31 Mar
1999
31 Mar
'99
3:31 p.m.
"Hans Franke" <Hans.Franke(a)mch20.sbs.de> wrote:
Hi
On one system I worked on, it had an input board that didn't
have M1 decoded properly. It was a real funny problem,
It would trash the interrupt vector when executing different
address locations, when the interrupt hit. Adding debug
code would move the problem around. It took 2 weeks to
track this one down.
Dwight
I have never
really understood the purpose of the M1 pin or cycle. Can
anyone in simple terms explain it's purpose?
M1 serves various purpose on the Z80 Bus: