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travrusa.c

0.30 [Lee Taylor, John Clegg]


TODO:

- shtrider dipswitches

- Accurate frequency, measured on a Moon Patrol board, is 56.75Hz. The Lode Runner manual (similar but different hardware) talks about 55Hz and 1790ms vblank duration.


NOTES:

- I haven't understood how char/sprite priority works. This is used for tunnels. I hacked it just by making the two needed colors opaque. They don't seem to be used anywhere else. Even if it looks like a hack, it might really be how the hardware works - see also notes regarding Kung Fu Master at the beginning of m62.c.

- shtrider has some weird colors (pink cars, green "Seibu" truck, 'no' on hiscore table) but there's no reason to think there's something wrong with the driver.


VIDEO HARDWARE NOTES:

- Traverse USA has one 256x8 character palette PROM (some versions have two 256x4), one 32x8 sprite palette PROM, and one 256x4 sprite color lookup table PROM. I don't know for sure how the palette PROMs are connected to the RGB output, but it's probably something like this; note that RED and BLUE are swapped wrt the usual configuration.


WIP:

- 0.30: Added travrusa.c driver.