Compaq MSB900 - Manual (Page 37)

DIGITAL-LOGIC AG MSB900/L Detailed Technical Manual V1.0
37
I/O Map Continued…
I/O Addr. Function Size R/W Comment
If KEL Memory Offset 100h[0] = 1(Emulation-
Enabled bit).
060h Keyboard/Mouse - Data Port 8bit Yes
If MSR 5140001Fh[0] = 1 (SNOOP bit) and
KEL Memory Offset 100h[0] = 0 (Emulation-
Enabled bit).
061h Port B Control 8bit Yes
062h-063h No Specific Usage --- ---
If KEL Memory Offset 100h[0] = 1
(Emulation-Enabled bit).
.
064h Keyboard/Mouse - Command/ Status 8bit Yes
If MSR 5140001Fh[0] = 1 (SNOOP
bit) and KEL Memory Offset 100h[0]
= 0 (Emulation-Enabled bit)
065h-06Fh No Specific Usage --- ---
070h-071h RTC RAM Address/Data Port 8bit Yes Options per MSR 51400014h[0]. (Note 1)
072h-073h High RTC RAM Address/Data Port 8bit Yes Options per MSR 51400014h[1].
074-077h No Specific Usage --- ---
078h-07Fh No Specific Usage --- ---
080h Post Code Display 8bit Rec Write LPC and DMA. Read only DMA.
081h DMA Channel 2 Low Page
082h DMA Channel 3 Low Page
083h DMA Channel 1 Low Page
8bit Rec
Upper addr bits [23:16]. Write LPC and
DMA. Read only DMA.
084h-086h No Specific Usage 8bit Rec Write LPC and DMA. Read only DMA.
087h DMA Channel 0 Low Page 8bit Rec
Upper addr bits [23:16]. Write LPC and DMA.
Read only DMA.
088h No Specific Usage 8bit Rec Write LPC and DMA. Read only DMA.
089h DMA Channel 6 Low Page
08Ah DMA Channel 7 Low Page
08B DMA Channel 5 Low Page
8bit Rec
Upper addr bits [23:16]. Write LPC and DMA.
Read only DMA.
08Ch-08Dh No Specific Usage 8bit Rec Write LPC and DMA. Read only
08Eh DMA
08Fh DMA C4 Low Page 8bit Rec Upper addr bits [23:16]. See comment at 080h.
090h-091h No Specific Usage --- ---
092h Port A 8bit Yes
If kel_porta_en is enabled, then access Port A;
else access LPC.
093h-09Fh No Specific Usage --- ---
0A0h PIC Slave - Command/Status 8bit Shw$
0A1h PIC Slave - Command/Status 8bit Shw$
0A2h-0BFh No Specific Usage 8bit ---
0C0h Master DMA Address - Channel 4 8bit Yes 16bit values in two transfers.
0C1h No Specific Usage 8bit ---
0C2h Master DMA Counter - Channel 4 8bit Yes 16bit values in two transfers.
0C3h No Specific Usage 8bit ---
0C4h Master DMA Address - Channel 5 8bit Yes 16bit values in two transfers.
0C6h Master DMA Counter - Channel 5 8bit Yes 16bit values in two transfers.
0C7h No Specific Usage 8bit ---
0C8h Master DMA Address - Channel 6 8bit Yes 16bit values in two transfers.
0CAh Master DMA Counter - Channel 6 8bit Yes 16bit values in two transfers.
0CBh No Specific Usage 8bit ---
Continued…