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Catalogue of Arcade Emulation Software - the Absolute Reference

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cloud9.c

0.35b12 [Mike Balfour]


NOTES:

- Hardware: Prototype variant of the Centipede/Millipede hardware with some significant deviations.

- Cloud9: This hardware is very similar to Crystal Castles. The primary difference is the lack of banked ROM and the mapping of the bitmap layer into the lower 20k instead of the lower 32k. In order to do this, they split the bitmap into two banks. Bank 0 holds pixels 0,1,4,5,... while bank 1 holds pixels 2,3,6,7,... This is all handled transparently by bitmode. The lower 24 lines of video RAM are used for working RAM. This amounts to $600 bytes at $0000. In order to provide more work RAM, the write protect logic selects bank 1 for accesses to VRAM at $4000, so the other $600 bytes can be accessed there. Only Firebeast seems to use this RAM.


WIP:

- 29th November 1999: Zsolt Vasvari fixed 16bpp in cloud9.

- 0.35b12: Added cloud9.c driver.

- 23rd April 1999: Mike Balfour sent in a driver for Cloud9 prototype.