I dumped a PLD from a working Van-Van Car PCB (manufactured by Sanritsu or Karateco).Device was a unprotected PAL16L2 labeled ‘VAN-83’ @IC79, there are other three PALs on PCB but they are registered and secured.Dump is tested as working in a GAL16V8 targeting device.
Today I dumped the PALs (three secured PAL16L8) from a Sky Wolf PCB (bootleg of Airwolf).Devices are located on CPU board.Dumps have been successfully tested on GAL16V8 targeting devices.
Found two ATF16V8 PLD’s in a Super Nova ROM cartridge. Both were unlocked but have not been verified as my PCB has a fault. The equations look good.
The ROM board is marked ROM-2.
I noticed that Bullet checksums were wrong in the available set. I did a bit of reverse engineering and you can download the fixed version now.
Cheers !
I got two rare boards manufactured by Alpha Denshi for repair : Equites and Splendor Blast
Here’s Equites :
Board played fine except for jailbars on some sprites (look at explosions and first enemies on the ground in the below video):
All the GFX generation circuitry lies on bottom board:
A lor of TTLs were from Fujitsu (especially multiplexers 74LS157 and 74LS153) so I went to check them with my logic comparator.All passed the test except for the 74LS153 @8C:
I desoldered it:
The chip failed when tested out-of-circuit:
I added a socket and a good chip:
No more glitched sprites and board 100% fixed:
Here’s Splendor Blast:
This was a little tricky.When I first powered the board up, watchdog was active, the self-test was failing in all program ROMs and in the ‘ALPHA-8303’ MCU RAM:
Doing a visual inspection of PCB I noticed that one of the two custom SIL marked ‘ALPHA-INPUT84’ was wonky :
It came off in my hands when I touched it:
I powered the board without this component and board successfully passed the self-test so I resoldered it (most likely it was corrupting the main 68000 CPU data bus since some lines are shared with it) :
As I said, the board entered in game but some sprites showed jailbars:
The three sprites ROMs are in bottom board:
I dumped them and they were good.With my multimeter I figured out that address bus was shared among the three EPROMs while data bus was in common only among ROM 5 and 7.But I could not measure continuity between pin 15 (D3) of these two.I removed the devices from sockets and found a severed trace underneath:
Patched it and board 100% fixed.End of job.