beautypg.com

2. main cpu and i/o port – Sharp MZ-3500 User Manual

Page 14

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

background image

3-2. Main CPU and I/O port

MZ3500

A2

YO

AS

B

M

A4

Yi

A

1

A5

Y2

N

A6

G2A

Y3

A7

C

P

lORQ

G2B

Y4

u

u

Y5

¥T

G1

YG

Y7

74 LS138

This paragraph discusses main CPU I/O

Connector

port select and addressing.

I

FC2

The

address

output

from

the

main

CPU

I

is decoded in the 74LSI38 to create the

I

select signal.

I Table below describes address map and

[ signal functions.

SKDC

O lOSF

I

L©

'MTR

!

MFUC

I

I

ijD lOMF^

lOABCMEMORY MAPPER)

- IT -