Exerion is a unique driver in that it has idiosyncracies that are straight out of Bizarro World. The sprite-ram, and all the funky parameters that go along with it. The mystery reads from $d802 - timer-based protection? The freakish graphics encoding scheme, which no other MAME-supported game uses. It has been reported that the original did it as well, but this is still uncertain. Sometimes the game resets while you are playing. 0.30: Brad Oliver added 'Exerion' (Jaleco 1983). Known issues: Sometimes the game resets while you are playing. 0.31: John Butler fixed pixel doubled sprites in Exerion. 31st May 1998: J-ROM dumped Exerion (bootleg). 0.33b5: Nicola Salmoria added Exerion (bootleg?). Changed parent description to 'Exerion (Jaleco)'. The game resets when you try to start a game. 0.34b5: Nicola Salmoria added clone Exerion (Taito). 0.34b7: Changed description to 'Exerion'. 0.34b8: Fixed gfx rom and proms loading. 0.35b1: Known issues: Exerion (Taito) resets when you try to start a game. 8th December 1999: Zsolt Vasvari fixed a protection related bug in Exerion. 0.36b12: Zsolt Vasvari bypassed the protection in Exerion. 24th January 2000: Zsolt Vasvari fixed Exerion crash bugs. 25th March 2000: Aaron Giles finally added the background graphics to Exerion, however a few color problems might still remain. 26th March 2000: Aaron Giles added cocktail support to Exerion. 0.37b1: Aaron Giles fixed background in Exerion. 24th September 2001: Dave Widel provided the correct color PROM for Exerion. 15th November 2001: Aaron Giles re-added the correct Exerion color PROM. 0.114u1: Aaron Giles fixed video update in Exerion. 0.115u1: Pierpaolo Prazzoli fixed Exerion ends regardless of # of ships in reserve after the bonus stage, when you die. 0.116: ShimaPong fixed Exerion ends regardless after the bonus stage, when you die. 0.123u1: Changed palettesize to 768 colors. 0.123u4: Zsolt Vasvari fixed sprite colors in Exerion. 0.124: Aaron Giles fixed assertions in Exerion. 0.135u1: Corrado Tomaselli verified/changed clocks and VSync in Exerion. 0.135u2: Fabio Priuli added save state support to Exerion. 0.136u4: Stephane Humbert fixed dipswitches and inputs in Exerion and clones (after verification of the Z80 code). Do - Thanks to Mikonos from Zona Arcade, we have a cleaned-up bezel for Exerion, scanned by Mr.

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