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I doubt it's a MAME issue, my guess would be a permission error with NABU Internet Adapter. Check what your store folder is set to in the IA settings > RetroNet. Does it have read and write access to the store folder?

Nice patch, thanks.

I added it to the latest Windows build: https://gtamp.com/nabu/nabu-mame.zip

mame.exe uses the V9938/F18A patch
mame-40col.exe for stock NABU TMS9918A

I might change it, not sure which should be the default but I know people will like 80 columns more.

haha yes that should've been my example resolution

mame.exe -window -resolution 1024x768