Firmware

Because I was very curious referring to the screen functions of the JOYCE, I contacted AMSTRAD directly requesting the first informations about the internals of the JOYCE a long time before the magazine „PC-Schneider International" was reporting this issue. These reports („Joyce screen memory", „memory block layout" ( including tools for modifying the character matrix) as well as „CP/M device timeouts") are written by Cliff Lawson.

A very good compilation about the structure of the Joyce may be found here.

Some informations relating the Joyce character set will be found here.

Find here some links to articles referring to the access of the PCW screen memory (a compilation of methodes to calculate the screen address will be found here):

A look inside the Roller RAM	JOYCE Firmware
Joyce screen memory	GSX without secrets
Grafics for the Joyce	Self-made graphics system
Mandelbrot for Pascal	Turbo grafics running on the JOYCE
Superscript - adventure inside the Joyce	Fast Drawline Algorithm
Grafics - without GSX?	Grafics and roller RAM
DOUBLE WIDTH TEXT	DRAWING PACKAGE
Compressing JOYCE screens	Pixels
In the heart of the JOYCE (Part 6: Face-to-face - the screen)