Stunt Car Racer - BBC Master - Little Ramp WIP

Stunt Car Racer by Geoff Crammond
Being ported from C64 to BBC Master by KieranHJ
Work in progress video of The Little Ramp track captured on real hardware at 50Hz
The game runs ~12.5Hz in MODE 4 currently (no colour or sound yet)
More info can be found at stardot.org.uk...

[@dw1664]

Excellent!

[@RakkuAmiya]

Absolutely incredible. Love the dust effect when you go off-road.

[@AlastairMontgomery]

Great work

[@olynxmano]

Nice work. One question: The C64 version is build on character movement, and also filling parts (the sky) by changing character attributes. Is that adopted into the BBC version, or did you find a more suitable solution for the BBC?

[@kieranhj]

The BBC doesn't have a character attribute mode so the sky is filled by filling the screen pixels directly (so 8x bytes required per character.) Fortunately the BBC Micro has a faster 6502 CPU so we have enough time to do this (along with plotting the sprites in software and everything else that has to be done manually without the mighty VIC-II chip.) You can see the final results in the other video on my channel. More technical info on the Stardot forum and happy to answer questions at greater length there.

[@olynxmano]

Thanks.

[@simonscott1121]

Where'd you get the disassembly of the 64 version? Im about to embark on disassembling it myself, might be nice if someone could shortcut that process for me :D

[@kieranhj]

Hey! I started with a RAM dump of the C64 version and put that through a disassembler, I can’t remember which one. I also cross referenced with the source for the Atari 8-bit version which Fandal provided me. All the BBC sources and reference materials are in this GitHub repo: github.com/kieranhj/scr-beeb