Fujitsu 'MB112S146' reproduction

[caius]

Recently I made a reproduction of the Fujitsu 'MB112S146'.As far as I know this custom IC is used on few Taito arcade PCBs like Arkanoid (which uses two of them), Legend of Kage and Wyvern F-0.It's a DIP28 .600mil chip having the main function of graphics shifter :

Actually we already have a working replacement of the Fujitsu 'MB112S146' designed by 'Porchy' from JAMMArcade, time ago he successfully recreated and implemented the functions of this IC into a CPLD :

Taito MB112S146 custom reproduction

As for me, I reproduced it in a 'poor' way using simple TTL gates instead of programmable logic devices :

Testing was successful on my Arkanoid PCB :

View: https://www.youtube.com/watch?v=CU35yuI1OOA

 

[Apocalypse]

I much prefer your TTL approach if the circuit is simple enough. Because in 20 years from now we're going to need repros of the CPLD repros...

 

[caius]

I much prefer your TTL approach if the circuit is simple enough.

Yes, i think there is no need of programmable logic devices for these small designs, they would be a waste.

Because in 20 years from now we're going to need repros of the CPLD repros...

Hopefuly TTLs will be still available, I can see some manufacturers have stopped their production.But this is a problem for next generations of arcade enthusiasts

 

[Apocalypse]

Hopefuly TTLs will be still available, I can see some manufacturers have stopped their production.But this is a problem for next generations of arcade enthusiasts

I'm not too worried, there are still several dozens of manufacturers making TTL chips. And given their extremely high popularity and longevity I think we should be good for the next 30 years. Then as you said the challenge will be in the hands of the next generation.