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konami/simpsons.cpp
ID Category [?] Severity [?] Reproducibility Date Submitted Last Update
01168 Speed Minor Have not tried Feb 12, 2008, 08:01 Oct 13, 2019, 18:46
Tester Bugfinder View Status Public Platform
Assigned To Kold666 Resolution Fixed OS
Status [?] Resolved Driver
konami/simpsons.cpp
Version 0.57 Fixed in Version 0.122u6 Build
Fixed in Git Commit Github Pull Request #
Summary 01168: simpsons: The game slows down a bit as if the original hardware wasn't powerful enough for it.
Description The game slows down a bit as if the original hardware wasn't powerful enough for it. Playing you can see the background doesn't move in sync with the rest of the game.
In the source there is:

CPU_KONAMI, 3000000, /* ? */

So the original coder wasn't sure about correct speed. If you overclock CPU 0 to 125%, it plays nicely.

PCB Information by Kold666 (0.122u5): I have measured clocks on simpsons pcb.
There is 24mhz xtal and pin 18 of the konami cpu gives 12mhz.
pin 17 gives 3mhz but I think the right clock is 12mhz since for a single cpu 90's game like Simspons 3mhz is too slow.

I'll submit a diff changing cpu to 12mhz with a comment of the findings

RB: The Konami-1 CPU is a 6809. Those do not run 12 MHz, *ever*. 3 MHz is more than sufficient for a low-sprite-count Final Fight clone. Didn't you ever play games on the C64? 1 MHz is a lot more than Intel and AMD (and Microsoft) want you to think :-)
Steps To Reproduce
Additional Information
Github Commit
Flags Verified with Original
Regression Version
Affected Sets / Systems simpsons
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No.17080
MetalGod
Senior Tester
Oct 13, 2019, 12:48
 It seems this issue was fixed right after kold666 informed about the pcb clocks

From whatsnew.txt:
0.122u6
Verified and changed cpu frequencies and oki m6295 pin 7 on the
following pcbs: Asuka&Asuka, Cadash, Equites h/w games and sound
board, F1GP, Super Formula, Gladiator, Ping Pong king, Great
Swordsman, Irem m52 sound board, Tropical Angel, Explosive Breakers,
Magical Crystal, Mad Gear, Roller Aces, Chinese Hero, Simpsons,
Golfing Greats, Time Pilot 84. [Corrado Tomaselli]