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S425I ISA

ALPHA RESEARCH CORPORATION

S425I ISA

Data bus:

16-bit, ISA

Size:

Three/quarter-length, full-height card

Hard drive supported:

Four IDE (AT) interface drives

Floppy drives supported:

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

CONNECTIONS

Purpose

Location

IDE drive interface (Primary)

CN1

IDE drive interface (Secondary)

CN2

Floppy drive interface

CN3

Hard Drive activity LED

JP1

Speaker

JP2

USER CONFIGURABLE SETTINGS

Function

Location

Setting

IDE Bus 1 (CN1) resistors open

JDR0

open

 

IDE Bus 1 (CN1) resistors shorted

JDR0

closed

IDE Bus 2 (CN2) resistors open

JDR1

open

 

IDE Bus 2 (CN2) resistors shorted

JDR1

closed

Floppy drive enabled

JP3/jumper 4

closed

 

Floppy drive disabled

JP3/jumper 4

open

Primary hard drive enabled

JP3/jumper 5

closed

 

Secondary hard drive enabled

JP3/jumper 5

open

BIOS ADDRESS CONFIGURATION

Address

JP3/jumper 1

JP3/jumper 2

JP3/jumper 3

DC000-DFFFFh

closed

closed

closed

DC000-DFFFFh

closed

closed

open

D8000-DBFFFh

closed

open

closed

D4000-D7FFFh

closed

open

open

D0000-D3FFFh

open

closed

closed

CC000-CFFFFh

open

closed

open

D8000-CBFFFh

open

open

closed

Disabled

open

open

open

MISCELLANEOUS TECHNICAL NOTES

When using this controller, the system will see the drives attached to each connector as a single drive. i.e.: if you have two 100MB drives attached to CN1 the system will see one 200MB drive. However, if have two drives you would like to be recognize individually, you may attach one to CN1 and the other to CN2.

Closing Jumpers JDR0 and JDR1, which shorts the resistors on the IDE buses, helps to eliminate drive incompatibility caused by different noise filtration methods.

This controller supports 256KB, 1MB, or 4MB fast page mode SIMM's, 80nsec or faster. At least one bank must be filled for proper operation.