‘Konami-1’, a simple name given to a custom IC used on many Konami PCBs from early 80s, here’s a filtered list from MAME :
The chip itself is a 600mil DIP42 which most of times comes with scratched-off part name:
It’s basically a 6809 CPU with some minor modifications (different pinout and scrambled opcodes), it was the first custom chip ever produced by this manufacturer.
Studying how it was reverse-engineered by bootleggers I made my own reproduction of it :
Here’s testing on a Jail Break and Gyruss (bootleg) PCBs:
Probably a CPLD based version will come later in order to semplify the board layout but I’m quite happy with it as is.
It’s big, black and squared.We are talking of the ’85H001′, a custom IC you can find on some arcade PCBs manufactured by Capcom like Ghosts’n Goblins, Legendary Wings, Section Z, Trojan, Gun.Smoke.It looks like a module with audio functions, two versions have been made.A ceramic unmarked one :
And a plastic/epoxydic one marked ’85H001 5H’ or ’85H001 5I’ :
Technically speaking the ’85H001′ can be considered a nearly complete digital sound system, all typical components (CPU, RAM, address decoder, etc.) are embedded into it with the exception of the ROM and synth ICs which are external.Actually the ’85H001′ has been already reproduced by ‘Apocalypse’ who made an excellent thru-hole version :
Having found recently a bootleg of Ghost’n Goblins with a module replacement I decided to make my own reproduction and I made two versions.An ‘hybrid’ one with thru-hole Z80 CPU/RAM and surface mounted ICs :
And a full SMT version with Z84C0006 CPU (PQPF44 package)
Here’s final testing of both on my original Gun.Smoke PCB:
ReproductionsComments Off on Konami ‘501’ reproduction
Apr282019
The Konami ‘501’ is one of the many custom ICs you probaby encountered when dealing with PCBs from this manufacturer.Most of times the chip (28 pin 600 mil DIP package) comes with scratched-off part name, sometimes not like on my Rush’n Attack PCB:
It can be found on not so many PCBs like shown on this useful spreadsheet (credits to ‘mattosborn’ on KLOV forums)
Actually there is already a reproduction of it which uses the ColinD CPLD 28 pin board (based on Altera EPM7064S) of which ‘Porchy’ wrote the code (available here for download).I simply made what I call a ‘poor man’s’ version using simple surface mounted TTLs gates:
Code name : ’86S100′.Nothing really ‘TOP SECRET ‘, just a little custom IC you can find on many Capcom arcade PCBs from pre-CPS1 era.To name few :
1943
Bionic Commando
Black Tiger/Black Dragon
Mad Gear
Rush & Crash/The Speed Rumbler
Side Arms
Street Fighter
The chip is a 28 pin one with plastic package and pitch of 1.778mm :
Sometimes you can find it under different part name but same functions, like on a Mad Gear PCB :
This custom IC is involved in graphics generation being directly connected to data bus of the GFX ROMs as shown on Bionic Commando schematics:
Being a not really reliable part (sometimes you can find it literally ‘fried’) and quite hard to obtain as spare I decided to give a try to reproduce it.As usual I looked at how bootlegers re-engineered it and how the custom functions were implemented in earlier Capcom hardware.I succeeded in my purpose it but I actually had to make two versions of it because the original ’86S100′ can work in two modes depending on the logical state of its pin 1 (if hard-wired to GND or VCC).
Here’s final testing of both reproductions on a Bionic Commando and 1943 PCBs:
PCB Repair LogsComments Off on Teenage Mutant Ninja Turtles repair log
Apr222019
Got for repair from the States this Teenage Mutant Ninja Turtles PCB (actually the US 4 Player ROM set)
Board booted up with noticeable graphical issues, both sprites and backgrounds were affected as they were missing parts.Also colors were wrong, screen was blue tinted (hard to distinguish in the video and pictures though)
The palette circuit is made of two 2k x 8-bit static RAMs, a couple of latches (74LS273), some open collector buffers (74LS07) and finally three ‘052535’ RGB DACs that outputs each color to respective JAMMA edge connector pins :
A blue dominant means the RED color has some troubles so I went to probe around this part of circuit and found the 74LS07 @D23 (from Fujitsu, obviously…) with an output (pin 4) shorted to GROUND :
Chip failed in that pin when tested out-of-circuit:
Replacing the TTL IC restored the correct colors so I moved on the grahical issues.I launched a MASK ROM check which reported two bad devices @K4 and K6:
They are two of the four 4Mbit MASK ROMs that store sprites data:
I removed the first device @K6 :
I dumped it, the resulting buffer of my EPROM programmer was empty so device was really bad :
I launched again a MASK ROM check, the device @K4 was reported as good this time so the bad one @K6 was affecting it (data/address busses are shared)
I replaced the bad MASK ROM with a programmed 4Mbit EPROM (I used a Macronix MX27C4100)
Sprites were restored and check no more complained :
But backgrounds were still missing parts :
This part of graphics is entirely handled by the ‘052109’ and ‘051962’ custom ASICs:
On a visual inspection I found a lifted pin on the latter:
I reflowed the pin and this fixed board completely.Repair accomplished.
