b2
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Incomplete I/O regions?
CRTC and Video ULA occupy 4 bytes each, for all BBC Micro types. This might stem from doing initial tests on a Master?
Test on a B as well. Looks like both devices should occupy all addresses in their respective areas.
https://stardot.org.uk/forums/viewtopic.php?f=4&t=17839&p=247029#p247029