Why do people keep stealing my work :(

der Mouse wrote: I think I mentioned it before, but I reverse-engineered the Asteroids Digital Vector Generator (FYI - Tempest uses an Analog Vector Generator instead). Ended up finding out what instruction opcode 0x0 *really* does - MAME's been mis-emulating that for years :) For those who actually care, it's a DRAW instruction with a scale factor of 512. It's really only good for drawing single pixels and very (and I mean *very*) short lines. The two Atari Vector Generators rank pretty high on my list of cool hacks. Some of the tricks used to squeeze additional I/O lines out of the 4-bit state machine PROM were pretty neat, and the circuitry itself was a pig to trace, even with the schematic. I've got a Verilog version that I need to look into programming into a CPLD to play with, but first I need to get my homebrew X-Y display working again... -- Phil. | Kitsune: Acorn RiscPC SA202 64M+6G ViewFinder philpem at dsl.pipex.com | Cheetah: Athlon64 3200+ A8VDeluxeV2 512M+100G http://www.philpem.me.uk/ | Tiger: Toshiba SatPro4600 Celeron700 256M+40G