gregf |
Ramtek's Trivia promoter
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Reged: 09/21/03
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more Eeekk! goodness
#384144 - 11/01/19 01:44 PM
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Re: more Eeekk! goodness
[Re: gregf]
#384145 - 11/01/19 04:17 PM
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> If only, former MAMEdev (Pac-Man > hardware extraordinaire) dwidel were around since that > hardware was his thing.
While I greatly appreciate all that Dave did for the project, I was disappointed that, despite my entreaties for a group bid, he and the other MAME-friendly devotees of rare games on Pac-Man hardware all competed against each other rather than pool their resources when a PCB of this type came up for auction back in ~2003. One of the Japanese collectors ended up winning that board and it vanished into the typical black hole.
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gregf |
Ramtek's Trivia promoter
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Reged: 09/21/03
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Posts: 8632
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Loc: southern CA, US
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Re: more Eeekk! goodness
[Re: MrGoodwraith]
#384148 - 11/01/19 11:26 PM
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>> If only, former MAMEdev (Pac-Man hardware extraordinaire) dwidel were around since that >> hardware was his thing.
>While I greatly appreciate all that Dave did for the project, I was disappointed that, >despite my entreaties for a group bid, he and the other MAME-friendly devotees of rare >games on Pac-Man hardware all competed against each other rather than pool their >resources when a PCB of this type came up for auction back in ~2003.
I remember that thread on Gridle's old MAME.net web site. I don't remember exact year when that happened, but I figure you have that episode memorized in what year it took place since it was one of those of the 'ones that got away'. ;-)
I was viewing that as a minor 'bump' in the road and the game would eventually be found, but I didn't expect it to be another 10 plus years going by before that game was eventually found and supported.
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Re: more Eeekk! goodness
[Re: gregf]
#384149 - 11/02/19 12:40 AM
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I will note here that the Tristar 8000 hardware employs one of the lamest protections against ROM swaps ever devised. Basically each game's program code starts by reading the coin port and then locking up the CPU if bits 7 and 6 fail to match a constant value. This presumably is implemented by bridging the two corresponding input buffer pins to GND or Vcc; if so, it can be defeated with trivial wire mods.
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Re: more Eeekk! goodness
[Re: AJR Hacker]
#384167 - 11/03/19 01:32 PM
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> I will note here that the Tristar 8000 hardware employs one of the lamest protections > against ROM swaps ever devised. Basically each game's program code starts by reading > the coin port and then locking up the CPU if bits 7 and 6 fail to match a constant > value. This presumably is implemented by bridging the two corresponding input buffer > pins to GND or Vcc; if so, it can be defeated with trivial wire mods.
I notice the driver was marked as imperfect colours? IIRC the colours on this are PROM based, are we sure it isn't just a bad PROM?
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gregf |
Ramtek's Trivia promoter
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Posts: 8632
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Re: more Eeekk! goodness
[Re: Haze]
#384189 - 11/06/19 09:26 AM
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>I notice the driver was marked as imperfect colours? IIRC the colours on this are PROM >based, are we sure it isn't just a bad PROM?
Assuming the fix is complete...
- epos.cpp: Redumped color BPROM for Eeekk! correcting colors. [Andrew Welburn]
https://github.com/mamedev/mame/commit/994fc674d6146201451d43d055f3e567fbd3122b -
other stuff from the source src/mame/drivers/epos.cpp
Epos Corporation IGMO and their other game Catapult still yet to be fixed, but hopefully respective pcbs and roms can be found and redumped in the future.
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