Configuration Data; Dma Channels; Input/Output Addresses - Intergraph InterServe 800 System Reference Manual

Configuration Data

DMA Channels

The system board uses Direct Memory Address (DMA) channels to exchange data without
accessing the CPU. Some channels are assigned for specific use by the system, as defined
below. Each DMA channel appropriates full 32-bit processing. For an ISA bus, channels 0
through 3 are 8-bit and channels 4 through 7 are 16-bit channels.
DMA Assignment
0 LPT
1 Spare
2 Floppy Controller
3 Spare

Input/Output Addresses

The following table lists a small subset of the reserved I/O addresses.
Address
0278 - 027F
02E8 - 02EF
02F8 - 02FF
0378 - 037F
03B0 - 03BF
03C0 - 03CF
03D0 - 03DF
03F0 - 03F7
03F8 - 03FF
DMA
4
5
6
7
Device
Parallel Port LPT2
Serial Port COM4
Serial Port COM2
Parallel Port LPT1
Monochrome Display/Printer Adapter
Enhanced Graphics Adapter (EGA/VGA)
Color/Graphics Monitor Adapter (CGA/MCGA)
Floppy Controller
Serial Port COM1
Assignment
Cascade input for 0-3
Spare
Spare
Spare
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