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Second Reality has always been my favourite demo of all time. I guess the CGA demo is working by very quickly overwriting the display buffer and switching the
by kingcharles 5y ago
Second Reality has always been my favourite demo of all time.
I guess the CGA demo is working by very quickly overwriting the display buffer and switching the palette, using Persistence of Vision. I did the same thing on VGA in 640x480x256 color mode to get 24-bit color in the late 80s.
- thristian 5y agoIt's wilder than that: it hacks up the CGA text mode so instead of drawing all 8 scanlines of each character, it draws the first scanline twice then moves to the next character. Then, it carefully chooses characters, foreground and background colours that (when combined) generate an NTSC composite signal with the required colours in it: https://int10h.org/blog/2015/04/cga-in-1024-colors-new-mode-illustrated/ https://int10h.org/blog/2015/04/cga-in-1024-colors-new-mode-...
- kingcharles 5y agoThanks for the link. As an old INT 10h man myself, this was a great blast from the past.