I'm probing two DB25 connectors on the old IBM 5110 to figure out how to programmatically jiggle some pins and get some serial IO going. I've been working on writing a terminal emulator in its PALM machine code (now that we have an excellent assembler for it) - I may go lazy and just have it wrap around on the screen, instead of actually scrolling the screen (the display circuit apparently has no scrolling, you have to DIY).
I've also written a kind of "synthesizer" to toy around with the timing of its speaker. It's a video I'll be working on after the "domesticating the home computer" stuff is done. Anyway, as an option slightly cheaper than the Saleae, I'm trying the 32-channel version of the DreamSourceLab U3Pro32. It's not horrible, I've 24 pins hooked up so far. I debated on if 2x16's would be better. Amazon is good about returns, but this little DSL probe is good enough, I'll be keeping it. DreamSourceLab DSLogic U3Pro32 USB-Based Logic Analyzer with 1GHz Sampling Rate, 2Gbits Memory, USB 3.0 Interface, 32 Channels -Steve On Mon, Mar 13, 2023 at 8:12 PM Paul Koning via cctalk < cctalk@classiccmp.org> wrote: > Gents, > > I've been doing logic debugging (on a fairly primitive software defined > radio I designed back in 1999) with an old Philips logic analyzer. It's > not bad, certainly fast enough (I need 100 Msamples/s, it can do twice > that) and it's more than wide enough (I need 32 channels). But its capture > memory is microscopic so I struggle to see more than one or two > transactions, and I need to see more than that. > > Some poking around shows various USB-connected logic analyzers for quite > low prices, and a number of them seem to have suitable specs. I also ran > across sigrok.org which seems to be an open source logic analysis > framework that can drive a bunch of those devices. Nice given that too > many of them only come with Windows software. > > I suspect there are others that have not too expensive logic analyzers and > might be able to offer up suggestions or product reviews. > > paul > >
