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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 ---
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