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If it has Twinax connectors, it's for S/36, AS/400, iSeries etc. (5250 terminals). The mainframe stuff uses BNCs...

The stock Tandy 3.5" drives in those machines receive power over lines that are normally disconnected or connected to ground in standard floppy...

Start to horse around with Simh build. Here is what I did .RUN SYS BUILD $PO\O\R KL8E: *TTY R2SY: *SYS R0AB: *R20A *R20B R0CD: *R20C *R20D

I used wipedisk on the 511 drive on my ps/1. . Fdisk made a 511 partition. Formatted it with pc dos 4.01. Transferred drive to the 5150 and it boots...

I decided to play around with the TL866A and the VP290 and am having a bit of a quandary. I tried to erase and reprogram a few of my Chinese 22V10D's...

modem7, Thanks for the information. I went to order some replacement capacitors on Digikey website and found a candidate replacement for the 10uf...

Possibly a result of: From a magazine article on the IBM EGA at here], "Most programs that run on the Monochrome Adapter should run on the...

I think computer punches have much harder punch blocks. As far as I know the UK made CREED teletypes with punches don't need oiled tape either.

What I was missing was the proper adjustment of the monitor contrast and brightness controls :crazy: Easy fix, though. BTW thanks to Daniel...

Dave, After that loop we get to the 300's in microcode addresses! MACHINE 1 - State Listing ...

I've always wondered: why do Teletypes and similar machines require oiled tapes while most computers used plain tape?

Dave, Here is the trace starting at 0BD, but it quickly becomes a new loop. I think I'll change the trigger to 0C9 to see what happens next ...

No Daver, when i opened for first time the Cdtv, i haven't see ferrite cover on T1!!

Tantulums will usually have a plus sign or a white bar to indicate the polarity. Ceramic caps can also fail. These often don't have any numbers on...

The machine is relatively stable at this point; it boots, it keeps the CMOS settings, there are no parity errors and the machine passes CheckIt...

Your picture of T1 back in post #45 doesn’t look the same as the photograph you have linked to. Your photograph appears to be missing the outer...

To determine the range of ROM's that would work with it, a circuit digram would be required, or a pointer to a web page that has the information. ...

After more experimentation I have confirmed that the EV-125 in the STASON configuration has serial ports A and B (external) addressed as COM1 (3F8h)...

I agree with Dwight. They look fine. I have had more issues with tantalum caps that burn up on p II boards

Excellent. I have the PC and 4-bit counter installed now and I seem to get what you do down to address 085. I know why this fails - there are...

Visually, they look fine. I don't see any stuff leaking from under them. You could replace them but they are likely fine. Measure power rails and if...

Could you please re-post the schemaic :) Cheers. Phill.