Arcade Collecting > Restorations & repair
1981 Ms. Pac-Man restoration
Finalheaven:
Here's a weird question (and possibly a dumb one):
I have the normal speed and fast speed chip for 6F. I have the fast speed chip installed currently. Is there a way to perhaps create some sort of setup that will allow me to toggle between the two chips? I heard of the 4-in-1 chip, but that also includes cheats.
Any thoughts?
SirPeale:
If you want to mess around with the 4-in-1 before doing any installing, it's supported in the latest version of MiSFiT Mame.
Finalheaven:
Is anyone up to speed on hardware speed hacks for the ms. pacman machine, like described here? http://lawnmowerman.rotheblog.com/#speedUpsHard
When I got my cabinet, I noticed there was a Zoom button installed on the control panel. The wires were cut, but it looked like at one point it had made the game speed up.
Or, perhaps safer for the system, how about piggybacking the 6F chip and installing a switch to toggle between enabling either output pin? Any advice there? I may go with this option since I already have the chips for 6F and some spare sockets. All I would need is the switch and a wiring scheme.
Does anyone know the OE pin for the 6F chip? Thanks.
Finalheaven:
So I created this thing. Using jumpers, I basically connected all but two pins of each 24pin Eprom in parallel. There are three sockets on the other side: one socket for the ribbon cable, one socket for the fast chip, and one socket for the normal speed chip. Pins 18 and 20, the OE pins according to the Ms. Pacman schematics, are connected to a DPDT switch (you can see the backside of the switch at the top right of the picture). The idea is to switch between the fast chip and the original speed chip via the switch. I know of the hack Eprom but I didn't want invincibility on my chip or a simple speed up for Ms. Pacman.
I connected the switch and when I turn on Ms. Pacman, I get an image of random colored numbers and letters with an orange here and a pretzel there. I still have some kinks to work out. I've checked that none of the wires have snapped (already three have and I had to resolder them. 30 gauge wire is a effing pain). I used a multi-meter to continuity test the pins and sockets and switch. Everything checked out. I'm going to test for shorts now and test the pins on the end of the flat ribbon cable with the pins on the eproms, right at the shoulders.
http://www.dragonhooker.com/images/pacman/eprom_switch.JPG
RayB:
I think the way I have seen it done is to piggy-back the chips, and bend a couple specific legs up (maybe the ones that take power?) and you link those to a switch (2 or 3 position switch depending on how many chips you wish to support).
This is all fuzzy memory of how I *think* my Galaga's fast shoot chip is set up. Think about it, no soldering of dozens of little wires!!
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