AppleWin/docs/NoSlotClock/NSC_ROM_Summary.txt

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Here's a summary of NSC/ROM chip locations - and which drivers work:
"CD" ROM socket: C000-DFFF (internal) ROM space - all drivers work
"EF" ROM socket: E000-FFFF ROM space - none I've seen yet
"CF" ROM socket: C000-FFFF (internal) ROM space - all drivers work
Slot ROM socket: Cs00-CsFF (slot) ROM space - NS.CLOCK.SYSTEM works
And here are the drivers - and ROM pages they check
ProDOS "SWU.SYSTEM" - internal C3
ProDOS "NS.CLOCK.SYSTEM" - internal C3 C8 / external C1-C7
GEOS "NoSlot Clock" - internal C8