[Coco] What do you use for pull-up and pull-down TTL resistor values? (LS series) (coco related project but possibly OT)

[go4retro at go4retro.com]

I’m in the beginning stages of a 22 film marvel marathon in Chicago but I think I am still mostly coherent.  In any case I will jump on the get a scope bandwagon and also echo Ed’s comment about getting a non usb one.  That said I priced the Handel and rigors and went with a single team for a new scope.  However, if a couple hundred is too much to drop right now, pick up a used analog scope from eBay.  I have a nice dso but I will admit my old analog is still my go to scope.  100 MHz is nice but for 1-2Mhz stuff a 20 MHz unit should not be overlooked if the price is right.

Jim



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On Apr 23, 2019, 5:05 PM -0500, Ed Snider <zippster278 at gmail.com>, wrote:
> I agree wholeheartedly with Gene. An oscilloscope will help your learning curve immensely.
> It’s an absolutely must have item. You want at least 10 times the bandwidth of whatever frequencies
> you’re working with. A 100MHz scope is a good place to start.
>
> I’d recommend staying away from the PC/USB type and getting a stand-alone unit such as the
> Hantek DSO5102P which can be had for about $250 (eBay, etc.) and has a lot af nice features
> for the price.
>
> Honestly I wouldn’t even consider going without a scope at all building and troubleshooting
> electronics. They really are essential and most definitely worth getting if you’re going to much at all.
>
> - Ed
>
>
> > On Apr 23, 2019, at 1:59 PM, James Ross <jrosslist at outlook.com> wrote:
> >
> > Gene Heskett wrote:
> > > If you are at all serious about learning this stuff, remove the
> > > word "eventually". Get the scope NOW.
> >
> > ha! good advice Gene!! No doubt you are right. In fact I could probably use one right now with a practice circuit that has a glitch. I've built it twice, both times exact same glitch. I am going to work on it some more and will post about it if I can't figure it out.
> >
> > James
> >
>
>
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