is that your scope? or is it a side effect of work? I bought an old 2216 analog Tek scope and that's ok, and I also have a USB module for my lab PC that is a multi function scope and signal generator. I also have a small USB powered logic analyzer.
On Sat, Mar 28, 2015 at 12:49 PM, Stephen Adolph <[email protected]> wrote: > WAIT - that is a storage scope! You should be able to really dig in > here. But you will need to start looking at single traces and get clever > on triggers... > > > On Fri, Mar 27, 2015 at 8:14 PM, Jovan Trujillo <[email protected] > > wrote: > >> Hi Guys, >> >> I'm trying to fix a dead Model 100 which gives a blank screen when >> powered on. The machine is not responsive to keyboard input as well. I >> can't get it to beep. While poking around with the oscilloscope it >> seems the power is ok. The clock input to the CPU is also probably >> good enough. The only chip that gives me a messy signal is the 81C55, >> which routes all of the I/O from the keyboard and LCD screen. I've >> tried reflowing all the connections to the chip. There was a moment >> when the thing beeped as I pressed a bunch of keys and the screen was >> giving me garbled output, but upon hitting the reset button everything >> died again. >> >> I'm thinking I need to replace the 81C55 but wanted a second opinion. >> What do you guys suggest is a good replacement if I do need to buy >> one? >> >> Here is a lonk to my oscilloscope output: >> http://jovan.freeshell.org/weblog/ >> >> Thanks, >> Jovan >> > >
