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Anybody has the capability to burn it and mail it to me in EU/Germany would be appreciated. Thank you.

Dear all, I have a running Pro Log M900 PROM Programmer System (230V) that I am willing to part from. It has an National Semiconductor 4004 CPU in ceramic package INS4004J in it with date code 727 or week 27 of 1977. I haven't tested it to burn EPROMs but all the lights come on and the keys...

Dear all, in the process of trying to repair a PET, I had a smoke development and FI / RCD breaker tripping event. The suspected RIFA that burned was removed but the PET would still not run just like before. This was followed by a solder trace burnout on the back of the PCB (one of the power...

Dear all, I got this calculator that works flawlessly except for a intermittent (but most of the time) division issue. Entry/Plus/Minus/Multiply work reliably. Attached you find the manual in German, schematics of the very similar successor of the model (AS-B,121-B, slightly higher integration...

Dear all, I am trying to fix some super vintage nixie calculators (1969). I noticed they deliver some overvoltage out of the internal power supply. Roundabout 30% to high, ie. 236V instead of 180V for the nixies for example. While I hope this might still work, I am wondering if this is a partial...

Dear Experts, I bought a 1969 Casio AS-A calculator with 12 nixies that does not work propperly. I cleaned it and played around with it and after a while I even got it to work fully (!) to enter numbers and do calculations. That was a short thing though as it is now not lighting up any digits...

This pretty ST412 has worked well in my vintage collection and been running for maybe 20h uptime last year without any issues. Well, come last week I get the terribly unspecific 1701 at boot. It seems intermittend at first but meanwhile permanent. (I have had a 1701 a couple of time with other...

Dear all, I have had this a couple of times and never got to the bottom of it. Sometimes (especially on vintage kit connected with two prong connector ie. without PE) I get a continous tingle when touching the case. This is annoying especially when it is a joystick with painted metal case... It...

Gents, I would enjoy your thoughts on an idea I wanted to try with an extra working IBM 5155 I have: I was thinking of hiding an extra Raspberry Pi 3 Model B (RPI) inside somewhere and feed its' composite output from the 4 segment jack to the mono CRT input by feeding into the connector...

Fellow enthusiasts, I have a bunch of PETs and a strange question. I`d like to switch keyboards (graphical and business) and/or Monitor assemblies (between a 40 and a 80 column) amongst machines. I feel a little bad about it to create Frankenstein machines, but essentially I want a 40 column one...

Dear Expert, as per title my Mac Plus works fine in principle but even when off: After a while my house's RCD fuse blows. I think in Germany they fire at 30mA. I have no idea where to look. So how the hell is there a leak to shield pre power switch? Puzzling because it does this while off also...

Dear experts, this pretty CRT has a blurry screen. I looked at the service manual by SAMs and thought the internal focus adjustment would help at the flyback - but no help. It is only a little sharp if it is very dim. At reasonable brightness it sucks to look at. I am hoping for something simple...

Dear Resident Vintage Wizards, I'd like your suggestions in the following case: IBM 5150 16-64kB (Bios 1981-10-19) appears dead. No blinkenlights with MDA graphics, no beep, no floppynoise. My best guess is RAM failure based on min config diagnostic by minuszerodegreees. Voltages are fine...

Hi together, I also have 40+ tapes with software / games for the PET / CBM. Is there anybody interested and/or able to preserve them for the future? Many are not found i.e. on archive.org and I thought it would be a shame to lose them if the tapes go bad. What are your views?

Hi all, this is a different PET than my other Post. I have some free time currently so I started a lot of repair projects at the same time and request a lot of help. So thanks for your read or reply. But maybe we can preserve another Commodore for the future. So in this PET I get no image at...

Hello all, I am trying to put a PET back in service and things look great. However I have an issue with horizontal placement on the CRT. Characters at some point stop being placed to the right but at the same location. And then after a while they move right but squished. Above is a screenshot of...

Dear Experts, I messed up. I wanted to install a SD card in my nice II Europlus and since the case was off, I put the 8-bit card holding the SD converter the wrong way around into the slot. I turn on there is a louder than usual sound and now it is broken. No magic smoke but I broke something...