- corrects a latent overflow error in the CRT that was visible via the new Metal back-end as a diagonal scan on top of the display running from bottom left to top right for machines with a coloured border and specific sync timing (in practice: the Master System, ColecoVision and MSX); and
- makes a couple of negligible improvements to 6522 timer emulation, potentially benefitting the Vic-20 and Oric.
The latter stems from having uncorked a new set of VIA tests; more accuracy improvements are likely to be forthcoming in that area.