Epson PX-8 Technical Manual page 80

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Figures 2-59 and 2-60 show the timing relationship among major clock signals.
9.8M
4.9M
2.45M
6303 pin 3
- EXTAL
6303 pin 40
f - - - - - -......
E
6303 pin 39
AS
2.45M
MRQ
M1
RD
RF
about 100 nsec.
Fig. 2-59
Fig. 2-60
2-56
REV.-A