VRC1 pinout
There isn’t a consistent pinout for the VRC1 and its clones; here are two. The pins are mostly in the same order, but power and ground definitely move.
Anything with a ? next to it is uncertain; these pinouts were deduced solely based on images of the PCB.
VRC-1: 28-pin 0.6" DIP (canonically mapper 75)
Labeled “Konami 8626K7 007422 VRC 075” on PCB labeled “Konami 302114A”:
.--\/--.
(r) PRG A15 <- |01 28| -- +5V
(r) PRG A14 <- |02 27| <- CPU A14 (f)
(fr) CPU A12 -> |03 26| <- CPU A13 (f)
(r) PRG A13 <- |04 25| <- PPU A12 (f)
(r) PRG A16 <- |05 24| <- PPU A11 (fr)
(fr) CPU D0 -> |06 23| <- PPU A10 (fr)
(fr) CPU D1 -> |07 22| -> PRG ROM /CE (r)
(fr) CPU D2 -> |08 21| <- R/W (f)
(fr) CPU D3 -> |09 20| -> CHR /CE (r)
(r) CHR A12 <- |10 19| <- PPU A13 (f)
(r) CHR A14 <- |11 18| <- PPU /RD (f)
(r) CHR A13 <- |12 17| -> CIRAM A10?
(r) CHR A15 <- |13 16| <- /ROMSEL (f)
GND -- |14 15| -> CHR A16 (r)
`------'
Labeled “VRC 007421 8805 Z04” on PCB labeled “JALECO-20”:
.--\/--.
(r) PRG A15 <- |01 28| <- CPU A14 (f)
?PRG A14 <- |02 27| <- CPU A13 (f)
?CPU A12 -> |03 26| <- /ROMSEL?
?PRG A13 <- |04 25| <- PPU A12?
(r) PRG A16 <- |05 24| <- PPU A11?
(fr) CPU D0 -> |06 23| <- R/W (f)
GND -- |07 22| -> PRG ROM /CE (r)
(fr) CPU D1 -> |08 21| -- +5V
(fr) CPU D2 -> |09 20| -> CHR /CE?
(fr) CPU D3 -> |10 19| <- PPU A10?
?CHR A12 <- |11 18| <- PPU /RD (f)
(r) CHR A14 <- |12 17| -> CIRAM A10 (f)
?CHR A13 <- |13 16| <- (CPU /ROMSEL OR R/W)?
(r) CHR A15 <- |14 15| -> CHR A16 (r)
`------'
Other part numbers seen include:
- Konami 007506
- (NEC µP)D65005C075 (D65xxx = CMOS gate array; 005 = 1.5µ 320 gates; C = DIP28; 75 = 75th order)