This is microcontroller chip commonly found on clones till post pentium packaged in 40 pin DIP. After that, non-legacy and embedded 8042's in chipsets in newer boards and later. Right now I need the pin info where clock goes into that 8042 so I could bypass current clock source. Motherboard's clock generator is sick. Most of it is partially working, which is very common on one brand chipmaker. !! Do it by injecting 8042 directly with crystal xtal or use 4 pin oscillator ic. Need Mhz as well, 12Mhz? Search on 'net gave nothing and Intel had EOL'ed that 8042 2 years ago. >:-P Also I'll have to inject 24mhz into the SMC super i/o ic as well, already knew can find datasheet for that. I have seen partial working clock generators more than once in one or two brands chip generator and think this is quality issues. Cheers, Wizard