Very interesting! It's not like the other Rockwell VIA replacements where a diode is needed on the IRQ pin? I think in that case it was due to the IRQ being open collector output.
"The W65C22N and older NMOS and CMOS IRQB output is/was open drain pull down only. The W65C22S IRQB should be logically ORed to reduce power and increase speed or wired ORed with other devices using a diode that is forward biased when IRQB is low"
... yes, I need to clean my screen! 🤣
Very interesting! It's not like the other Rockwell VIA replacements where a diode is needed on the IRQ pin? I think in that case it was due to the IRQ being open collector output.
"The W65C22N and older NMOS and CMOS IRQB output is/was open drain pull down only. The W65C22S IRQB should be logically ORed to reduce power and increase speed or wired ORed with other devices using a diode that is forward biased when IRQB is low"
cpu made by commodores...MOS technology INC
it's a 65sc12