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HFDC-II

AUVA COMPUTER, INC.

HFDC-II

Data bus:

16-bit ISA

Size:

Three-quarter length, full-height card

Hard drive supported:

Two MFM ST-506/412 drives

Floppy drives supported:

Two 360KB, 720KB, 1.2MB, or 1.44MB drives

CONNECTIONS

Function

Location

4-pin connector - drive active LED

J1

20-pin data cable connector - drive 1

J2

20-pin data cable connector - drive 0

J3

34-pin control cable connector - hard drive

J4

34-pin control cable connector - floppy drive

J5

USER CONFIGURABLE SETTINGS

Function

Location

Setting

 

LED always "on" when system on

W1/1

open

 

LED "on" only when drive is being accessed

W1/1

closed

Four byte ECC enabled

W1/2

open

 

Reserved - do not use

W1/2

closed

 

Cache enabled

W1/3

open

 

Cache disabled

W1/3

closed

 

Interleave ratio is 1:1

W1/4

open

 

Maximum interleave ratio is 1:3

W1/4

closed

 

Floppy drive primary address is 3F2-3F7h

W2

open

 

Floppy drive secondary address is 372-377h

W2

closed

Note: Close W1/4 when using disks formatted under the WD1003-WAH controller.

USER CONFIGURABLE SETTINGS CONTINUED

Function

Location

Setting

Hard drive primary address is 1F0-1F7h

W3

open

Hard drive secondary address is 170-177h

W3

closed

Floppy drive single speed enabled

W4

open

Floppy drive dual speed enabled

W4

closed