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AT BUS + 2S/1P Hard Disk/Floppy Controller Settings and Configuration






UNIDENTIFIED

AT BUS + 2S/1P

Data bus:

16-bit, ISA

Size:

Half-length, full-height card

Hard drive supported:

Two IDE (AT) Interface drives

Floppy drives supported:

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

CONNECTIONS

Function

Location

40-pin IDE(AT) Interface connector

J1

34-pin control cable connector - floppy drive

J2

4-pin connector - Drive active LED

J5

10-pin serial port (COM2/4) - internal

J9

10-pin serial port (COM1/3) - external

J10

25-pin parallel port (LPT1/2) - external

J12

USER CONFIGURABLE SETTINGS

Function

Location

Setting

Single speed floppy drives supported

J3

pins 1 & 2 closed

 

Dual speed floppy drives supported

J3

pins 2 & 3 closed

Floppy drive precompensation enabled

J4

pins 2 & 3 closed

 

Floppy drive precompensation disabled

J4

pins 1 & 2 closed

Chasis ground enabled

J11

closed

 

Chasis ground disabled

J11

open

Serial Port 2 (J9) Interrupt Request IRQ3 enabled

J13/jumper 3

closed

 

Serial Port 2 (J9) Interrupt Request IRQ3 disabled

J13/jumper 3

open

Serial Port 1 (J10) Interrupt Request IRQ4 enabled

J13/jumper 4

closed

 

Serial Port 1 (J10) Interrupt Request IRQ4 disabled

J13/jumper 4

open

BIOS TYPE CONFIGURATION

Type

J6/jumper 1

J6/jumper 2

IBM-compatible BIOS

open

closed

 

IBM BIOS

closed

open

SERIAL PORT 1 (J10) CONFIGURATION

COM

J7/jumper 1

J7/jumper 3

1

closed

open

 

3

open

closed

SERIAL PORT 2 (J9) CONFIGURATION

COM

J7/jumper 2

J7/jumper 4

2

closed

open

 

4

open

closed

PARALLEL PORT (J12) CONFIGURATION

LPT

J7/jumper 5

J7/jumper 6

1

open

closed

 

2

closed

open

 

Disabled

open

open

FLOPPY DRIVE CONFIGURATION

Function

J8/jumper 1

J8/jumper 2

Floppy drive port address is 3F0-3F7h

closed

open

 

Floppy drive port address is 370-377h

open

closed

 

Floppy drive disabled

open

open

PARALLEL PORT (J12) INTERRUPT REQUEST

IRQ

J13/jumper 1

J13/jumper 2

 

5

closed

open

7

open

closed








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