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Old 23 December 2013, 18:42   #505
Toni Wilen
WinUAE developer
Join Date: Aug 2001
Location: Hämeenlinna/Finland
Age: 43
Posts: 21,518
Originally Posted by amilo3438 View Post
Work For Nothing (Demo) by Turnips

A500 ECS 1mb ... some glitches pic.1, pic.2 , and strange line pic.3 !!!
(Note: It happens the same also on AGA 1200 ... hm, maybe the dms is damaged ?!)
A500 confirmed. Yeah, most likely damaged file.

Psycho Medium 4 (Intro) by Turnips

A500 ECS ... glitches ... pic.4 !!!
This is emulation bug, copper emulation timing is wrong (it is too slow in this situation). Needs some logic analyzer testing..

EDIT: It is caused by weird copper feature, special/dummy copjmp second cycle disappears if it would cross scanlines (=it would be positioned immediately after first strobe/refresh slot)

Lotus Esprit Turbo Challenge 2 (Crack Intro) by Two Live Crew

A500 OCS/ECS ... BLITTER issue or not ?! ... pic.5 !!!
It is.

Originally Posted by amilo3438 View Post
Continuation from:

A Small Intro (Intro) by Tww

A500 OCS/ECS (most common) ... strange, as on the link picture it looks different ... pic.1 !!!
It does not set color register number 15 and apparently it is full white after power up, at least if Denise is ECS version. A1000 (8362R6 Denise) shows it as black so A500 OCS Denise most likely does the same. (Color registers are inside Denise chip)

It is demo bug, chipset register contents after power up are not be guaranteed, but I still "fix" it.

Of course color is also wrong if any program, for example demo pack menu is run and it uses color 15.

Last edited by Toni Wilen; 23 December 2013 at 20:48.
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