8-bit Battle Royale Tests - Three different TMS9918A display modes

A project log for HBC-56: 65C02 + TMS9918A on a backplane

HBC-56 A homebrew 8-bit computer with a backplane. Initially with a 65C02 CPU card, a TMS9918A VDP and dual AY-3-8910 audio.

troy-schrapelTroy Schrapel 06/04/2022 at 01:585 Comments

Wrote four different output modes for Matt Heffernan's 8-bit (mandelbrot) Battle Royale. Making use of the TMS9918A's Graphics I, Graphics II and Multicolor modes. All tests are run on my 65C02 @ 3.6864MHz. I think the seldom-used Multicolor mode at 64x48 looks alright for this.


Stephen Moody wrote 06/08/2022 at 15:07 point

It looks great. I've got a TMS9918 board for a 68000 computer i've built but other than a few simple tests i've mostly been using the text mode for it. It would be interesting to try something like this to test all the graphics modes on there

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Troy Schrapel wrote 06/15/2022 at 02:10 point

Absolutely. My 65C02 / TMS9918A code is here: . Matt has core 68000 code here: and there is a Sinclair QL example here too:

Would just be a matter of combining them into something for your machine I guess. 

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Stephen Moody wrote 06/15/2022 at 13:08 point

Thanks for the links, will have a look at those.

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Augusto Baffa wrote 06/05/2022 at 21:36 point

Hi Troy,  I've been following your project for some time and your results are really amazing. Congrats!

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Troy Schrapel wrote 06/07/2022 at 02:39 point

Thanks, Augusto. I appreciate it.

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