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All punches have now been sold.

That is typical design for a 3.5" drive. Chances are there is some solidified gunk in the groove. I'd clean that grease off with alcohol, make sure...

Your Original 22DISK definitions: BEGIN RC70 PICCOLO RC702 - DSDD 48 TPI 5,25" DENSITY MFM ,LOW CILINDERS 40 SIDE 2 SECTORS 9,512 SIDE1 0...

"for 8 hours a month" pretty much means there's a NiCd battery inside...

I have an electronic typewriter that can store macros in memory, even when it is turned off. However, it comes with an instruction that says it must...

well, first try yesterday, and it's (of course) a fail :D my fear was true, but not from what i believed first. i face serious noise troubles, but...

I did try with the latest released versions of BP/TP. I'll try building in order as you recommended, or saving as some kind of project.

Hi Geoff, Thanks a lot, although I could get very useful informations, the full manual will be helpfull. I am finishing my applcard ii which will...

Thanks MikeS. For that one MC6821P, the [ giving a $ output was just one example, yes. Sorry, I should have been more explicit. Every key on the...

I did get some tapes for the Iriwin drive and attempted to repair 4 of them with the plastibands, and while I’m quite confident I got the bands on...

If you want to try using a 3.5" Floppy Drive to emulate an 8" Floppy, Marcus Bennett has that information available. While his site is down...

The principle he's using is based on "supercaps", a method used to power devices for generally short intervals (such as a brief power failure): ...

@wa2flq you mean measure A pin to B Pin like this ? http://www.retrocmp.com/how-tos/setup-a-pdp-11-unibus-backplane @qbus it your video :)...

Comparing a capacitor to a battery: A capacitor is a charge storage device, in a sense, similar to a battery however there is a very big...

About the 3 floppy drives? were in working order but the third gave a flashing red LED on the motherboard. I opened the drive and I saw tha 1 IC had...

Finally I found the error with the video signal. First I replaced all capacitors in the power supply and that already gave a big improvement. The...

Larry, Thanks, I'l go work on that Maurice

I'm very happy with the results I got :). I just allocated 32K inside a physical page and used 8 bit PCM (8192 and 11025 Hz). Sound quality is...

So you might be the first person to confirm the existence of this drive! You actually sold 251R models? Got any still new ones out back? haha

First thing is to add more memory, at least 512 MB and even more if possible. You may want to check that the system can handle more than 512 MB...

some cf cards do not work like the sandisk, in my case I had to take a 2GB transcend on my ibm 5155, and it worked, I had the same problems as you,...

Using gold caps as a replacement isn't a new idea. Good thing is, since they are caps, there's no need to disable the charging circuit. Bad thing is,...

http://bitsavers.org/pdf/cdc/cyber/cyber_200 I have a lot more from a house cleanout a friend of mine did in San Jose I'm trying to decide if I...

Cool, didn't realize you were involved with the STAR. Yes, that's possible, or it might be a relatively dumb peripheral processor console. I'll ask...

Got the XT-CF installed in my Compaq Portable and it ain't working. It sees the card and formats, but upon formatting completion, it shows an error...

"Tandy 1000A Service Manual 15 Oct 2013 Scan.pdf" appears to be complete also - just has one of the 1000A schematic sheets out of order. "Tandy 1000A...