Path: utzoo!utgpu!news-server.csri.toronto.edu!cs.utexas.edu!sdd.hp.com!mips!ptimtc!nntp-server.caltech.edu!toddpw From: toddpw@nntp-server.caltech.edu (Todd P. Whitesel) Newsgroups: comp.sys.apple2 Subject: Re: zip cpu Message-ID: <1991Jun15.041222.4177@nntp-server.caltech.edu> Date: 15 Jun 91 04:12:22 GMT References: Organization: California Institute of Technology, Pasadena Lines: 20 whitewolf@gnh-starport.cts.com (Tae Song) writes: >Yes, the Zip and the TWGS uses the same 65816 CPU. The 9+Mhz CPUs are called >"shmoo" parts, you can get them to run faster by increasing the stanard >voltage (5v) to something like 5.5, but not 6v (which, BTW well destroy the >CPU)... you just have to keep the voltage under 6v. The Zip has all the >connections and places to solder parts do you can supply a ~5.5v to the CPU. Yes, but If you are smart and buy the >9V part from Zip then what you will get is a hand-picked part from an 8 mhz shipment that does in fact run at 10 Mhz with the standard 5 volts. I have one running at 10 and it says 8 on the chip; haven't had any problems I could trace to the Zip yet. BTW, Soldering the crystal in is a hell of a lot more reliable than socketing it. You could use precision machined sockets (which cost a buck instead of 30 cents, or thereabouts) but when it comes down to it nothing is more reliable than a good solder joint. Todd Whitesel toddpw @ tybalt.caltech.edu