mastmees/epromdude

epromdude

Firmware and python code for USBtinyISP attached EPROM programmer. See project page http://www.nomad.ee/micros/eprom/ for hardware description

!!! uncharted waters ahead, this this code is only tested with 27C64 EPROMs this far !!!

firmware implements a command set where each command is

a sequence of 4 bytes

command
address high byte
address low byte
data

the result of last read will be clocked out along with the last data byte the 3rd data byte is status byte

| bit0 | busy |
| bit1 | programming error |

firmware commands

 |RESET		|0	|X	|X	|X 	|
 |READ_STATUS	|1	|X	|X	|X 	|
 |SEEK		|2	|AH	|AL	|X 	|
 |SET_TYPE	|3	|X	|X	|type 	|
 |SET_VPP	|4	|X	|X	|vpp 	|
 |WRITE		|5	|X	|X	|data 	|
 |READ		|6	|X	|X	|X 	|
 |WRITE_INCA	|7	|X	|X	|data 	|
 |READ_INCA	|8	|X	|X	|X 	|
 |SET_LED	|9      |X      |X      | 0=off,1=on