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FAST DISK VLB

AMERICAN MEGATRENDS, INC.

FAST DISK VLB

Data bus:

32-bit, VL-bus

Size:

Three/quarter-length, full-height card

Hard drive supported:

Up to seven SCSI devices

Floppy drives supported:

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

CONNECTIONS

Function

Location

4-pin connector-Drive active LED

J1

20-pin factory test connector

J2

34-pin control cable connector-floppy drive

J3

50-pin SCSI connector - internal

J4

50-pin SCSI connector - external

J6

USER CONFIGURABLE SETTINGS

Function

Location

Setting

SCSI termination enabled

J8

closed

 

SCSI termination disabled

J8

open

Local Bus speed < 50MHz

J11

pins 2 & 3 closed

 

Local Bus speed > 50MHz

J11

pins 1 & 2 closed

ISA mode enabled

SW1/switch 6

off

 

EISA mode enabled

SW1/switch 6

on

Hard drive capacity > 1GB disabled

SW2/switch 1

off

 

Hard drive capacity > 1GB enabled

SW2/switch 1

on

Cache memory enabled

SW2/switch 2

off

 

Cache memory disabled

SW2/switch 2

on

Single-sector commands separate caching disabled

SW2/switch 3

off

 

Single-sector commands separate caching enabled

SW2/switch 3

on

Caching for removable drives disabled

SW2/switch 4

off

 

Caching for removable drives enabled

SW2/switch 4

on

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Delayed write caching enabled

SW2/switch 5

off

 

Write-through caching enabled

SW2/switch 5

on

SCSI autoselection time-out enabled

SW2/switch 6

off

 

SCSI autoselection time-out disabled

SW2/switch 6

on

SCSI synchronous negotiation enabled

SW3/switch 4

off

 

SCSI synchronous negotiation disabled

SW3/switch 4

on

SCSI 10MB/sec data transfer rate enabled

SW3/switch 5

off

 

SCSI 5MB/sec data transfer rate enabled

SW3/switch 5

on

Adaptec 154x-type target allocation disabled

SW3/switch 6

off

 

Adaptec 154x-type target allocation enabled

SW3/switch 6

on

32-bit operation (Extended Mode) enabled

SW3/switch 7

off

 

32-bit operation (Extended Mode) disabled

SW3/switch 7

on

Support for 7 drives (DOS 5.0 and later) enabled

SW3/switch 8

off

 

Support for 7 drives (DOS 5.0 and later) disabled

SW3/switch 8

on

Floppy drive enabled

SW5/switch 1

on

 

Floppy drive disabled

SW5/switch 1

off

Normal operation enabled

SW5/switch 2

off

 

Diagnostic mode enabled

SW5/switch 2

on

SCSI HOST ADAPTER SLOT NUMBER

Slot Number

SW1/switch 1

SW1/switch 2

SW1/switch 3

1

off

off

off

 

2

on

off

off

 

3

off

on

off

 

4

on

on

off

 

5

off

off

on

 

6

on

off

on

 

7

off

on

on

 

8

on

on

on

MOTHERBOARD SPEED CONFIGURATION

Speed

SW1/switch 4

SW1/switch 5

 

20 or 25MHz

off

off

33 or 40MHz

on

off

 

50MHz

off

on

I/O PORT ADDRESS

Address

SW3/switch 1

SW3/switch 2

SW3/switch 3

 

130-133h

on

off

off

 

134-137h

on

off

on

 

230-233h

off

on

off

 

234-237h

off

on

on

330-333h

off

off

off

 

334-337h

off

off

on

DMA CHANNEL CONFIGURATION

DMA Channel

SW4/switch 1

SW4/switch 2

5

off

off

 

6

on

off

 

7

off

on

 

No Channel selected

on

on

INRTERRUPT REQUEST CONFIGURATION

IRQ

SW4/switch 3

SW4/switch 4

SW4/switch 5

 

9

on

off

off

 

10

off

on

off

11

off

off

off

 

12

on

on

off

 

14

off

off

on

 

15

on

off

on

BIOS ADDRESS

Address

SW4/switch 6

SW4/switch 7

SW4/switch 8

C8000h

off

off

off

 

D8000h

on

off

off

 

D4000h

off

on

off

 

D0000h

on

on

off

 

CC000h

off

off

on

 

DC000h

on

off

on

 

Disabled

off

on

on

 

Disabled

on

on

on

MISCELLANEOUS TECHNICAL NOTES

J5 is factory configured in the closed position - do not alter