HP Vectra Technical Reference Manual page 391

Table D.2
Adapter 1/0 Map
I/O Address Description
1FO-1 F3H Hard Disc controller
200-207H Game
I/O
adapter
278-27FH Parallel port 2
2E8-2EFH Serial port 3
2F8-2FFH Serial port 2
300-307H
Prototype adapter card
320-323H Reserved
378-37FH Parallel port 1
380-38FH
SDLC, bisynch 2
3AO-3AFH Bisynch 1
3BO-3B7H Monochrome display adapter
3BC-3BFH Monochrome display/Parallel adapter
3DO-3DFH Color Graphics adapter
3E8-3EFH Serial port 4
3FO-3F7H Flexible Disc controller
3F8-3FFH Serial port 1
0.1 OMA Channel Controller
The SPU supports seven DMA channels using two Intel 8237A DMA controllers in cascade mode.
For each DMA channel there is a page register used to extend the addressing range of the
channel to 16 MS. The only type of DMA transfer allowed is
"1/0
to memory". No
"1/0
to I/O" or
"memory to memory" transfers are allowed due to the way the hardware is configured. For
more detailed information on the 8237A DMA controllers see Intel's The 8086 Fami/y User's
Manual.
Table D.3 summarizes how the DMA channels are allocated.
382 I/O Port Map