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I read about something similar in Steven Weynrich's book https://www.amazon.com/Sophistication-Simplicity-Times-Apple-Computer/dp/0986832278 about an...

But sometimes the failures that odd of billions to one can happen. I once worked on a multiuser system that had one failure, RTC no advancing. ...

I don't believe Radio Shack or Tandy Corporation ever attempted to trademark their model names, because you can't trademark a number -- that's why...

You might have better luck with a IEC C19 style PDU, they're common in modern server racks.

The part I can't figure out in my case is why the working drive is able to read what the 'bad' drive is creating no problem. I thought with...

I can't promise this is the cause, but it's the sort of thing that _can_ be the cause of bizarre problems like this. 16 MB is a practical maximum for...

Hi Frank, Simple answer is no. I have only just seen it on the schematic and found where it is on the PCB...

When the POST configures a pin in 8255 as an output then what voltage is expected?

...... further to the above post, if you have those two products in your workshop, the sequence of cleaning with the CO contact cleaner then...

If you want to talk to the true fanatics of the 6502 processor, the guys at 6502.org are all about these old SBCs and trainers.

I think (of course as well as all the possibilities of failing components etc.) that if these terminals have seen a lot of use the loss of brightness...

Ah, its a modern 4 band + tolerance band. New fangled contraptions :-)! Dave

The databus should only be an input... NOP instructions. If you think about it, your original post had no resistor(s) at all, so if driven as a...

Ouch! This is good to know, thanks for bringing it up. I'll go update the instructions to warn about that.

It is 47 KOhm. Very difficult to read, so I did check it with my multimeter.

8088 IBM: http://cgi.ebay.com/274598683345 8088 T1000: http://cgi.ebay.com/124468596282 Pentium Generic: http://cgi.ebay.com/124468878445

Very nice job. Wiring looks good. Wait, is that a 47 Ohm resistor? If that pull up is grounded, it would draw 100 mA and dissipate 1/2 Watt. It will...

I think that suggestion of the Rockwell AIM-65 was pretty good. I just bought one ! photo attached. It will be a lot of fun to learn about these.

Ok stupid question, but did you try the "screen" potentiometer (I think it's either a trimmer or more likely a small-ish insulated potentiometer...

The lousy built-in data separator circuitry on the Model I might also have been a factor in the griping, although I can't really think of a good...

I've just seen the call daver2 put on another forum :) I had a VT420 too many years ago, on mine the flyback transformer was cracked and leaked some...

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OK, It's not pretty, but here it is... Quality of the images is not great, I have an older iphone.

I never had issues with 80-track 96tpi drives. I had a couple of them in my TRS-80 Model 4 (FH drives), another friend had two Mitsubishi drives for...