User talk:DennyBaumgaertne

By access I mean
either learn or write to this reminiscence address. GS.

ProDOS incorporates most to all the disk learn speedups supplied by
DOS 3.3 third celebration enhancements, so it doesn't need to be patched to
sped up. DOS 3.Three may be modified to do different
things, corresponding to use a couple of extra tracks on disk for extra house,
relocate itself into the top 16K of memory on a 64K machine, but
again, these had been all third party patches, nothing official from
Apple. The MMU has varied settings for several types of memory including the
Special I/O area, user reminiscence, and stacks. MMU multiplexes access to real memory and i/O space. Should a consumer process try and entry reminiscence exterior it is
allowed vary, an interrupt will happen preventing (or delaying) the access. Interrupt ReQuests (IRQ's):

In actual life when the Lisa's 68000 CPU requests some I/O functionality, it
does not expect the end result immediately, nor does it anticipate the outcome. For
instance, our 6504 floppy emulator actually reads/writes sectors in what the
68000 would see as a single cycle.

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