Specifications

MSM800XEV/XEL / Detailed System Description
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I/O Address Function Size R/W Comment
022h-03Fh No specific usage --- ---
040h PIT – System Timer 8bit Shw$
041h PIT – Refresh Timer 8bit Shw$
042h PIT – Speaker Timer 8bit Shw$
043h PIT – Control 8bit Shw$
044h-05Fh No specific usage --- ---
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]. 
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 ---
0CCh Master DMA Address - Channel 7 8bit Yes 16bit values in two transfers.