Merged M92 PAL entry

 PAL Updates  Comments Off on Merged M92 PAL entry
Apr 022016
 

We had two separate files for M92-b-2l.
One was just labelled for M92 hardware and the other was for Ninja Baseball Batman.
I deleted the entry for M92 as the Ninja Baseball Batman dump was from an actual unlocked PAL chip.

End user will not notice any difference, this update is to keep a record of what has been done and when.

 Posted by at 4:46 pm

Reading Irem MASKROM’s

 General, Technical Info  Comments Off on Reading Irem MASKROM’s
Apr 022016
 

I got an M92 PCB here that uses MASKROM’s from SHARP.
These MASK’s in particular are pin compatible for either 27C020, 27C040 or 27C080 EPROM’s.
It is possible to determine which to dump these as from the markings on the chip. They all begin with the ID LH53#, where # is the identifier of the size.
“LH532” = 27C020 dump
020

“LH534” = 27C040 dump
040

“LH538” = 27C080 dump
080

The remaining letters/numbers of the markings are unique to the game and location on the PCB.

 Posted by at 10:55 am