Epson FX-870

Principles of Operation
E
2
PROM Control Circuit
Figure 6-31 shows the E2PROM control circuit. The E2PROM is non-volatile memory containing
information, such as the top-of-form position. Because the E2PROM is a serial I/O device, the gate
array converts the parallel data (sent fiorn the host computer) into serial data.
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SCL
B5A66YA (IC4) CPU (IC2Cl)
Data Bus
SCK
SDA
SDA
Figure 6-31. EZPROM Control Circuit
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6-30
Epson FX-870/1170