On 2020-07-03 13:24, Johnny Billquist wrote:
Oh, and just for the people who don't want to read a lot of
documentation, the smooth scrolling is essentially done by the terminal
by changing where the source of the video signal generation picks up
font information, so that you actually start scanning at a specific line
of the font definition for characters at the video generation stage. And
then you do additional trickery so that you start scanning the next line
data as well, so that compared to the line above, this line is generated
using data from two lines, and your picking up font definition lines
with offsets, and then you need a bit of special casing for the first
and last lines of the region.
I hope that made sense... :-)
And to take this one step further. Emulation of this then means you need
to start emulation the video signal generation. And that in turn means
you are going to do emulation of the CRT phosphor. The video memory is
not at all involved in this whole feature/function.
Does MAME emulation the video signal generation? I thought it didn't.
But then again, MAME do support games that use vector graphics, where it
obviously do need to emulate things at this level, so it definitely
could do it...
Johnny
--
Johnny Billquist || "I'm on a bus
|| on a psychedelic trip
email: b...@softjar.se || Reading murder books
pdp is alive! || tryin' to stay hip" - B. Idol
_______________________________________________
Simh mailing list
Simh@trailing-edge.com
http://mailman.trailing-edge.com/mailman/listinfo/simh