ZX Spectrum 128k core for Turbo Chameleon 64

This is a port of the MiST ZX Spectrum 128k core to the Turbo Chameleon 64 cartridge

This is an experimental core, and while I do my utmost to make sure it works for everyone and will try to help solve any problems that arise, you run this core entirely at your own risk.

If you’d like to show your appreciation for this core, or motivate me to work on this and other cores in future, donations are welcome at https://paypal.me/robinsonb5 or https://patreon.com/coresforchameleon. Anyone donating £20 or more via PayPal or sponsoring on Patreon at the second tier will be thanked by name in a “Core Supporters” shout-out page in subsequent releases.

Please note: it’s vitally important that you download the correct version of the core for your Chameleon.

ZXSpectrum 128 for Chameleon V1 hardware: If you have a single mini-DIN socket on the left hand side of your Chameleon, to which a breakout cable attaches for the keyboard and mouse, then you have V1 hardware and need this version:

ZX Spectrum 128 for Chameleon V2 hardware:  If you have three mini-DIN sockets on the left-hand side, with the keyboard and mouse plugging in directly, you have V2 hardware, and need this version:

Currently supported:

  • Floppy disk images
  • Cassette images
  • Snapshot files
  • C64 keyboard / joystick
  • CDTV joypad


The core requires a ROM file in the root of the SD card, called SPECTRUM.ROM An example ROM file can be found at https://github.com/mist-devel/mist-binaries/tree/master/cores/spectrum


The Spectrum keyboard is emulated via both the PS/2 keyboard, and the C64 keyboard. Please note that some keys might be inaccessible via the C64 keyboard.

Other keys:

FunctionPS/2 keyboardC64 keyboardCDTV controller
MenuF12Run/Stop + <-Power
(Un)Pause TapeF1F1 or Run/Stop-1
Tape RewindF2F2 or Run/Stop-2
Tape ForwardF3F3 or Run/Stop-3
Turbo offF4F4 or Run/Stop-4
Turbo x2 – x16F5 – F8F5 – F8 or Run/Stop-5 – 8
Snapshot menuF10Run/Stop-0
Multiface 128R-Shift F10
Warm resetF11
Cold resetAlt-F11

Hold the menu button for 1 second or longer to toggle the scandoubler on or off.

Source code for this core can be found at https://github.com/robinsonb5/ZX_Spectrum-128K_MIST

This core is ported from the MiST ZX Spectrum 128k core, which was written by Alexey Melnikov, building upon previous work by Till Harbaum and others, and with subsequent improvements and maintenance by Gyorgy Szombathelyi.

The Turbo Chameleon 64 port wraps the MiST core in a compatibility layer (DeMiSTify, by Alastair M. Robinson), and makes very few material changes to the core itself.