Started by redbox, 16:00, 06 March 11
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Quote from: Devilmarkus on 18:28, 06 March 11It's also 16k screen ram but you can theoretically keep 2 screen contents in the same ram area and toggle them by byte shifting.For more info, ask Kevin Thacker.He did a little mode 3 test program, where you can toggle between 2 screens.
Quote from: Devilmarkus on 19:48, 06 March 11Use space key to toggle images
Quote from: redbox on 21:12, 06 March 11I was hoping Mode 3 gave you some little advantage in some way because Grim's website says it's "a bit weird but may be useful in some very special cases".
Quote from: steve on 14:23, 08 March 11Maybe you could generate a 3D display?, two screens switched 50 times a second, using coloured glasses as they do with 3D TV/Films.
Quote from: steve on 18:16, 08 March 11@redbox, are you saying the machine cannot access the second screen data directly, so it must be moved by the cpu to be displayed?
Quote from: CP/M User on 10:25, 04 April 11This has me stumped. According to Video Modes MODE 3 uses the same Bits per Pixel (BPP) as Mode 1 and yet it's only 160x200! Does this mean it's sort of limited to a Spectrum Sized screen? (which a number of games used anyway to allow for more coding?). I simply interpret it as a quirky mode. Pity the CPC cannot have 80x100 with all 27 colours anywhere on screen (not the split screen effect kind! )
Quote from: CP/M User on 14:06, 04 April 11I had a look at Markus' example which seems to suggest that it can incorporate 2 screens within a 17k program, so perhaps that's the only good thing about Mode 3, otherwise it's an unusual example.
Quote from: sigh on 15:22, 04 April 11Are we talking split screen?
Quote from: arnoldemu on 14:24, 04 April 11That was actually my test program.
QuoteThe test was 1) to check mode 3 was decoded correctly in emus, 2) to test on cpc clones to see if they were compatible in this respect, or if they decoded it different.
QuoteYes you can hold 2 screens within the same 17k, but the only way to switch between them is to use a software loop to shift the bits up and down. You can't switch in hardware.
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