Thank you,
so it appears the change in the encryption modules means the ROM format changes
a big help was the mame -verifyroms options, which clearly spelled out the missing prom files that did not appear in my ZIPs
it also made it easy to search and find the correct versions using the prom file names
I downloaded some new roms and they work !!
another posted just posted a possible conversion tool I will look at next
Thank you to both of you !!
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