24 Jan
2008
24 Jan
'08
4:51 p.m.
Date: Thu, 24 Jan 2008 01:09:31 -0500> From:
rtellason at verizon.net> To: cctalk at classiccmp.org> Subject: Re: div by 10 on
Z80> > On Thursday 24 January 2008 00:30, dwight elvey wrote:> > There are two
windows in the Z80 memory that are double accessed> > by both the S100 side and the
Z80 side. One window at 1000H for> > buffering while the other is only 16 bytes used
for command, parameters> > and status.> > I'd be real interested in more
details about how they do that.
Hi
Not much to it. There is some state of the Z80 cycle when one
can access memory from someplace else. On the S100 side,
it can be synced with wait states. The 8080 is the slower
side.
I have the schematic but it is not scanned.
Dwight
_________________________________________________________________
Climb to the top of the charts!?Play the word scramble challenge with star power.
http://club.live.com/star_shuffle.aspx?icid=starshuffle_wlmailtextlink_jan