BitBuster depack in VRAM

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By Metalion

Paladin (905)

Metalion's picture

22-02-2008, 16:54

The new sources are online.
I added a readme.txt where everything is explained.

BitBuster_v12_VRAM_depacker_(16Kb)
Pletter_v05b_VRAM_depacker_(16Kb)

By SLotman

Paragon (1188)

SLotman's picture

22-02-2008, 19:50


@SLotman, so you say its ok to do OTIR on Colecovision? Do you know if thats true for all Colecos (i.e. does all have the same VDP) or only on newer ones?

I don't know if all colecos have the same VDP, but by looking at Jungle Hunt and Montezuma's Regenge code, they use and abuse OTIR and INIR - with no problems on the Coleco side...

And to Matelion: Thanks for these! I'll sure put it to good use Smile

By dvik

Prophet (2176)

dvik's picture

22-02-2008, 20:14

I don't know if all colecos have the same VDP, but by looking at Jungle Hunt and Montezuma's Regenge code, they use and abuse OTIR and INIR - with no problems on the Coleco side...

And I suppose they caused problems on MSX? If you do otir in the border area its ok on MSX as well. I read somewhere (need to check this) that Colecovisions VINT happens on the beginning of the display area, not a the end as on MSX. Do you know if this is correct? If it is, maybe the game developers wrote the code so that the otirs occur in the vblank area....

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