8-bit acorn software: other • GSX under Z80 CP/M

Has anyone ever experimented with GSX under CP/M on the Z80 second processor? I took a quick look at the drivers (DDBBC0.PRL / DDBBC1.PRL) this evening. They seem quite clunky, with not many functions implemented (no filled polygons, no keyboard input), and they're obviously non-optimised compiled code rather than hand-assembled. The result is that they're 12k in size, and the actual output is done by sending OSWRCH commands to the host processor. By comparison, the comparable driver for PCW CP/M (which actually has to write to the framebuffer itself rather than rely on OSWRCH) is a svelte 4k, and the advanced one that does filled polygons is all of 5k.

Is it known if Acorn or Digital Research wrote DDBBC0 / DDBBC1?

Statistics: Posted by JohnElliott — Wed Apr 16, 2025 12:38 am

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