31 Mar
1999
31 Mar
'99
12:39 a.m.
On Wed, 31 Mar 1999, Arfon Gryffydd wrote:
I have never really understood the purpose of the M1
pin or cycle. Can
anyone in simple terms explain it's purpose?
First, your linux sig line is kewl but over a teknet link editing it off
a reply is a royal PITA!
M1 signals the start of an instruction fetch or an interrupt cycle start.
It's machine status to differentiate a opcode fetch from a data read or
write. it serves other uses especially with the Z80 periperal chips.
Allison