5B

5B
Developer:	Sunsoft
Released:	1991-??-??
Type:	Chip
Channels:	1.) Square Wave/Noise 2.) Square Wave/Noise 3.) Square Wave/Noise

Sunsoft's 5B chip was an addition to their earlier FME-7 chip, but with additional audio capabilities. While the chip was used in multiple games, the audio capabilities were only used in the game Gimmick! (FC), and even then, they weren't used to their full potential.

The additional audio capabilities come from a YM2149F, which is an improved chip upon AY-3-8910. Games using this chip get 3 additional square waves, each with a shared envelope generator, and 1 additional noise generator.

Pinout

The following ASCII art demonstrates the chip's pinout.

                           / \
                          / O \
           (s) CPU D3 -> /01 44\ <- CPU D2 (s)
        Amplifier in -> /02   43\ <- CPU D4 (s)
      Amplifier out <- /03     42\ <- CPU D1 (s)
            (n) M2 -> /04       41\ <- CPU D5 (s)
      (n) CPU A13 -> /05         40\ <- CPU D0 (s)
             GND -- /06           39\ -- +5V
    (n) CPU A14 -> /07             38\ <- CPU D6 (s)
   (n) /ROMSEL -> /08               37\ <- CPU D7 (s)
  (s) CPU R/W -> /09                 36\ -> PRG A13 (r)
    (n) /IRQ -> /10                   35\ -> PRG A16 (r)
(n) PPU /RD -> /11                     34\ -> PRG A14 (r)
(n) PPU A10 -> \12                     33/ -> PRG A15 (r)
 (n) PPU A11 -> \13                   32/ -> PRG A17 (r)
  (n) PPU A12 -> \14                 31/ -> PRG /CE (r)
   (n) PPU A13 -> \15               30/ -> PRG RAM /CE (w)
    (r) CHR /CE <- \16             29/ -> PRG RAM +CE (w)
             +5V -- \17           28/ -- GND
               NC <- \18         27/ -> Audio out
(rn) CHR/CIRAM A10 <- \19       26/ -> CHR A17 (r)
        (r) CHR A16 <- \20     25/ -> CHR A15 (r)
         (r) CHR A11 <- \21   24/ -> CHR A14 (r)
          (r) CHR A13 <- \22 23/ -> CHR A12 (r)
                          \   /
                           \ /

Image Gallery

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  The Sunsoft 5B chip on a Gimmick! (FC) game board.

Emulation Status

Since it's only used in a single game, few NES emulators properly emulate the 5B, and some others don't emulate all of its features since they're not needed to play Gimmick!.

Links

• wiki.nesdev.com/w/index.php/Sunsoft_5B_audio - Technical information.
• en.wikipedia.org/wiki/Memory_management_controller - Wikipedia.