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Commodore 128 Assembly #28: Programming The 80-column Display (8563 VDC)

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First published at 21:26 UTC on March 7th, 2019.

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aaron-baugher

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Here's a whiteboard tutorial on programming the 80-column screen on the Commodore 128. It's very different from the 40-column VIC display, since you have no direct access to 80-column screen memory and have to program it indirectly by reading and writing to the VDC's registers, which requires a handshaking process through a pair of registers at $D600 and $D601 in the C128's I/O block.

There will be another video soon demonstrating how to use the little routines here to do actual work.

You can find related resources and a link to the code repository for the series here: https://aaron.baugher.biz/pages/6502-assembly-language-programming/

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