> 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 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 which really makes it a lot clearer that they are active low instead of sticking the L on the end of the names which has confused people in the past too. Colin ===== Quazar : Hardware, Software, Spares and Repairs for the Sam Website: http://www.quazar.clara.net/sam/ Issue Five of "Sam Revival" Magazine Out Now !
