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30 lines
1.4 KiB
Plaintext
30 lines
1.4 KiB
Plaintext
"Dope" demo bugs (DOSBox-X's fault)
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BUG: Noticeable pause of music at points where VGA BIOS is called to set video mode during demo
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However, this pause also happens on real hardware if the BIOS does not use the IRQ for hard
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disk access (tested on a Pentium MMX 133MHz with a CompactFlash card for a hard disk).
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BUG: You can only run the demo once. Additional attempts log "illegal instruction" messages and
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crash back to the DOS prompt. You must close and reopen DOSBox-X to run the demo again.
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- I know for a fact that is not a feature of the demo. Having run it on real hardware, I know
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the demo can be run again after the first time (though it is not reliable at reinitializing
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the GUS to a known state).
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- The debug messages from DOSBox-X are:
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Warning: Illegal read from b66b1da, CS:IP 8: b66700a
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DYNX86:Can't run code in this page!
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Warning: Illegal read from b66b1da, CS:IP 8: b66700a
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Warning: Illegal read from b66b1db, CS:IP 8: b66700a
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141992554: CPU:CPU:66:GRP5:Illegal call 7
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Warning: Illegal read from b66b1da, CS:IP 8: b66700a
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Warning: Illegal read from b66b1da, CS:IP 8: b66700a
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Warning: Illegal read from b66b1db, CS:IP 8: b66700a
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- This apparently only happens if "private area size" is less than 16384, regardless of
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"mainline compatible mapping" and "private area in umb" settings. Hm... is DOSBox
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writing things beyond the block of private space it just allocated?
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