Quote Originally Posted by Squibcakes View Post
Both are connected through 4.7k resistors, as well as the vpp through a 4.7k resistor.


GP0 = GPD = 7
GP1 = GPC = 6

So in your case you would connect the 12Cxxx chip like this:

D-Conn............................uPIC
TXD (3) ------[4.7k]-------VPP(pin 4)

GND (5) --------------------VSS(pin 8)

DTR (4) -------[4.7k]------DATA(pin 7)

CTS (8) ------------------DATA(pin 7)

RTS (7) -------[4.7k]------CLK(pin 6)

5 volts DC to VDD(pin1)

Hope this helps.
J
I've tried to make this programmer but somehow I can't program the 12C508a, here is what happends:

I can read the PIC with no problems in ICprog but when I press the program button it gives me an error on 0000h I've checked the Voltage and I have 5V between GND and VCC as expected (I'm powering the programmer through USB since it gives 5V) and between GND and VPP I have -10V without the PIC placed in the socket ofc...its a bit strange to have a value so low isn't it? Can anyone please help me I'm getting crazy with this already screwed 3 PICS...can read them but cant write Thnx