
0DFh No Specific Usage 8bit ---
0E0h-2E7h No Specific Usage --- ---
2E8h-2EFh UART/IR - COM4 8bit ---
MSR bit enables/disables into I/O
2EFh space. (UART1 MSR
51400014h[18:16], UART2 MSR
51400014h[22:20]). Defaults to
LPC.
2F0h-2F7h No Specific Usage --- ---
2F8h-2FFh UART/IR - COM2 8bit ---
MSR bit enables/disables into I/O
2FFh space. (UART1 MSR
51400014h[18:16], UART2 MSR
51400014h[22:20]). Defaults to
LPC.
300h- 36Fh No Specific Usage --- ---
370h Floppy Status R A 8bit RO Second Floppy.
371h Floppy Status R B 8bit RO Second Floppy.
372h Floppy Digital Out 8bit Shw@ Second Floppy.
373h No Specific Usage 8bit ---
374h Floppy Cntrl Status 8bit RO Second Floppy.
375h Floppy Data 8bit Yes Second Floppy.
376h No Specific Usage 8bit ---
377h Floppy Conf Reg 8bit Shw$ Second Floppy.
378h-3E7h No Specific Usage --- ---
3E8h-3EFh UART/IR - COM3 8bit ---
MSR bit enables/disables into I/O
3EFh space. (UART1 MSR
51400014h[18:16], UART2 MSR
51400014h[22:20]). Defaults to
LPC.
3F0h Floppy Status R A 8bit RO First Floppy.
Continued…