BEEL1 said:Everything you'll need to design a DIY-programmer is in Cypress Appnote AN2026.
I made one easily using LPT port, with a 74F125, a 74ACT04, a 4-MHz ceramic resonnator and a 7805 regulator (thus no MCU needed ! 8) )
I found that very precise clocking is not necessary (in "excute mode") so the resonnator and the NOT gate can be omitted : the clock can be bit-banged directly from the LPT port.
The only thing which doesn't seem to work with my design is securing the device (it can always be read)... as it's not a problem for me, I haven't tried to find why
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