VRC7 pinout

Konami VRC7: 48-pin 0.6" PDIP marked: "VRC VII 053982" (canonically iNES Mapper 085)

                .---\/---.
     PPU /RD -> | 01  48 | -- NC
     PPU A13 -> | 02  47 | <- M2
         GND -- | 03  46 | -> WRAM /CS
         R/W -> | 04  45 | <- /ROMSEL
        /IRQ <- | 05  44 | -> PRG /CS
   CIRAM A10 <- | 06  43 | -> Audio Out
      CPU D0 -> | 07  42 | -- +5V
      CPU D1 -> | 08  41 | -> CHR A17
      CPU D2 -> | 09  40 | -> CHR A16
      CPU D3 -> | 10  39 | -> CHR A15
      CPU D4 -> | 11  38 | -> CHR A14
      CPU D5 -> | 12  37 | -> CHR A13
      CPU D6 -> | 13  36 | -> CHR A12
      CPU D7 -> | 14  35 | -> CHR A11
         +5V -- | 15  34 | -> CHR A10
      CPU A5 -> | 16  33 | <- PPU A12
  Crystal X2 -- | 17  32 | <- PPU A11
  Crystal X1 -- | 18  31 | <- PPU A10
      CPU An -> | 19  30 | -- +5V
     PRG A13 <- | 20  29 | <- CPU A14
     PRG A14 <- | 21  28 | <- CPU A13
     PRG A15 <- | 22  27 | <- CPU A12
     PRG A16 <- | 23  26 | -> PRG A18
         GND -- | 24  25 | -> PRG A17
                `--------'
  
  01,02: this doesn't make sense; 
         the VRC7 provides none of hardware nametables, control of CIRAM /CE, or CHR /CE.
         maybe pin 48 is {pin1 OR pin2}, i.e. CHR /CE for a 28-pin CHR ROM?
         then why didn't TTA2 use it?
  17,18: missing on TTA2, 3.58MHz [[wikipedia:Ceramic resonator|ceramic resonator]] on LP
  19: A3 on TTA2, A4 on LP