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carlosedufs / cogwheel

Automatically exported from code.google.com/p/cogwheel
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Graphical bugs in GP Rider #18

Open GoogleCodeExporter opened 8 years ago

GoogleCodeExporter commented 8 years ago 
1. Load GP Rider (SMS).
2. Start a new game.

The display flickers badly, occasionally displaying corrupted tiles.

(Maybe a register needs to be locked at the start of a frame? It looks) 
almost like the name table address is being set incorrectly mid-frame.

Original issue reported on code.google.com by benry...@benryves.com on 28 Feb 2008 at 12:00

GoogleCodeExporter commented 8 years ago 
Reduced to one scanline of corruption in r201.

Original comment by benry...@benryves.com on 7 Apr 2008 at 9:45

Attachments:

GoogleCodeExporter commented 8 years ago 
Graphical errors don't appear if the CPU is swapped out for Marat Fayzullin's 
Z80 
emulator.

Original comment by benry...@benryves.com on 18 Aug 2009 at 11:12

GoogleCodeExporter commented 8 years ago 
Nope, Marat Fayzullin's Z80 emulator doesn't help - it's a bug in my usage of 
it, 
not counting CPU cycles when servicing interrupts (which shaves 13 clock cycles 
off 
each response).

Original comment by benry...@benryves.com on 18 Aug 2009 at 11:39