Talk:MMC3 pinout

Pinout with chip rotated 45°

No offense but the pinout with the chip rotated 45° by Lidnariq in july 2012 looks awful in my personal opinion. (How could it go unnoticed by me for 6 years ?!) Bregalad (talk) 05:55, 5 October 2018 (MDT)

The alternatives all look worse to me.—Lidnariq (talk) 10:46, 5 October 2018 (MDT)

PRG RAM /CE and PRG RAM +CE

How PRG RAM +CE works? Is it just inverted PRG RAM /CE? Or it's controlled via the $A001 register while PRG RAM /CE is low when $6000-$7FFF addressed? Cluster (talk) 19:03, 8 August 2021 (UTC)

I am pretty sure (but not confirmed) +CE is being controlled by $A001 bits 6 and 7, and /CE is being controlled by the CPU address bus range $6000-7FFF. (/ROMSEL, A14, A13 = 1,1,1) Ben Boldt (talk) 19:08, 8 August 2021 (UTC)

Furrtek's reverse-engineered schematic from the die shots of the ULA [1] show that pin is just /RD... but I checked on an MMC3A and MMC3B and pin 30 connects to RAM pin 20 - -CE; and RAM pin 22 is grounded. —Lidnariq (talk) 04:43, 22 August 2021 (UTC)