Today we have some new PAL dumps.
Andrew Ivanov sent in dumps from Mortal Kombat and Mortal Kombat II Midway T-Unit boards.Dump from Mortal Kombat is proven to be working also on NBA Jam board.Thanks to him for this contribution.
I dumped the PAL from an original Elevator Action PCB.Device (a PAL16L8) is marked ‘WW15’ and located @IC24 and should be present on all games that run on Taito SJ system (Jungle Hunt, Alpine Ski, Front Line to name few)
Today we have some new PAL dumps.
Ace’ sent it dump of the PAL from a Data East Burnin’ Rubber PCB.Device was a PAL10L8CN reversed using an ABI Boardmaster 4000.Thanks to him.
We have also dump of the PAL @1A from the Japanese revisions of Final Fight.This actually comes from MAME and was uploaded some time ago on Dumping Union list(there are also other PAL dumps on this list which I will progressively insert into our database)
Both dumps have been successfully tested on GAL16V8 targeting device.
Today I dumped the two PALs from a Gaiapolis (single board PCB revision).Now we have dumps from both PCB versions as this game come salso in a two boards revision which share only a PAL (the one marked ‘055996’ @8G) while the other one (marked ‘056469’ @22G and already in database) has slightly different equations from the one I dumped today ( which is marked ‘056469A’).Dumps have been successfully tested onto GAL16V8 targeting devices.
More than a repair a quick fix.
I got this Dangun Feveron PCB :
The owner said that most of sprites were scrambled and I could confirm the issue upon powered up the board:
Sprites data are stored into two 42 pin 32Mbit MASK ROMs @U25-U26:
When I went to probe them I noticed a broken jumper @JP3:
Checking with a multimeter the connections of this jumper relevealed that point ‘2’ was connected to pin 32 of the two MASKs ROMs, therefore the higher address line A20.So, signal coming from point ‘3’ was not reaching this pin due this broken jumper and this caused the sprites issue.Once restored it:
all came back to normality.End of job.
Received this Batsugun Special Ver. PCB for a repair:
Game played fine but colors were all dull and washed-out, take a look at this comparison with a MAME snapshot on the left:
or this video:
This was a clear sign of some troubles in colors palette circuitry.After studying the hardware, I was able to locate this section by shortcircuting some address/data lines of two CXK5816 SRAMs @U39 and U40 and at the same time observing color changes on screen:
Besides the two mentioned SRAMs, you can see some 74LS245 and two 74HC273 involved in data bus (the first ones in exchanging data from/to the two RAMs, the latter in latching).When I went to probe the two 74HC273 I found that input pin 13 of the one @U43 was stuck low and its corresponding output pin 12 showed only weak signals:
So confident I went to remove it:
When I tested it out-of-circuit it failed:
Once fitted a good IC and powered up again the board, the game played great with no further issues.
End of job.