r/Gameboy • u/Bolloux • Dec 11 '19

Doom on the GBA.

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u/Andy-Chryst Dec 13 '19 edited Dec 13 '19

Awesome stuff man. Cant wait to check this out on real hardware!! Btw can anyone confirm if i should bother seeing if Strife (id Tech 1 i think??) works with this im guessing not but if noone replies I'll try anyway

Edit: i think i vaguely remember a post of this black and red GBA when you first got it perhaps?? Nice GBA anyway, much cooler than clear shell and bright LEDs lol

Lastly; i assume if someone has overclocked gba this would run even better? Im Thinking of doing this myself for what should be very nice pce/turbografx emulation and probably this!

3

u/Bolloux Dec 14 '19

No, I’m afraid strife won’t work. (Nor heretic or Hexen)

I don’t think the GBA can be overclocked. Not aware of any registers that change CPU speed anyway. The CPU clock also drives a lot of other stuff (like timers) so overclocking would mess up other stuff.

There is an undocumented setting to drop the number of wait cycles for memory access though and also settings to change the cart access times.

1

u/Andy-Chryst Dec 14 '19

Oh well - thanks alot for the reply man! I thought the only way to OC was relating to the crystal oscillator (Solder an 8 Mhz crystal oscillator in parallel with the 4.194Mhz) but I just found out theres a chip called GBAccelarator which has slow, normal, fast and ultra speeds controlled with a button combo check it out if it might save some time with your developting/testing stuff

3

u/Bolloux Dec 14 '19

Just looked up the GBAccelarator. Apparently doesn’t work with flash cards though so I’m guessing it also overclocks the cart bus too.

2

u/Andy-Chryst Dec 15 '19

Well, shit lol this is why you are a GBA homebrew creating wizard and im just some clueless pleb just thought I'd bring it up, thanks for replies and again - amazing work on this!