[brianpaul]

IIRC, the Atari ROM routines used a different 6-byte BCD floating point format.

[legoxx]

I can assure you that no BCD routines (nor Woz's nor Atari's) were hurt during production of this game. They are really slow. You need to use all kind of tricks and cheats when creating 3d game on 8bit machine and all needed calculations are precalculated in lookup tables.