How exactly does vice simulate a drive?

matsondawson · Post by **matsondawson** » Mon Feb 18, 2013 2:14 am

I want to add d64 capability to Vic20chrome/JSVic20 and I know that VICE can either emulate a full drive or basically hack one.
What functions in the kernel does it hack into to do this?

tlr · Post by **tlr** » Tue Feb 19, 2013 12:23 pm

IIRC it traps the IEC routines in kernal (listen, lstsec, talk, tksa, acptr, etc...). Trap meaning a "out of band" way of diverting processing to vice code with out the emulated cpu noticing.