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.

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