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We now come to the connection switching required for the different EPROM types. The table below shows the pin-outs for the 6 types of EPROM this unit will program. 2716 and 2732 are 24 pin devices and fit into pins 3 to 26 of the EPROM socket, the pin-outs shown below relate to the socket, not the device.

** = No Pin
NC = No Connection
PP+ = Program Pulse, Positive Going
PP- = Program Pulse, Negative Going
OE = Output Enable (Active Low)
CE = Chip Enable (Active Low)
VPP = Programming Voltage
VCC = Supply Voltage
GND = Ground (0V)

It can be seen from the above that most of the pins are the same for all devices. Only 6 pins require special attention, these are 1, 20, 22, 23, 26 and 27, and are marked with a "#" next to the pin number.