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Sonnet Crescendo WS G4 500 upgrade cards
#6
Yes, it's the flashing. Basically the accellerator companies figured out a process whereby they could copy the Apple ROMs from the OEM processor daughtercard into their own cards and thereby allow the device to operate properly.

Back in those days the Apple ROMs contained some of the low level boot code necessary to access various hardware components and the like. Open Firmware on later model PowerPC systems allowed this to be entirely software and ROM free but the Wallstreets were amongst the last generation of systems (along with the beige G3s) where the Open Firmware implementation was still incomplete and legacy hardware not to dissimilar from BIOS was required.

Or something like that.
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Re: Sonnet Crescendo WS G4 500 upgrade cards - by gabester - 08-20-2013, 06:05 AM

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