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JiffyDOS Kernal Upgrade
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== Installation == # '''Disassemble''' the computer/drive; locate the KERNAL or DOS ROM (consult the service manual for your board revision). # '''Note the notch''' orientation, carefully lever the old IC from its socket. # '''Fit the EPROM adapter'''—ensure pins are fully seated and the notch faces the same direction. # '''Mount the toggle switch''' and wire it to the adapter (or fit the supplied PCB-mounted switch). # '''Re-assemble and power-on.''' Type <code>@</code> (return) – a drive error-channel read – to confirm the JiffyDOS banner. A full illustrated guide (PDF) accompanies each ROM set and is mirrored on C64-Wiki . === Drive-only Upgrade? === You may install JiffyDOS in '''drives only'''; they remain perfectly usable from stock C64s (they fall back to Commodore serial timing when the computer side is stock). However, the computer’s KERNAL must be upgraded to enjoy the speed increase.
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