Epson MX-80 Technical Manual page 24

To INT of 8049
(READY)
BUSY
PC1
PCO
OT1-0T8
STROBE
PC2
8155
PBO-PB7 PC4
Head driver
To BUS of 8049 Head driver
Fig. 2.6 Flow of Data and Signals through 8155
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Fig.2.7 8155 and Peripheral Circuits
REV. A 2-12