Another WonderBoy bootleg board was laying around on my stash, so it’s time to pick it up and check out what’s wrong with it …Continue reading WonderBoy – Sega – Bootleg
Got this board from a friend of mine for repair, the game is a side scrolling beat’em up released by Konami in 1993.
The board played fine except for a strange graphic issue involving backgrounds and sprites. Sometimes wrong background graphics were displayed:
… sometimes the sprites had bad data and colours:
… sometimes the sprites were missed at all:
Touching and bending the PCB, partially recover or almost changed the graphics, so the issue should be related to bad traces or lifted pins on one or more IC chip in QFP package a very common issue found on Konami boards.
After a quick and dirty investigation i spotted some lifted and bridged pins on the Konami 055555 TQFP IC. The Asic seems to be a
“5-bit-per-pixel priority encoder with 6 inputs. It can do variable alpha blending and probably a few other special graphics tricks that are currently undocumented” (taken from system16.com)
Probably this bad rework is due to a previous repair attempt, cleaning and reflowing the pins resolves all the graphics issues!
Case closed! 🙂
ARiD is an acronym for Arcade Rom ID, is an identification tool used to spot unknown arcade boards from their EPROM dumps.
It also performs checksum calculations for the FLUKE 9010A Micro System TroubleShooter, very useful for repairing vintage computers and arcade boards.
Here’s some data …
Other well known projects:
- Mame … of course!
- Hamster’s Online Rom identification
- Romident – System 16 – The Arcade Museum
- WinROMIdent – Instant Arcade
By the way the above projects seems not to be maintained anymore.
The ARiD engine featuring RoSiCa, works the same way, It calculates the usual hashes for the rom you want to identify and then compare it against the MAME RomSet and its database, obviously if a match is found, it displays all of them.
CLICK ON THE CHIP/LINK ABOVE TO TRY IT OUT