I/O Map - Gateway ALR 8200 Maintaining And Troubleshooting

102 Maintaining and Troubleshooting the Gateway ALR 8200 Server

I/O map

Address Size
(hex)
0000–000F 16 bytes
0020–0021 2 bytes
0040 1 byte
0041 1 byte
0042 1 byte
0043 1 byte
0048 1 byte
0049 1 byte
004A 1 byte
004B 1 byte
0061-0070 16 bytes
0080-008F 16 bytes
00A0-00A1 2 bytes
00C0-00DE 31 bytes
0400-040F 16 bytes
0461-0464 4 bytes
0480-048F 16 bytes
04C2 1 byte
04C6-04CE 8 bytes
04D0-04DF 16 bytes
04E0-04FF 32 bytes
Description
DMA-1
INT-1
Programmable interval timer 1
Refresh request counter 1
Speaker tone counter 2
Command mode register
Programmable interval timer 2
Reserved
CPU speed control counter 2
Command mode register
NMI status/registers
DMA page registers
INT-2
DMA2
DMA1
Extended NMI control
DMA high page register
Reserved
DMA2
INT/DMA2
DMA