From old-computers:
"
YouTubeplease help
trying to convert 8bit video for sam coupe
this is still not mode 3 interlaced with hmpr bit 5$6 CLUT alterations per scan line HELP we only need a DMA...
masterdos/basic atom lite support HELP"
Possible translation:
"
YouTubeplease help.
I am trying to convert 8bit video for sam coupe.
If you use mode 3 interlace and set bit 5&6 of "hmpr" register, and do CLUT alterations per scan line this could be possible and make a good result. But I need help to make this possible..
Could we use a hardware DMA to make this a reality?
Can anyone help me to use masterdos or atom lite interface (not atom lite+)?"
atom lite is a cf/ide interface for sam. advanced version is called "atom lite+". So "basic atom lite" is the less advanced version.
CLUT is "colour look up table". It means modifying the palette registers, changing the colour for a pen.
mode 3 on sam is 512x192 linear framebuffer, 2 bits per pixel (4 colours).
"All modes are paletted, with a 16-entry
CLUT selecting from a palette of 128 colours. "
hmpr is "high memory page register".
bit 5 and bit 6 control part of the colour look up register addressing, "only available in mode 3".
It is not garbage and not machine generated.
it's ramblings, it's deep understanding of the sam hardware which we lack.
all he's saying, is, "using this mode, and changing the colours over the screen we could achieve close to a 256 colour mode", it may not be possible without hooking up a DMA to write changes more quickly.
When he puts HELP on the end of a line, it is not clear to me if he is asking for help, OR he is saying "I can help here".
Look on youtube, it's got a video he made showing part of this idea already working.
Roger is a real person!
