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PXB-721

QUATECH, INC.

PXB-721

Card Type

I/O controller

Chipset/Controller

Intel

I/O Options

8255 I/O ports (3)

Maximum DRAM

N/A

CONNECTIONS

Purpose

Location

Purpose

Location

34-pin 8255 interface 1

H1

34-pin 8255 interface 3

H3

34-pin 8255 interface 2

H2

   

BASE MEMORY ADDRESS SELECT

Address

SW1/1

SW1/2

SW1/3

SW1/4

SW1/5

SW1/6

230h

Off

On

On

On

Off

Off

260h

Off

On

On

Off

Off

On

2E0h

Off

On

Off

Off

Off

On

300h

Off

Off

On

On

On

On

350h

Off

Off

On

Off

On

Off

EXTERNAL INTERRUPT EDGE

Edge

J1

Rising

Pins 1 & 3 closed

Falling

Pins 1 & 2 closed

INTERRUPT SELECT

IRQ

J5/A

J5/B

J5/C

J5/D

J5/E

J5/F

IR/FONT>

Open

Open

Open

Open

Open

Closed

IRQ3

Open

Open

Open

Open

Closed

Open

IRQ4

Open

Open

Open

Closed

Open

Open

IRQ5

Open

Open

Closed

Open

Open

Open

IRQ6

Open

Closed

Open

Open

Open

Open

IRQ7

Closed

Open

Open

Open

Open

Open

PORT 1 INTERRUPT SELECT

IRQ

J2

A

Pins 2 & 3, 4 & 5 closed

B

Pins 1 & 2, 5 & 6 closed

PORT 2 INTERRUPT SELECT

IRQ

J3

A

Pins 2 & 3, 4 & 5 closed

B

Pins 1 & 2, 5 & 6 closed

PORT 3 INTERRUPT SELECT

IRQ

J4

A

Pins 2 & 3, 4 & 5 closed

B

Pins 1 & 2, 5 & 6 closed