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Help with 1942 arcade ROM sizes
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d18c7db
Can a kind soul (perhaps someone who has worked on repairs on these boards) please answer a question for me.
I need to know what the deal is with the ROMs on the 1942 video board (I don't have a real board or I'd look at it myself).
The schematic of video board 02A on page 6/8 shows ROMs L1, L2 (labeled as 2764x2) and N1, N2 (also labeled as 2764x2) as having address lines A0..A12 which is normal and expected from 8KB ROMs.
The problem is that all ROM dumps available online such as those used with MAME have these ROM files as 16KB each (which would imply 27128 ROMs)!
So on a real board then, either the ROMs are really 16KB but only half of them are used or the schematic is wrong, in which case, where is the ROM address line A13 (pin 26) connected to?
Cheers
Alex
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