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Serial port eprom programmer9/23/2023 ![]() One half of the socket is for 93Cxx EEPROMs, the other half is for 24Cxx and 24Wxx. The programmer hardware - a DIL16 socket (or two DIL8's), two low-power LEDs, and a few resistors, easily fit into a Cannon 25 connector cover.ĭon't use a metallized cover, if the socket pins run through it. Reasonable values are 470R for the power supply pins (D0 and D5), and 1k5 for the rest of them (D1, D3, D4). It is definitely recommended if you have the LPT integrated on your mainboard. It is an excellent idea to include protective resistors (not shown in the above schematics) to protect the parallel port in case of a defective EEPROM. The schematics and a description is included in the online help. Warning - some parallel ports can't be used this way. Supply voltage +5V is taken directly from the port. It is just a simple software for testing and programming serial EEPROMs using the PC parallel or serial port.
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