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I have a Commodore PC 30-III but I can't find a way to start the BIOS menu. It displays the following message during startup:

Screenshot of Commodore 286 BIOS Rev 2.01 (ROM chip numbers 390339 - 03, 390340 - 03) having booted into MS-DOS

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Press Ctrl+Alt+Esc before you get the ‘Starting MS-DOS…’ prompt, but after the memory test (if any).

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