Dia... Freeware go to http://live.gnome.org/Dia Much better than drawing :) -----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Steve Gray Sent: Friday, October 01, 2010 7:59 PM To: firstname.lastname@example.org Subject: Re: iec to pet Ok, looks like I'll have to re-check the board. Perhaps I missed something, like a trace under a chip. I do know that the board works fine. Thanks for the feedback. Steve PS:Can anyone recommend a good free schematic editor? I think I played with Eagle a few years back, but perhaps something new is out now. ----- Original Message ---- > From: "Hoffmann-Vetter, Martin" <email@example.com> > To: firstname.lastname@example.org > Sent: Fri, October 1, 2010 6:25:37 PM > Subject: RE: iec to pet > > Hello, > > > To me, it looks like /WE and /OE will be active together, not usually > > a good thing. > > Yes, i think there is an error, too! > > Because: > > /OE = /(SR/W & SPhi2) > > That is correct! > And: > > /WE = /(SPhi2 & /(/OE & /0)) > = /(SPhi2 & OE) > = /(SPhi2 & SR/W & SPhi2) > = /(SPhi2 & SR/W) > = /OE > > That isn't correct! I Think the logic without U4b is better. Then the output > from U4d must be short to the input from U4c. So the logik is: > > /WE = /(SPhi2 & /OE) > = /(SPhi2 & /(SR/W & Phi2)) > = /(SPhi2 & (/SR/W | /Phi2)) > = /(SPhi2 & /SR/W | SPhi2 & /SPhi2) > = /(SPhi2 & /SR/W | 0) > = /(SPhi2 & /SR/W) > > And that must be okay! > > Greetings from Germany > > Martin > > > Message was sent through the cbm-hackers mailing list > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2010-10-02 01:00:08
Archive generated by hypermail 2.2.0.