On Wed, 23 Jul 2003 14:10:26 +0100, "Colin Piggot" <[EMAIL PROTECTED]> wrote:
> > Does anybody know how IORQL, RDL, WRL reacts at the SAM? > > > At the Spectrum it will set to 0 if active. Should it be 1 > > at the SAM if active, then this signals would be inverted > > with an Invertor. And as it looks, they are set to > > 1 instead 0 at the Spectrum. > > The IORQL, RDL, WRL, and MREQL lines are stright from the Z80 and are '0' > when active.... (active low) > I'll confirm that. > I guess the 'L' is put on the end of the names in the tech manual etc to > show they are active low .... it would have made a bit more sense to call > them /IORQ, /RD, /WR and /MREQ... or have them typed as: > _____ > IORQ when being printed > I believe it was something to do with the design package that Bruce used. Quite bonkers and as you say misleading. -- Nev - please note that mail to address nevilley@ will now go into a spam bucket because of excessive mail abuse. Please use one of the new addresses.
