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mmc3 chr rom wiring
Posted: Sat Apr 26, 2008 5:43 am
by coinheaven
are there numerous ways to wire the chr rom on mmc3 repros? most of the time i use the guide on this site, but sometimes i get garbled graphics. all the pins are soldered and everything looks fine. i have been looking through old posts and it seems some people wire the pin 1 to pin 32. is this necessary? any other pins that could be wired to fix the graphics?
Posted: Sat Apr 26, 2008 6:05 am
by Bregalad
No there is only one correct way to wire the chip, at least when it comes to data/adress pins.
When it comes to useless pins such as VPP, /PGM or such things wire them to VCC (pin 32) and you should be fine. If you get scrambled graphics you most likely did something wrong with the adress/data/control pins.
Posted: Sat Apr 26, 2008 7:40 am
by coinheaven
Bregalad wrote:No there is only one correct way to wire the chip, at least when it comes to data/adress pins.
When it comes to useless pins such as VPP, /PGM or such things wire them to VCC (pin 32) and you should be fine. If you get scrambled graphics you most likely did something wrong with the adress/data/control pins.
cool. what pins #'s are VPP / PGM?