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(n) SOUND   <- |01      48| -  CHR A14  (r) 
(r)  CHR A13<- |02      47| -  CHR A15  (r) 
(r)  CHR A12<- |03      46| -> CHR A16  (r) 
(r)  CHR A11<- |04      45| <- CHR A17  (r) 
(s) CHR A10 -> |05      44| -> CHR A18  (r) (Not sure about this as it could be a special enable for CHR RAM instead, NC on my board)
        GND  - |06      43| -> +5v 
(r) PRG A18 <- |07      42| -> CIRAM /CE(n) 
(r) PRG A17 <- |08      41| -> CHRROM/CE(r) 
(r) PRG A16 <- |09      40| <-  WRAM /CE(w) (Megami Tensei II working fine with 6264 /CE connected to this pin)
(r) PRG A15 <- |10      39| <- /IRQ     (n) 
(r) PRG A14 <- |11      38| <- CHR A10  (n) 
(r) PRG A13 <- |12      37| <- CHR A11  (n) 
(s)  PRG D7<-> |13      36| -> CHR A12  (n) 
(s)  PRG D6<-> |14      35| -> CHR A13  (n) 
(s)  PRG D5<-> |15      34| -> GND 
(s)  PRG D4<-> |16      33| -> GND 
(s)  PRG D3<-> |17      32| -> +5V           (This is used to power the waveform RAM. Can be used as backup memory if connected to a battery)
(s)  PRG D2<-> |18      31| -  GND
(s)  +5v    -  |19      30| -> M2       (n) 
(s)  PRG D1<-> |20      29| -> PRG R/W  (s) 
(s)  PRG D0<-> |21      28| -> PRG /CE  (n) 
       GND  -  |22      27| -> PRG A14  (n) 
(r) PRG /CE -> |23      26| -> PRG A13  (n) 
(s) PRG A11 -> |24      25| -> PRG A12  (s) 
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