VRC2 pinout: Difference between revisions
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m (Traced out pins 17 and 39) |
m (... integrate information in http://nesdev.parodius.com/bbs/viewtopic.php?t=8569) |
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The Konami [[VRC2]] and [[VRC4]] chips come in 40-pin DIP packages : | The Konami [[VRC2]] and [[VRC4]] chips come in almost-identical 40-pin DIP packages : | ||
| Line 24: | Line 24: | ||
(n) PRG /CE -> |14 27| -> CHR A15 (r) | (n) PRG /CE -> |14 27| -> CHR A15 (r) | ||
(n) M2 -> |15 26| -> CHR A12 (r) | (n) M2 -> |15 26| -> CHR A12 (r) | ||
VRC4 (r) CHR A18 <- |16 25| -> CHR A14 (r) | |||
VRC4 (n) /IRQ <- |17 24| -> CHR A13 (r) | |||
NC - |18 23| -> CHR A11 (r) | NC - |18 23| -> CHR A11 (r) | ||
VRC4 WRAM /CE <- |19 22| -> CHR A16 (r) | |||
GND - |20 21| -> CHR A10 (r) | GND - |20 21| -> CHR A10 (r) | ||
`----------' | `----------' | ||
On the VRC2, pins 16-19 seem to have been [http://nesdev.parodius.com/bbs/viewtopic.php?t=8569 intended for a never-seen-used EEPROM] | |||
Revision as of 20:09, 27 April 2012
The Konami VRC2 and VRC4 chips come in almost-identical 40-pin DIP packages :
- (s) means this pin is shared between rom, system and NES
- (r) this only connects to the ROM
- (n) means this pin is connected to the NES only
- CHR : these connect to the CHR ROM and/or fami's CHR pins
- PRG : these connect to the PRG ROM and/or fami's PRG pins
.----\/----.
(n) PRG A13 -> |01 40| - +5V
(n) PRG A14 -> |02 39| -> PRG A17 (r)
(s) PRG A1 -> |03 38| -> PRG A15 (r)
(s) PRG A0 -> |04 37| <- PRG A12 (s)
(n) CHR A12 -> |05 36| -> PRG A14 (r)
(n) CHR A11 -> |06 35| -> PRG A13 (r)
(n) CHR A10 -> |07 34| -> PRG A16 (r)
(r) PRG /CE <- |08 33| <- PRG D0 (s)
(n) PRG R/W -> |09 32| <- PRG D1 (s)
(r) CHR /CE <- |10 31| <- PRG D2 (s)
(n) CHR A13 -> |11 30| <- PRG D4 (s)
(n) CHR /OE -> |12 29| <- PRG D3 (s)
(n) CHR A10 -> |13 28| -> CHR A17 (r)
(n) PRG /CE -> |14 27| -> CHR A15 (r)
(n) M2 -> |15 26| -> CHR A12 (r)
VRC4 (r) CHR A18 <- |16 25| -> CHR A14 (r)
VRC4 (n) /IRQ <- |17 24| -> CHR A13 (r)
NC - |18 23| -> CHR A11 (r)
VRC4 WRAM /CE <- |19 22| -> CHR A16 (r)
GND - |20 21| -> CHR A10 (r)
`----------'
On the VRC2, pins 16-19 seem to have been intended for a never-seen-used EEPROM
