What's new

caius

Grand Master
Joined
Nov 21, 2016
Messages
562
Reaction score
834
Location
Italy
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 :

MB112S146_original.jpg


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 :

MB112S146_repro_mod.jpg


Testing was successful on my Arkanoid PCB :

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

Apocalypse

Staff member
Legendary
Joined
Dec 6, 2017
Messages
3,857
Reaction score
6,698
Location
New-Zealand
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

Grand Master
Joined
Nov 21, 2016
Messages
562
Reaction score
834
Location
Italy
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

Staff member
Legendary
Joined
Dec 6, 2017
Messages
3,857
Reaction score
6,698
Location
New-Zealand
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.
 
Top