hello forum,
presently i am using philips isp,and switching to asim khan's programmer,i have built the programmer,everything is fine,but the problem is it gives me verify error,i have checked the hardware twice,no probllem the voltages are proper,one thing i would like to say is i have used 74LS 299 instead of 74HC299 for which i have placed an heat sink on 7805.plz help.

regards
nafis