Demon Development Cartridge
The Demon Development Cartridge was an addon from John Morrison.
From his publicity :
The ultimate machine code tool.
Suitable for 464/664 and 6128 machines.
Demon will give you a full control of your Amstrad.
Stop any program, any time by a press of a buttom.
The memory remains intact and can be :
- Saved to Tape/Disc. - Debugged. - Traced. - Moved. - Disassembled. - Etc.
Now, thanks to Jose Leandro, the hardware specialist of the spectrum, with his famous page :
We can know more about this hardware.