I need help for namco super system 22

LOLAS

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I have a armadillo racing NAMCO super system 22 that has a bad ic on the mrom pcb.
On the ic write AMI PTRL0 and on pcb write PTR-L0.18K (MASK8M).Any idea what part number is this ROM ic and if i can dump it?
I don't think that is m27C160.This ic is sop32 case and i think that is a mask rom ic that i can not dump it.If you have more info about this ic please let me know.
 
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i looked at the boards. 27c160s are in place of MASK32M. so, i think mask8M means 8 Mbit. so might be like 27c080?
 
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