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Appendix 1-4 Interfaces Rev.A

Confidential

Keyboard/Mouse Port

The 80C42 compatible circuit in the M1543 chip on the mother board contols the data from the

PC keyboard through the 80C31 processor on the POS board. Any mini-DIN type keyboard with

PC/AT compatibility can be connected directly to the keyboard connector

The PS/2 mouse

must be connected with a branch cable. Assignments of signals are shown below. The electric

current capacity of the attached keyboard must be 500mA or less.

A1-5 Keyboard/Mouse connector

There are the following restrictions on the keyboard interface.

❏

EFh

and

F1H

are the key definition commands for the 84 keyboard unit, and a series of data

following those two commands are not sent to the external keyboard. (You may send the

data using PKMODE command.)

❏

Unless 130 or more microseconds elapses after data transmission to the external keyboard,

the data from the keyboard cannot be received. Also, the response from the external

keyboard to the command must be given within 15 milliseconds.

Table A1-3 Assignment of keyboard/mouse port pin assignments (VR board CN2)

No. Signal name I/O Description

1 KBDATA I/O Keyboard data signal

2 MSDATA I/O Mouse data signal

3GND-- Ground

4+5V-- +5V of electrical power

5 KBCLK I/O Keyboard clock signal

6 MSCLK I/O Mouse clock signal

KBCLK

IM -> K/B K/B -> IM

KBDATA

Transmitted Data

Receive Data

1 2 ... 153 154 155 156 157 158 159 160 161 162 163 ... 191 192

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