Casio CTK-573 - Quick Reference Guide; Basic Keyboard Operation; Playing Built-in Tunes

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MAJOR WAVEFORMS
3 MNI signal
JE connector pin 1
4 APO signal
JC connector pin 12
1 Clock signal for CPU
LSI4 pin 15
2 Clock signal for CPU
LSI4 pin 16
5 Key common signal KC0
JB connector pin 1
6 Key common signal KC1
JB connector pin 2
7 CE signal for ROM
LSI3 LH536PYE pin 12
8 CE signal for working RAM
LSI1 TC55257DFL pin 20
9
@
9 Sound signal (L)
JF connector pin 3
@ Sound signal (R)
JF connector pin 4
Tone : Grand Piano
Volume : Maximum
Touch speed : Maximum
Key : A4
2
5
6
1
3
4
7
8