KBD42W11 View Datasheet(PDF) - SMSC -> Microchip

Part Name

Description

Manufacturer

KBD42W11

Keyboard Controller

SMSC -> Microchip 

The following figures show bit definitions for the input, output, and test-input ports.

(A) Input Port Definitions

BIT

FUNCTION

0

Undefined

1

Undefined

2

Undefined

3

Undefined

4

RAM on System Board

0: Disable 2nd 256 KB of System Board RAM

1: Enable 2nd 256 KB of System Board RAM

5

Manufacturing Jumper Installed

0: Manufacturing Jumper

1: Jumper Not Installed

6

Display Type Switch

0: Primary Display Attached to Color/graphics

0: Primary Display Attached to Monochrome

7

Keyboard Inhibit Switch

0: Keyboard Inhibited

1: Keyboard Not Inhibited

(B) Output Port Definitions

BIT

FUNCTION

0

System Reset

1

Gate A20

2

Undefined

3

Undefined

4

Output Buffer Full

5

Input Buffer Empty

6

Keyboard Clock (Output)

7

Keyboard Data (Output)

(C) Test-Input Definitions

BIT

FUNCTION

0

Keyboard Clock (Input)

1

Keyboard Data (Input)

11

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