tasmail / eprom_programmer

Yet another EPROM programmer.

Simple EPROM programmer

This programmer is based on MCUDude Arduino Major/Mighty Core and can program 2716, 27C16, 2764, 27C64, 27128, 27C128, 27256, 27C256 chips.

Features

• Upload and download data over 5V UART in Intel HEX format.

• Small count of components.

• Based on wide range of cheap microcontrollers.

Schematic

Compatible microcontrollers are all https://github.com/MCUdude/MajorCore and https://github.com/MCUdude/MightyCore (standard pinout) ATmegas.

Tested with 12MHz crystal.

You can find example schematic that uses ATmega8515 in kicad folder:

Usage

1. Connect device to PC over any UART converter @ 57600 baud.

2. In your serial communication program (minicom) press inserted chip code (w/o Enter):

"a" - 27C16,

"b" - 27C64,

"c" - 27C128,

"d" - 27C256.

If you want to program 2716, 2764, 27128 or 27256 press "N" and limit char tx delay to 100 ms (Ctrl-A T F in minicom).

3. Modes:

• For erase verify press "f": if all bytes are 0xFF - chip is clear.
• For dump the chip press "r" and copy HEX to .hex file (or Ctrl-A L in minicom after step 2).
• For write press "w", check Vpp (correct it before w/o chip) and paste HEX file content .
• For verify press "v" and paste HEX file content (or Ctrl-A S "ascii" in minicom).

Possible error messages:

• Bad HEX : error on HEX reception.
• Bad 0xXXXX : count of unsucsessful write attemts in 0xXXX0 block =10 and last "bad" byte is 0xXXXX (or first mismatch in verify mode).
• Huge HEX : HEX record must be no more than 16 bytes of HEX data.
• UNK REC TYPE : unknown HEX record type.
• CHKSUM ERR @ XXXX : HEX checksum error.
• TOO HIGH ADDR : address of HEX record last byte out of selected chip memory space.

See also

• This projest is based on https://github.com/walhi/arduino_eprom27_programmer
• 27C512 programmer @ http://kovlev.ru/tools.html
• objcopy (GNU tool, part of Arduino IDE as avr-objcopy) - convert from binary to ihex and vice-versa.