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MODEL 21 (1533-21-09-1)

GSI, INC.

MODEL 21 (1533-21-09-1)

Card Type

Hard drive controller

Hard Drives supported

Two EIDE drives

Floppy drives supported

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

Data Bus

16-bit ISA

Card Size

Half-length, half-height

   

CONNECTIONS

Function

Label

Function

Label

34-pin secondary floppy connector

J2

40-pin EIDE connector

J6

34-pin primary floppy connector

J3

Drive active LED

J8

Auxiliary power connector

J5

   

Note:J2 supports 2.88MB as well as standard floppy drives. J3 supports only standard floppy drives.

USER CONFIGURABLE SETTINGS

Function

Label

Position

Factory configured - do not alter

J4

Pins 1 & 2 open

Factory configured - do not alter

J4

Pins 2 & 3 open

Primary mode enabled

J4

Pins 5 & 6 closed

 

Secondary mode enabled

J4

Pins 4 & 5 closed

Note:Primary mode selects IRQ 14, I/O address 1F0h & 3F6h for hard drives, IRQ 6, DMA 2, I/O address 3F0h for floppy drives

Secondary mode selects IRQ 15, I/O address 170h & 376h for hard drives, IRQ 6, DMA 2, I/O address 370h for floppy drives.

BIOS ADDRESS SELECTION

Address

J4

C8000h

Pins 7 & 8, 10 & 11 closed

CC000h

Pins 7 & 8, 11 & 12 closed

D0000h

Pins 8 & 9, 10 & 11 closed

E0000h

Pins 8 & 9, 11 & 12 closed