prog prob

[muddy0409]

Hi all, I am having a funny (strange, not ha ha) programming prob with some NEW but old stock 16C715 chips.

I have a program, using only PORTB to drive an LCD. This works fine on a 'F84 but when I try to put it in a 'C715 nothing happens.
I am using IC-PROG into an Australian MicroByte Development board that has not shown any problems with any other chips. I have tried some other "flash LED" type simple progs too BTW.

When the "blown" chip is read, it comes up with either all 3FFF's (normal, new chip) or ALL 0000's. Absolutely nothing shows up as being programmed in.

I HAVE read the spec sheet for the 'C715 but cannot decipher anything peculiar to these chips which would indicate some special features.

IC-PROG has a 16C715 in its list of chips, so I would have assumed that it should be able to do all required to program them.

I have seen some other programmers that DO NOT have the 'C715 in their list of chips, so does that indicate that there is something funny about these??

Thank you all.
Peter Moritz
ADELAIDE Souith Australia.