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PICList Thread
'DIY-117 Programmer'
1999\02\18@194436 by Donald Brown

picon face
Hi piclister's,

I recently purchased the DIY kit-117 for programming all available pic
chips.

The kit went together nicely and worked on the first try with a
pic16f84. So I purchased (2) pic16c74b-JW's from digi-key and tried
one of them in the programmer. First option I tried was a blank check.
Response was CHIP NOT BLANK. So I did a read. All program memory is 00
and both lock bits are set !!! So I did a UV erase. Same results. Well
bad chip maybe, so I tried the other "new" chip. Exact same results.

So my dilemma is:

1. Did the programmer just blow (2) $13.00 Chips :-(
2. Is the programmer not correctly reading the chips :-)
3. Poor luck and got 2 bad chips.. Unlikely

The ini file does not specify the "B" series, however a previous
piclist mail indicates they are same as far as programming. Also spec
sheets indicate they should be ok to program same as "A" series.

This could be a devastating experience for many picsters at $13-$15 a
pop.

I would appreciate any help and information from those with prior
experience.

Thanks in advance
Don

_________________________________________________________
DO YOU YAHOO!?
Get your free @yahoo.com address at http://mail.yahoo.com

1999\02\19@023115 by Jim Robertson

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face
At 16:42 18/02/99 -0800, you wrote:

Hi Don,

Sorry for the rushed reply, I'm cramming to get though all the "urgent"
emails/distress signals.

{Quote hidden}

I think this is the problem.

>3. Poor luck and got 2 bad chips.. Unlikely

No way.

>The ini file does not specify the "B" series, however a previous
>piclist mail indicates they are same as far as programming. Also spec
>sheets indicate they should be ok to program same as "A" series.

I stated that the 16C74B could be programmed as a 16C74A and I have
just checked the programming specs again to confirm this. There is
nothing in document DS30228H to indicate that there is a single
difference so I stand by what I said.

I would hate to be responsible for this problem. One time I had a
user of one of my programmers program the code protection on the
16C73A parts even after I had posted so much information warning
people.

He went ballistic and blamed me and Don McKenzie so much that Don
decided that we had to replace his 17C73A parts. I didn't want to
but Don didn't want to loss a customer so I had to go along.

>This could be a devastating experience for many picsters at $13-$15 a
>pop.
>
>I would appreciate any help and information from those with prior
>experience.

Many things could cause all 0's to be read back. I have seen it many
times with my tinkering. Maybe you have a construction mistake in the
VPP or VDD switching for this part. It is different than that for the
16F84. Check your construction again. Just because the 16F84 works
don't think all the other parts will.

I doubt your parts are code protected. They should be alright once you
sort out the problem.

Jim


>Thanks in advance
>Don
>
>_________________________________________________________
>DO YOU YAHOO!?
>Get your free @yahoo.com address at http://mail.yahoo.com
>
________________________________________
Jim Robertson
Email: spam_OUTnewfoundTakeThisOuTspampipeline.com.au
http://www.pipeline.com.au/users/newfound
MPLAB compatible PIC programmers and firmware
upgrades for many programmers.
________________________________________

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