Hi guys,
I built a programmer(software in TurboC/DOS) with a single octal latch used on an bi-directional LPT port.It reads the signature bits perfectly.erases the chip perfectly.
When i write some data it writes (gives correct data polling) but when i read the programmed sample data it gives mismatched add/data sometimes and correct add/data othertimes...
What could be wrong ?
Tested the circuit independenltly , seems perfectly fine....
I built a programmer(software in TurboC/DOS) with a single octal latch used on an bi-directional LPT port.It reads the signature bits perfectly.erases the chip perfectly.
When i write some data it writes (gives correct data polling) but when i read the programmed sample data it gives mismatched add/data sometimes and correct add/data othertimes...
What could be wrong ?
Tested the circuit independenltly , seems perfectly fine....