I have successfully built and used the circuit shown in this link for both the 16C84 and the 12C508. It is self powered from the RS232 port. http://www.gbar.dtu.dk/~c888600/newpic.htm I have an epcprox pcb file for it some where if you are interested. regards Stuart. -----Original Message----- From: C. Scott Arnold To: PICLIST@MITVMA.MIT.EDU Date: 03 May 1998 14:52 Subject: Re: Schematics >At 01:23 AM 5/4/1998 +1200, you wrote: >>C. Scott Arnold wrote: >>> >>> Anyone know website with some decents schematics etc. for building your own >>> serial 12C508 programmer? >>> >>> Thank you. >>> >>> Scott. >> >>Scot; >>If you mean serial to the pic but controled from a parallel port then >>check microchip's AN589. >> >>I have my own quickbasic and executables available if you do this. I >>used to run from DOS but now run from win3.11 when picstart+ gives me >>hassles(ie pic16c74). if you have a fast PC you can reduce the program >>time for each location which gives faster erase than the official pgm >>algorithm. >> >>My program includes a cursor selection of *.hex files >> >>a spare printer port comes in handy for low budget logic analyser tasks. >> >>regards, >>Graham Daniel > > >Hi Graham. I checked out a few sites with inof onn the AN589...it doesn't >look like it'll do the 12C508, which is what I want to play with. Actually, >I don't care if it's off the serial port or parallel, as long as it works :) >Have you managed to get the AN589 to program 12C508's ?? > >Thanks. >Scott. >