Kaypro 10 - I;O PORT ADDRESSES

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I/O PORT ADDRESSES

Port # Use

and/or

assignment

o

Baud

rate

for

Modem

(Write

only)

Writing

a

number

between

0 and F (hex

-

see

preceding

table)

to

this

port

will

set

the

RS-232C

baud

rate.

4 RS-232C

Modem

Data

(R/W)

Data

register

of

the

Z-80A SIO

5

Keyboard

Data

(R/W)

Eight-bit

data

from

detachable

keyboard.

See

the

following

S-BASIC

program

for

an

example

of

writing

to

this

port.

6 RS-232C

Status

for

Modem

(R/W)

Control/status

port

for

the

Z-80A SIO.

See

Zilog

and

Mostek

Microcomputer

Data

Books.

8

Baud

Rate

for

Serial

Printer

14

System

Port (R/W)

This

port

is

used

for

system

control.

The

various

bits

are

used

for

memory

bank

selection

, di

sk

drive

control

, and

pr

i

nter

hand-

shaking.

18 Parallel Printer Port (Write only) Eight-bit

data

to

parallel

printer

connector

OC

Serial

Printer

Data

(RS-232C)

OE

Serial

Printer

Control/Status

81

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