ZX-MultiSound

Sound card for ZX Spectrum (NemoBus).

Tech specs

• TurboSound FM (2xYM2203)
• General Sound (16MHz, 1024Kb of RAM)
• SAA1099 (use port #FF/#1FF to access SAA chip, write #F7/#FF to #FFFD port to enable/disable SAA)
• SounDrive (ports #0F, #1F, #4F, #5F)
• MIDI synthesizer (controlled via YM(AY) chip - compatible with ZX Spectrum 128K / ZXUNO)
• Low profile PCB: 170x64mm
• 5V and 12V power required
• 4x 1-bit digital DACs for GS and SounDrive

Changelog & current status

• Rev.A - first release. Please note the errata;
• Rev.A1 - fixed known rev.A issues. Please note the errata.
• Rev.A2:
  • Fixed Z80 clocking - added buffer;
  • Fixed 3.5mm jack footprint swapped left-right channels;
  • Fixed misplaced R20 and R34 labels on silkscreen;
  • 74LVC1G125DB replaced by 74AHCT1G125DB;
  • C3,C5,C17,C18 slightly moved left;
  • Added ledge on edge connector;
  • Improved SAM2695 footprint for hand soldering. Sound card has been tested only with ZX Evolution. You can use it with another computer at your own risk.

Related projects

• Turbo Sound FM - link
• ZXM-SoundCard - link
• ZXM-GeneralSound - link
• NeoGS - link