Sharp MZ-5500 Tehnical Manual

11) When accessing the 1/0 port of the AY·3-8912
(2) When initializing the lOA port, write the data to be
sound le), load rIo register address into 231 H, then
output (described above), then place the port in the
wr ite the 1/0 da ta to 230H.
output mode. This is needed to maintain the SE land
MOTOR ON signals inactive during initialization .
*1/0 address area shown in the table below may differ between the MZ-5500 and
the MZ-5600.
Table 2 -30.. MI. -5500.
AFTER
INITIAL
OEVICE
AOO
BIT
SIGNAL NAME
1/0
P/O
OEFAULT
PO RT -C 070H
100
WRCT
Oedicated cassette Write signal (No use'
(LS175)
101
MOTOR
Oedicated cassel1e Motor signal (No use'
OUT
Indefinite
102
----------
103
FOCRST
F OC Reset signal (reset when one.)
PO f-H -B
nOH
100
RDCT
Oedicated cassette Read signal (No use)
(LS125)
101
SEr ,J SE
Oedici:!ted casse tte Sense signal (No use)
Input
IN
(0 : SW OFF , 1 : SW ON and C.PU)
mode
102
DIP
SW7
SW7 }
System DIP Switches (See page.l
103
DIP
SW8
SW8
TL\.ble. 2 - 3b MZ -5&00
DEVICE
AOO BIT
Signel name
1/0
After power on
Initialize
100
~
PORT -C
070H
101
~
OUT
Oon't care
(LS74)
102 High Den
MF 0 • 1 M/640K alternate signal
103
FOCRST
FOC reset signal (reset with "1'"
100
~
PORT-B
270H
101
-----
IN
("0" - SW OFF "1" - SW~ON & CPU) Input mode
(LS367)
102
DIP SW7
SW7 }
103
DIP SWS
SW8
System DIP SW (See separate page'

Sharp MZ-5500 Specifications

General

Brand	Sharp
Model	MZ-5500
Category	Desktop
Language	English