I thought this was worth discussing separately but in the JAM Assembler conversation earlier today Andrew Gillan provided a link to http://sam.speccy.cz/ , on which one of the documents is http://sam.speccy.cz/coding/hardware_scroll.txt — which alleges that changing the border rapidly between black and white can affect the position of the pixel area within the television frame by a row. Sadly it doesn't bother to explain what aspect of the hardware it thinks is responsible or to provide any real timing information, preferring to talk at great length about how a single pixel hardware scroll would buy you two frames to update the display rather than one if you wanted a scrolling area. It's also weirdly specific to a particular monitor in one place, and I notice that whatever effect it thinks it is relying on doesn't work in Sim Coupe.
Can anyone comment on whether the article documents a real Sam hardware effect rather than merely a perceived effect specific to a particular monitor?
