What is a MB14368?

QuartrArcade

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Going through some Spiders boards that I have had stashed away for years and two are missing IC59, which is a MB14368. Not sure what this, Google search didn't turn up much other than Sigma used them on Spiders boards (what a surprise!).

Anybody know what this is?

Anthony
 
From page 7 of the manual located at http://www.arcade-museum.com/manuals-videogames/S/Spiders.pdf

Screenshot-071912-170700.png
 
Are you sure thats the right number? Nothing comes up on a search....leading me to believe that is a bad number. Do you have a complete working board you can check this on?
 
remember the space invaders bit shifter ic custom is a mb14241

looks like it might be a custom ic for memory bank management....
 
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I'm almost certain the last 3 numbers in the above pic are 368, I can't make out the rest. It does appear to be some sort of memory management IC.
 
hey anthony, could you post some pics (closeups) of the pcb topside and bottom side showing the 6809, the clock crystal and the mb14xxx chip/socket ?

there will be an equivalent circuit for this but would prob need someone with a logic analyser sorta stuff to nut out the logic. deriving the clock signals and the ras/cas and r/w timings wouldnt be too hard.

what memory ics are used in this pcb ?
 
Update from Mark Spaeth: MB14368 is a custom ASIC, as are most of the other MB1xxxx (ie MB14241 on space invaders).

I started to look into reverse engineering one a long long time ago, but decided to work on other projects instead :)

IIRC it's just a clock generator/address decoder, but i don't remember the details -- and the schems on KLOV are too bad a scan to pique my memory.

Anthony
 
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