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MODEL 21

GSI, INC.

MODEL 21

Data bus:

16-bit, ISA

Size:

Half-length, half-height card

Hard drive supported:

Two IDE (AT) Interface drives

Floppy drives supported:

Four 360KB, 720KB, 1.2MB, 1.44MB, or 2.88MB drives

CONNECTIONS

Function

Location

34-pin control cable connector - regular/2.88MB floppy drive

J2

34-pin control cable connector - regular floppy drive

J3

5-pin connector - DC power

J5

40-pin IDE(AT) Interface connector

J6

4-pin connector - Drive active LED

J8

BIOS ADDRESS

Settings for Model 21 with Part # 1533-21-04-3 or earlier

 

Address

J4/jumper 1

J4/jumper 2

 

C800-C9FFh

pins 1 & 2 closed

pins 1 & 2 closed

D800-D9FFh

pins 2 & 3 closed

pins 1 & 2 closed

 

DC00-DDFFh

pins 2 & 3 closed

pins 2 & 3 closed

 

E000-E1FFh

pins 1 & 2 closed

pins 2 & 3 closed

Note: On Model 21 with Part # 1533-21-03-6 or earlier address D000-D1FFh is selected instead of E000-E1FFh.

BIOS ADDRESS

Settings for Model 21 with Part # 1533-21-06-8 or later

 

Address

J4/jumper 3

J4/jumper 4

 

C800-C9FFh

pins 1 & 2 closed

pins 1 & 2 closed

D000-D1FFh

pins 1 & 2 closed

pins 2 & 3 closed

 

D800-D9FFh

pins 2 & 3 closed

pins 1 & 2 closed

 

E000-E1FFh

pins 2 & 3 closed

pins 2 & 3 closed

Note: On Model 21 with Part # 1533-21-05-0 address E400-E5FFh is selected instead of E000-E1FFh.

MISCELLANEOUS TECHNICAL NOTES

On Model 21 with Part # 1533-21-06-8 or later J4/jumper 2 is factory configured to pins 2 & 3 closed - do not alter.

J4/jumper 1 is not used on Model 21 with Part # 1533-21-06-8 or later.

J4/jumper 3 and J4/jumper 4 are not used on Model 21 with Part # 1533-21-04-3 or earlier.