Dragon 32 Sound Extension Module

From The Dragon Archive
Revision as of 14:55, 17 August 2015 by Jedie (talk | contribs) (Category:Documentation Category:Hardware)
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)

The Dragon 32 Sound Extension Module is a cartridge by J.C.B. (Microsystems), that contains a General Instruments AY-3-8910 sound chip (Also found on Amstrad CPC, Spectrum 128, +2 and +3, MSX, Atari ST and other machines).

This allows the Dragon to play interesting sound effects and complex chiptunes without taking all processor time.

The cartridge also adds two 8-bit I/O ports (provided also by the AY-3-8910).

The sound chip can be operated via the new commands in BASIC provided in the cartridge ROM, or via the 0xFEFE and 0xFEFF addresses.



Dragon32 SoundExtensionModule ROM Message.png

IC Parts Lists

IC list (with Datasheets)

Part Number Description Datasheet
2732 4Kb EPROM (pdf)
AY-3-8910 Programmable Sound Generator (pdf)
SN74LS04N Hex inverters (pdf)
SN74LS08N Quadruple 2-Input Positive-AND Gates (pdf)
SN74LS27 Triple 3-Input NOR Gate (pdf)
SN74LS30 8-input Positive NAND Gate (pdf)
SN74LS138 Decoder/ Demultiplexer (pdf)


  • Version 1
  • Version 2