VRC6 pinout

Konami VRC6: 48-pin 0.6" PDIP marked "053328 VRC VI" or "053329 VRC VI" (iNES Mappers 24 and 26)

                 .---\/---.  
         ?GND -> | 01  48 | -- +5V
       AUD D1 <- | 02  47 | -> AUD D0   
       AUD D3 <- | 03  46 | -> AUD D2
       AUD D5 <- | 04  45 | -> AUD D4
 (fr) CPU A12 -> | 05  44 | -> PRG A16 (r)
  (f) CPU A14 -> | 06  43 | <- CPU A13 (f)
       (f) M2 -> | 07  42 | -> PRG A17 (r)
  (r) PRG A14 <- | 08  41 | -> PRG A15 (r)
 (fr) CPU  A1 -> | 09  40 | -> PRG A13 (r)
 (fr) CPU  A0 -> | 10  39 | <- CPU D7 (fr)
 (fr) CPU  D0 -> | 11  38 | <- CPU D6 (fr)
 (fr) CPU  D1 -> | 12  37 | <- CPU D5 (fr)
 (fr) CPU  D2 -> | 13  36 | <- CPU D4 (fr)
  (r) PRG /CE <- | 14  35 | <- CPU D3 (fr)
      (f) R/W -> | 15  34 | <- /ROMSEL (f)
     WRAM /CE <- | 16  33 | -> /IRQ (f)
  (r) CHR /CE <- | 17  32 | -> CIRAM /CE (f)
  (f) PPU /RD -> | 18  31 | <- PPU A10 (f)
 (f) PPU /A13 -> | 19  30 | <- PPU A11 (f)
  (r) CHR A16 <- | 20  29 | <- PPU A12 (f)
  (r) CHR A15 <- | 21  28 | -> CHR A17 (r)
  (r) CHR A12 <- | 22  27 | -> CHR A14 (r)
  (r) CHR A11 <- | 23  26 | -> CHR A13 (r)
          GND -- | 24  25 | -> CHR A10 (r)
                 `--------'
 
 1: conceivably an input instead of a power supply?
 2-4, 45-47: goes to a 6 bit DAC, and then mixed with system audio
 9,10: Swapped between m24 (VRC6a) and m26 (VRC6b), but which is which is not known
 16: passes through a small pulse-shaping network consisting of a resistor, diode, and capacitor.
 32: This is odd: this would only be useful if the VRC6 supported ROM nametables.