Started by Axelay, 15:55, 21 June 09
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.int4 ld (intno),a ld bc,#bc07 out (c),c ld bc,#bdff out (c),c ld bc,#bc04 out (c),c ld bc,#bd12 ;<= CHANGE HERE - 13 is 1 chr too much out (c),c
Quote from: Axelay on 15:55, 21 June 09As a follow on to my register 3 scroll example, I was wondering about using a split to maintain a display area.
Quote from: Grim on 16:55, 21 June 09The problem is that the splitscreen produces 320 scanlines in a frame (48.83Hz refresh-rate) instead of 312 (for a 50Hz refresh-rate) because the 2nd screen (at the bottom of the frame) is one char too long.
Quote from: Executioner on 07:53, 22 June 09You can do a screen split mixed with a R3 scroll, but the split itself should always be performed in such a way that R3 is not changed between the scroll and the screen split. Changing R3 once per frame appears to provide near exact positioning, but more than once per frame will probably cause the PLL some headaches.
Quote from: Axelay on 06:46, 23 June 09I guess I am leaning away from using R3 as it looks like the left/right movement occurs with static components on my 6128 and I'm not that pleased with it.
QuoteI cant imagine any other way for it to have a stable display area on my 6128 while using R3 in the play area, when other examples of R3 use exhibit the left/right movement. It has a couple of character lines worth of gap between the two screens, so I wonder if that's there for stability purposes?
Quote from: Executioner on 08:57, 23 June 09I'm not sure what you mean by static components.
Quote from: Executioner on 08:57, 23 June 09Yes, most likely Super Cauldron does do that, and if done correctly, it shouldn't look too bad, but I wouldn't recommend it when there are other methods which work better (eg. The sample horizontal scroll I did with the fixed status line(s)). btw, does Super Cauldron work with a modulator then?
Quote from: Axelay on 15:53, 23 June 09I dont have a modulator, so I dont know anything other than what I read in a magazine once a long time ago (that when ghosts and goblins scrolled the picture went black & white). So I can only pressume it wouldnt work.
Quote from: Axelay on 06:03, 15 August 10So I'm wondering what specifically are the problems, or potential problems, with doing the R3 change between the screen split and twice per frame? As it stands it appears to give a much better result on my CPCs!
Quote from: Executioner on 08:22, 23 August 10You can run the PlusTest HSYNC test (2) on different systems (it works on non-Plus systems too for test 2) to experiment with the R3 value by pressing Z or X.
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