Hp Vectra VL400 Manuale Utente Scaricare il pdf (Pagina 48)

4 BIOS Overview

BIOS Addresses

DMA Channel Controllers

Only “I/O-to-memory” and “memory-to-I/O” transfers are allowed.

“I/O-to-I/O” and “memory-to-memory” transfers are disallowed by the

hardware configuration.

The system controller supports seven DMA channels, each with a page

summarizes how the DMA channels are allocated.

DMA controller

Channel Function

0Free

1 Free if not used for parallel port in Setup

2 Floppy disk controller

3 Free if not used for parallel port in Setup

4 Used to cascade DMA channels 0-3

5Free

6Free

7Free

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Hp Vectra VL400 Manuale Utente Pagina 48