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2025 Christmas Demo

A project log for Tridora-CPU

a homebrew FPGA CPU with a native Pascal compiler and a simple development environment

sledererslederer 12/26/2025 at 14:570 Comments

The 2025 christmas demo is here.


It uses a recreation of the well-known VGA fire effect, and it required some assembly language routines for a smooth animation. There is also some very simple tile-based animation. I wanted to have some music and sound in the demo but that did not work out. There seems to be a bug in the interrupt mechanism that is triggered when code is executed in DRAM (i.e. with wait states). So I probably have long debugging sessions with the integrated logic analyzer ahead of me. And I should finally draw that big timing diagram.

Merry Christmas and happy holidays everyone!

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