ok, the 8085 has those pins, the 68030 likely doesn't, haven't bothered to look. You might want to investigate a software implementation (called bit-banging) if you can find two spare pins. Harvey

Some processors (8085 for instance) have two serial pins, SID, SOD (Serial input/output Data) which needs to be considered. You could also bitbang a slow UART if you had two extra pins. Your standard

One approach I'd consider would be rasterization. I'd take a fast running A/D, feed it from the X and Y inputs, then combine the outputs into a low and high memory address, set that value according to

Ok, right off hand, I can't make too much out of them, but (a big but), I need more information. Firstly, looking at the manual, you expect to see the following: a negative going pulse that's 10 ms wi

If disconnecting the AC drive doesn't fix the problem, then to me, that suggests a problem elsewhere. Very possible there's still a problem with the transformer, etc, but with it disconnected, then th

Good thought. I rustled up a schematic, I have one of these and try to get the manuals for everything I have. The 25 Khz main inverter drives the primary of T2010. The upper winding of which drives th

I'm not sure on that. I'd have to sit down with the schematic and do some thinking about it. So what I hear is that with the AC supply connected, there's a problem. With it disconnected, there's no pr

I think I'm slightly puzzled here: normal connections with the HV multiplier disconnected and no boot. Disconnect power to the display section and the rest of the scope is OK. Seems to indicate displa

main@Test-Equipment-For-Sale-Wanted-or-Exchange.groups.io for the email address and likely Test-Equipment-For-Sale-Wanted-or-Exchange.groups.io for the URL. I see things advertised on that daily, and

I know of several sources, Qservice, the TekMuseum, Sphere.... There might be someone who has a dead 7834 somewhere with a bad CRT. You've put something out on the WTB list? Harvey

I think I did miss that post. You're ahead of me in the diagnosis, so a bad HV multiplier can mess things up. You did check the usual sources for the multiplier block? Harvey

Excellent first step. That says that (of course) the short is in the frame or the plugins. Now, 4.4 volts on the 5.0 supply has got to be out of tolerance, so I'd look at that. Measure the voltage dro

It would be good to look at the voltages with a scope as well, since they are effectively pulses during the chirp. The tektronix power supply (roughly the 7000 series) tended to sum all of the voltage

Check to see what the passive terminators actually do. While you'll get the waveform into the scope, the frequency response will not be what you expect. Maybe in the scope probe manuals, there's a pas

Actually, not really. The 134 amplifier (and twins) have considerable filters for shaping response. The 7A14 has a ring which changes frequency response (for different probes) when the ring is grounde

I've considered rebuilding the plastic middle pieces. I'd do the following: 1) create a model in OpenSCAD. I have enough experience and can play nice with it. 2) the problem with the model is that it

Use an inkjet or laser printer (color) to print on the back side of a transparency then use transparent glue to bond that to an aluminum machined panel. Harvey

Many of the chips communicate to the microprocessor's data bus. This is the ROM, RAM, chips doing I/O. Since the data lines are common to all these chips, and can be generally driven by the CPU or dri

If you *know* what you are going to display, getting an LCD display do show it is less effort than you may think, if you have the infrastructure. You either go ASCII to bitmap (currently I can do abou

Actually, if it were raster scanned, it would be easier. For raster scanned, you need to duplicate the v and h sync signals, then look at the video and store it in a dual port memory. Pick either a CR