ΟΛΟΚΛΗΡΩΜΕΝΟ ΚΥΚΛΩΜΑ 28C256-15

EEPROM chips have come in. (CAT28C256)

Now that we have a low frequency adjustable clock source and a single-stepping instruction interface to the Z80 processor we can test EEPROM chips after they have been programmed. Most every EEPROM chip consists of a certain amount of data and address lines as well as control lines for reading, writing, and enabling the chip. The reading and enable control signals are used by the Z80 for data retrieval from the EEPROM. The enable and writing lines are used to program the EEPROM.