ReproductionsComments Off on Konami ‘082’ reproduction
Sep242019
This is my own implementation of the Konami ‘082’ custom IC with the use of simple logic gates.Original part is a 28 pin 600mil IC found on many PCBs of 80’s.As often happens with most of Konami custom ICs it comes with scratched-off part name:
I was able to shrink my board layout to almost same dimensions of original part by using TSSOP devices :
Perhaps not the neatest design, you may call it a ‘poor man’s’ version of the existing CPLD based solution but it works fine and I’m happy with it.Here’s final testing on a Track & Field PCB :
After done it I thought it was good to take into account its “companion” too, the ‘CUS98’ which most times come along with the first.Package is pretty the same but with two further pins than ‘CUS99’
But functions are totally different and, as Rolling Thunder schematics suggest, the main one is to generate the master reset :
Secondary functions are coin counters and lockouts handling as well as lamps driving, it seems only few games (like Pac-Land and Gaplus) use this last feature :
I was obviously interested in reproducing at least the reset generation function which is essential for correct operation of the PCB (but it seems Rolling Thunder can boot into game also with a missing ‘CUS98’).Therefore, as usual, I studied earlier Namco hardware where the custom had not yet been used and I came to a prototype developed on a breadboard:
The protoytpe worked pretty good :
Hence I developed a proper board :
Final testing on a Pac-Land PCB:
As said some functions have been intentionally omitted favoring the needed ones (watchdog circuit ad reset switch were implemented too).This will at least allow to save PCBs with a faulty/broken or missing ‘CUS98’.
ReproductionsComments Off on Irem ‘KNA6032701’ reproduction
Aug112019
Another custom IC successfully reproduced, it’s the Irem ‘KNA6032701’ , a 42 pin DIP 600mil IC used on M62 (Kung-Fu Master, Lode Runner, Spelunker and other), M75 (Vigilante) and M72 (on some type of ‘M72-B-D board) hardware
As usual I reproduced it my way by observing how it was reverse-engineered on bootleg boards obtaining in a board layout with pretty same dimensions of original part :
ReproductionsComments Off on Konami ‘083’ reproduction
Jul262019
This is another ‘poor man’s’ custom IC reproduction I made with no use of CPLD or other complex programmable logics.The part reproduced is the Konami ‘083’, a 28 pin 600mil in DIP package which most of times comes with scratched-off part name :
It can be found on several Konami PCBs, you can refer to this useful spreadsheet (credits to ‘mattosborn’ on KLOV forums)
The ‘CUS99′ (simply silkscreened ’99’) is a custom IC used on Namco arcade PCBs.It’s a 16 pin SIL component covered with a brownish coating :
It can be found on pre-System86 (Pac-land, Sky Kid, Gaplus, Dragon Buster and other boards..), System86 (Rolling Thunder and other games on same PCB layout) and System 1 hardware.From the scarce info about it the ‘CUS99’ is involved in sound volume control but we knew nothing more detailed about, pinout from official schematics apart :
Recently I’ve been sent by the user ‘JorgePT’ a pile of System 1 boards for repair hence, with his permission, I analyzed the part. After drawing schematics of its internal structure I came to the conclusion that the ‘CUS99’ is nothing more than a 4-bit DAC with output level control performed by analog switches.Its design was quite simple and easy to reproduce with few parts :
Testing of the repro on a Pac-Land PCB was successful:
