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PostPosted: Mon Jun 12, 2017 6:21 am 
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Student Driver

Joined: Wed May 18, 2016 6:02 am
Posts: 20
Emulating aMacintosh quadra 900 (supposed to be 840av but BII wont take 2mb Roms)
Boots up, displays flashing box that reads " Sorry, a system error occurred
Unimplemented trap
To turn off extensions, hold down Shift while booting Macintosh"

8 MB, 0.5gb hard disk, System 7.1 CD-ROM
Holding shift does nothing because BII boots too quick.


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PostPosted: Mon Jun 12, 2017 7:24 am 
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Joined: Wed Nov 11, 2009 5:47 pm
Posts: 989
Location: Germany
Could be missing FPU emulation. Unimplemented Trap used to pop up because of that.
Is there any special reason for you to boot from a 7.1 CD?
It may be easier to get things rolling with an image which is known to boot.
E.g. here: http://macintoshgarden.org/apps/macos-753-emulators


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PostPosted: Mon Jun 12, 2017 7:55 pm 
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Student Driver

Joined: Wed May 18, 2016 6:02 am
Posts: 20
There is no option that reads ' 68040 with FPU '


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PostPosted: Mon Jun 12, 2017 8:33 pm 
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Joined: Fri Nov 27, 2009 5:11 am
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One thing to point out is that Basilisk II doesn't actually emulate a real Mac, and used only two ROMs as reference ROMs during development. Use of any other ROMs may result in BII's toolbox patching to fail in unpredictable ways, although I've tested with most "compatible" ROMs and have found that most are at least semi-functional. I've had that issue running older OSes with the Q900 ROM.

The best ROM to use for 7.1 is the Performa 200 ROM, which is essentially a Classic II ROM. However, this is black and white. The best color ROM is probably the Performa 460-series ROM (LC III equivalent).

For 68040 ROMs, the best option is probably the Quadra 650 ROM, which was the reference ROM for BII development. This is the best ROM to use for 7.5 and later.


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