If that works even if the levels are not a typical ttl level, I think that will be a risk to make a random result with other Orics in the case you wanted to do a serial production. About my project I rather add a level converter buffer to be sure that all computers will work with the interface.
This is the right place to discuss on how to implement hardware vsync, adding a VIA or AY chipset, puting multiple roms, or how to design a new flash expansion card.
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