Vision QD6500

Vision QD6500 is VL-bus IDE controller, used by QDI company in 1993.
Features

one selectable IDE channel

PIO mode 3 without IORDY support

Used in: various controllers, e.g. QD6500A
Manufacturer support: none.
Documentation available: none.
Drivers available: DOS, Win 3.1x

Programming

QD6500 has base address 0x30 or 0xB0 (jumper selectable).
 

base + 0 - R/W timing register

bit 0 to bit 2 - active time, count of VLB clocks
000 = 8 clocks for ID3 = 0, 9 clocks for ID3 = 1
111 = 1 clock for ID3 = 0, 2 clocks for ID3 = 1
bit 3 - 1, R/O
bit 4 to bit 7 - recovery time, count of VLB clocks
0000 = 18 clocks for ID3 = 0, 15 clocks for ID3 = 1
1111 = 3 clocks for ID3 = 0, 0 clocks for ID3 = 1

Power-on-setting: 0x08 for ID3 = 0, 0x0C for ID3 = 1

base + 1 - R/O - config register

bit 0 - IDE controller base address: 0 = 0x170, 1 = 0x1F0
bit 1 - QD chip base address: 0 = 0x30, 1 = 0xB0
bit 2 - ID3, bus speed: 0 = >33 MHz  1 = <=33 MHz
bit 3 - 0 = enabled, 1 = disabled
upper nibble:  1100 is QD6500

DOS Device drivers available:
QD6500 v2.1
QD6500 v2.31
QD6500 v2.4

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updated 21-May-2000 by Petr Soucek