Monitor for iSBC 8024

From: Eric Smith <eric_at_brouhaha.com>
Date: Sat Nov 4 19:22:38 2000

I wrote:
> And both the Z-80 and 6502 have at least one more
> bit that's "sort of" programmer visible, the NMI
> edge-detect flop.

Allison wrote:
> I tried to limit it to the programmer accessable. If
> we add temp registers and whole knows what in the
> state or microcode portion of the machine it surely
> would grow more.

I'm not including internal temporaries that are not
exposed in any way either. But depending on how your
hardware is wired, the NMI edge detect flop can have
substantial influence on how you write your interrupt
handler. Thus it is in fact programmer visible, though
not as much as e.g. the Z-80's R register.
Received on Sat Nov 04 2000 - 19:22:38 GMT