I faced the same problem. In my first few times programming everything seemed ok. When loaded with large code something close to 1k, the programmer always give me error messages. Sometimes able to program but cannot verify correctly. I tried several PCs from Pentium75, Pentium120, Pentium266 to Pentium200. The Pentium75 seems able to do it best, but still quite unsatisfactorily. >>> Mike M 18/10/99, 10:23am >>> Well ive done everything, i used the slowdown program and that didnt give me an error with the verification proccess, and the read process went through i guess..since the chip is blank, but i didnt get any errors just put it like that. HOWEVER, i still cant program anything. I tried adding a seperate 12.10V supply to the reset and swiching it i can not get this thing to work. Has anyone ever actually got this to work than can really help me?? I would just buy a real programmer but im a begginner and dont want to waste a few hundred on something that i may not use on a permenent basis. mike m. On Fri, 15 Oct 1999 23:59:09 +0200 Ernst Aardal wrote: >HI! >You must use the slowdown software that you will find at the same wabpages >as pip and com84. With a 486 and a slow pentium (less than 90MHz) it is ok >without the slowdown software. >Ernst > >John Mullan wrote: > >> Most PC com ports do not supply enough voltage to put the chip into >> programming mode. My AMD K6 333 will not program via my bare bones >> programmer. However, many "Multi-IO" boards with com ports on them do >> work. I put one into my 486 and have no problem programming. the >> programming voltage has to be OVER 12volts. 11.9 will not work well. >> >> Try your programming efforts on a few different computers and you will >> likely find one that works. >> >> John Mullan >> >> -----Original Message----- >> From: Mike M [SMTP:elektrikman@DYNAMITEMAIL.COM] >> Sent: Thursday, October 14, 1999 11:18 PM >> To: PICLIST@MITVMA.MIT.EDU >> Subject: COM84 programer trouble >> >> Hey guys...i built a Com84 programmer, just a direct hookup right to the >> chip and it pulls Vdd programming voltage from the com port...Now, its all >> definitly wired correctly, however i run the com84 drivers, and then start >> PIP-02, and when i hit veryify it says verify failed, and when i try to >> program sometimes the bar goes from 0-100% real slow and i thought it was >> working but when ithit 100% it said write failed. im programing or trying >> to program a 16C84. HELP! I may have posted this message before but i >> never recieved a copy to myself so i assume i addressed it wrong and it >> didnt go through thanks.. >> >> mike m. >> >> Send someone a cool Dynamitemail flashcard greeting!! And get rewarded. >> GO AHEAD! http://cards.dynamitemail.com/index.php3?rid=fc-41 > Send someone a cool Dynamitemail flashcard greeting!! And get rewarded. GO AHEAD! http://cards.dynamitemail.com/index.php3?rid=fc-41