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Running Windows (or anything else) on your Mac Discussion of Classic or running Windows, Linux and other OSes on the Mac.

OS9.1 Checksum

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I downloaded OS9.1 North American English, four times (4x) and it fails the checksum every time. Then I d/l OS9.1 International and its fine. Same with Italian.

I finally decided to SKIP CHECKSUM process and install regardless. I get the error, could not find "Installation Tome".
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Thanks to Google + Internet, and then MacFixItForums and Appletechs for the answer. In case anyone else has this problem, and happens to find this post through a search. The problem may be corrupt data in your Mac's PRAM. Flash the Mac PRAM by retarting while holding the keys :

COMMAND(Apple Key) + OPTION + P + R

upon restarting your Mac. You will see a flash/flicker of the screen before the Mac logo appears, and then the the Startup Beep/Sound again, at which point you can release the keys. I downloaded the OS9.1 updater again (this may not be necessary) and this time no checksum nor Installation Tome Error. The Update ran perfect.

Although I have not tried this, apparently you can "deep reset" the NVRAM and PRAM by using OPEN FIRMWARE upon restart with the keystroke combo:


and then issuing a:

#1) reset-nvram
#2) reset-all

The site says dont screw around issuing random OPEN FIRMEWARE commands if you don't know what you are doing, or you may F up your hardware. The above two (2) commands are supposed to be safe but other than that exercise caution.

See the following links:

Good Luck
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Can I use OS9.1 and OS X in tandem? mackelly Switcher Hangout 4 10-08-2003 01:29 AM

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