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(3) CPU Pin Functions
The CPU has total of 64 pins and an 14.746MHz clock. It controls a 256KB ROM, 32KB RAM, 32KB optional
RAM, and an optional interface board. These RAMs are used as an input buffer, line buffer, bit image buffer,
and download area. The CPU pin functions are as follows.
14.746MHz Clock ————_>
Address Bus <j
Address/Data Bus <=>
Address Latch #————
3.7 MHz «<——_—_-
OHTRG «——__—
EHTRG *———_
CRTRG <«———
Interrupt 0 —__*
Interrupt 2 ————>
TxD*
RxD ————+
DTR «———_
Buzzer <————_
Friction/FF
SW__
sy
Color Ribbon Sensor
CPU
—->
Color Motor Enable
.
=
Color Motor 4 Phases
ALE
—————» EEPROM DI/0
——— + EEPROM CLK
OSC (X1,2)
A8-A20
ADO-AD7
T04
———+»
OE (for ROM, RAM, GA)
T01
——>
WE
4
SUPER QUIET/TEAR
OFF/LOAD PARK
INT2
+
Color Module Sensor
INTO
TxD
RxD
P34
P26
AN1
Sere
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