In article <15280.9803051259@afs.mcc.ac.uk>, David Tait writes >My "UPP" design is what I use for my own development work with >EPROM-based devices. It can program all baseline and midrange >PICs but I only supply software for the 16C54/55/56/57. I don't >supply anything for the others because I can't guarantee the >programming pulse timing shown in Microchip's programming specs (I >don't know how the others do it) although in practice it doesn't >seem to be a problem. No PCB either. I am considering writing software to program 16C6X/7X. Please can you explain which particular pulse timing specifications cause the problem? -- Nigel Broad