From wikipedia. So Astroids used the MOS 6502.
Hardware
Asteroids was implemented on hardware developed by Delman and is a
vector game, in which the graphics are composed of lines drawn on a vector monitor.
[14] Rains initially wanted the game done in
raster graphics, but Logg, experienced in
vector graphics, suggested an XY monitor because the high image quality would permit precise aiming.
[8][10] The hardware is chiefly a
MOS 6502 executing the game program,
[5] and QuadraScan, a high-resolution vector graphics processor developed by Atari and referred to as an "XY display system" and the "Digital Vector Generator (DVG)".
[7][16][17]
The original design concepts for QuadraScan came out of Cyan Engineering, Atari's off-campus research lab in
Grass Valley, California, in 1978. Cyan gave it to Delman, who finished the design and first used it for
Lunar Lander. Logg received Delman's modified board with five buttons, 13 sound effects,
dia
BTW - also tried tempest on PanMame and ditto - works horrible. From a usability perspective I think PanMame has a lot of issues with older games (also lot less compatible)
Tempest works very nice on Mame4all though, bright and sharp.