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Old 25 November 2005, 13:50   #1
PiCiJi
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Unreal and Bubba'n'Stix

Unreal with emulatated A500 (sps release)

in the jump'n'run levels (second level for example) there is a wrong right screen border.

in titlescreen (not the first screen) type ordilogicus, press return in first level to quik jump in second level

by the way game sound fx sounds only ok in cycle exact mode.



Bubba'n'Stix with emulatated A500 (sps release)

in second level and following there is a wrong graphic line

in password screen type T1QKPF?CMG to quick jump second level
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Old 25 November 2005, 20:36   #2
Toni Wilen
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Quote:
Originally Posted by PiCiJi
in the jump'n'run levels (second level for example) there is a wrong right screen border.
Confirmed. Same problem as in T-Racer.

Reason is simple but not so easy to fix. Game changes background color when hpos>=0 and vpos increased by one (hpos 0-17 or so are visible in right border!). This isn't emulated properly and I don't see any easy fixes..

Quote:
Bubba'n'Stix with emulatated A500 (sps release)

in second level and following there is a wrong graphic line
Confirmed too. Basically same problem as in Disposable Hero titlescreen.

Technical explanation for second problem:

Emulation does two passes/scanline. First pass emulates custom chips, second pass converts collected data to host display mode and merges bitplanes and sprites etc..

Changes to BPLCONx-registers in mid horizontal line are only processed at the end of line (only color changes are done properly)

Disposable Hero changes resolution, Bubba'n'Stix changes sprite-bitplane priority. Line should be hidden under the wall (whole background image is done with sprite number 7 using copper and non-dma sprite mode)

I have had plans to fix this years ago.. Unfortunately this isn't trivial update.
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Old 26 November 2005, 10:18   #3
PiCiJi
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sounds for a lot of work. take your time
other things I have seen, don't know if a bug


Lionheart with emulated A500

The background gets garbage very shortly every few seconds (randomly)

I don't have a real A500 but the game doesn't show such behaviour on my real A1200.


Amberstar with emulated A500

have a look at the wrong horizontal line in the door graphic

here is a savestate
Attached Files
File Type: zip amberstar.zip (411.5 KB, 150 views)
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Old 26 November 2005, 12:22   #4
Toni Wilen
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Quote:
Originally Posted by PiCiJi
have a look at the wrong horizontal line in the door graphic
This really needs real A500 confirmation.. (using the _exact_ same images)
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Old 28 November 2005, 18:46   #5
PiCiJi
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maybe someone can check it. the Amberstar version from planetemu shows the same "problem".

Are there any other known problems in A500 emulation?
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Old 28 November 2005, 18:56   #6
Chain
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who needs emulation
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Old 28 November 2005, 18:59   #7
Retro-Nerd
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i can confirm the Lionheart bug, but it can be fixed with a cycle exact setting. This fixes also a spriteflickering bug in the Level where you riding your animal.
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Old 28 November 2005, 19:11   #8
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Old 28 November 2005, 19:31   #9
PiCiJi
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cycle exact mode reduces the flickering problem in Lionheart. But not completly.
but its ok.
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Old 28 November 2005, 19:39   #10
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ok, you are right. A short flickering every 20-30 seconds. But i noticed this only in newer versions of WinUAE.
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Old 06 December 2005, 19:44   #11
Toni Wilen
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Bubba'n'Stix and right border "feature" will be fixed in next release. (also includes T-Racer, Leander and others..)
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Old 07 December 2005, 17:48   #12
PiCiJi
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thank you Toni
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Old 07 December 2005, 19:11   #13
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Quote:
Originally Posted by Toni Wilen
Bubba'n'Stix and right border "feature" will be fixed in next release. (also includes T-Racer, Leander and others..)
You keep tweaking, fixing, improving etc...

I'll say it again, Toni you're a true legend and the Amiga community is lucky to have person as skilled / devotes as yourself helping things along.

Look forward to the next release.
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