[Openmsx-bugs] [ openmsx-Bugs-1847275 ] Penguin Adventure doesn't work on some machines

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Bugs item #1847275, was opened at 2007-12-09 15:15
Message generated for change (Comment added) made by manuelbi
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Category: General/misc
Group: None
Status: Open
Resolution: None
Priority: 5
Private: No
Submitted By: Manuel Bilderbeek (manuelbi)
Assigned to: Nobody/Anonymous (nobody)
Summary: Penguin Adventure doesn't work on some machines

Initial Comment:
On at least a Philips VG 8020/00, Goldstar FC-200 and Toshiba HX-10, Penguin Adventure crashes in the initialization code. On my real HX-10, it runs fine.

Analysis by BiFi:

<BiFiMSX> badly interfering interrupt
<BiFiMSX> the problem is in the init part:
<BiFiMSX> 1. set up blocks (store values in RAM)
<BiFiMSX> 2. reset that area
<BiFiMSX> 3. init sound (enable interrupts)
<BiFiMSX> 4. interrupt occurs
<BiFiMSX> in step 1 the hook handler is set up as well
<BiFiMSX> so the penguin adventure handler is called
<BiFiMSX> the handler switches to the sound part to handle it, and restores the 'old' blocks, which were reset just before the sound init

<Quibus> it seems to get in some kind of loop around 0x2766
<Quibus> 0x2762 - 0x2768 is a djnz loop

So, there seems to be something going wrong with interrupt timing?

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>Comment By: Manuel Bilderbeek (manuelbi)
Date: 2007-12-10 09:21

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This seems similar to 739150 (Zanac title corrupted), where there is also
a badly timed interrupt.

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