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'Problems with custom made programmer'
1999\11\22@160516 by Kyle Stemen

I am trying to make my own programmer for the PIC16CXX series. I have
gotten to
successfully work with the PIC16C74A, but it does not work at all with
the PIC16C64. My
programmer interfaces through the parallel port. My VPP is very close to
13 volts.

What could the problem be? All of my timing is extra slow. Is there a
limit to how long I can
wait? The specifications do not mention any limit. Does VPP have to
first stay around 5V
before it goes up to 13V? What kind of voltages are needed for a logic 1
and 0 on the data
and clock lines? When the PIC is outputting data how much current can it
sink or source? Is it
ok if I keep the power on most of the time, even when VPP is not on?
What differences could
the be for programming between the PIC16C64 and the PIC16C74A? I have
checked both chips
with the official programmer and they both work

1999\11\22@161758 by Robin Abbott


I assume that you are using the EEPROM programming algorithm with the C84?

Robin Abbott -

* NEW from FED - WIZPIC - visual PIC development
*     - see web site for more details !
* Forest Electronic Developments

{Original Message removed}

1999\11\22@190536 by Kyle Stemen

I'm not sure what is that algorithm? I got my algorithms from
Programming Spcifications for PIC16C6X/7X/9XX OTP MCUs (30228h.pdf).

Robin Abbott wrote:
{Quote hidden}

> {Original Message removed}

1999\11\23@034924 by Dr. Imre Bartfai


is it a Tait-style programmer? (Schematic may be found amongst others at
B. Dobaj's home page)


On Mon, 22 Nov 1999, Kyle Stemen wrote:

{Quote hidden}

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