On 1 Feb 2012, at 20:07, Thomas Harte wrote: > 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?
Sounds to me just perceived effect maybe something to do with the fact TVs interlace, but who knows.
