Z80 CLK DRV

Date: Sun, 1 Jul 2012 21:42:31 +0100 (BST) From: ard at p850ug1.demon.co.uk (Tony Duell) To: cctalk at classiccmp.org Subject: Re: Z80 CLK DRV Message-ID: <m1SlQyb-000J4jC at p850ug1> Content-Type: text/plain I cna't help wit hthe pinout, but I can guess the function. IIRC the clock input of the S80 is not actually TTL compatible, it needs to be pulled up to the 5V line.My guess is that thes are clock driver cirucits for this signal, they take a TTL level singal in and give out the genuine 5V signal for the Z80 clock input. I used to do a lot of Z80 designs, most with classic Zilog Z80s, but also some later ones with Harris CMOS Z80 clones for battery-powered applications. I don't recall a lot of difficulty with the clock generation, I used classic 74xx chips. Generally I started with a faster xtal oscillator and divided down with something like a 74HC161, so maybe that was all that was needed to get the right clock swing. Jon