[Openmsx-bugs] [ openmsx-Bugs-912269 ] bad VDP timing in turnix2

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Bugs item #912269, was opened at 2004-03-08 22:08
Message generated for change (Settings changed) made by manuelbi
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Category: Graphics
Group: None
>Status: Closed
>Resolution: Fixed
Priority: 4
Submitted By: Wouter Vermaelen (m9710797)
Assigned to: Maarten ter Huurne (mthuurne)
Summary: bad VDP timing in turnix2

Initial Comment:
Turnix2 contains this code: 
 
001f : pop    hl 
0020 : in     a,(#99)       ; s#2 selected 
0022 : bit    5,a 
0024 : jr     nz,#001F 
 
The last jump address is wrong. However on a real MSX the 
program just works. So it seems the timing in openMSX is 
(slightly) different. 
 
See attachment to see the code is a larger context. 

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>Comment By: Manuel Bilderbeek (manuelbi)
Date: 2006-04-28 18:54

Message:
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user_id=78178

Fixed by Maarten: VDP accuracy fix: corrected length of
horizontal blank.
Thanks to Daniel Vik for investigating the Parallax logo
code and for writing measurements programs that helped in 
determining the correct horizontal blank length.


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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=421861&aid=912269&group_id=38274