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I just tried to boot the 4000/90A that I have and it refused. It showed all led on. It used to work half a year ago. Switched PSU from another machine - no difference. Removed CMOS battery backed memory - no differenence. What else can be the problem? Would a depleted CMOS memory battery...

As part of a trade I am now an owner of a Datapoint 2200 kit to assemble. All parts seems to present so I am going to start with the power supply. Then the question arises: what kind of software can I find that will run? I see a bunch of .tap files on bitsavers. Hard to tell what tapes are...

One of the read/write windings of the Apple II disk drive I have here has gone open circuit. I have already confirmed that is not thin cable but somewhere inside the head the break is. Does anyone has a spare head? Or a scrap drive with good head?

I have gotten a 6809 SWTPC system with a MF68 floppy system. It nicely boot the FLEX operating system and it works really well after fixing a number of issues with computer itself (6809 CPU broken among them). I am a bit interested in running OS-9 or Uniflex. But I read that UniFLEX only was...

I have gotten a VAXStation 3100/76 that show all LEDs lit on the back. Is there anything one can do or is it a dead parrot? The 5V is there at least. But haven’t checked the rest as I don’t know the pinout.

Two boards for interfacing an IBM RT with an IBM 5080 graphics system. These boards were detected by the RT when I pulled them out of the machine but I have no means of testing them further since I don't have a 5080. Trade for an IBM 1392366 keyboard for the RT. I.e. the buckling spring...

I have been asked if I were interested in a Apollo DN660. Sounds like an interesting machine. Top of the line graphics workstation from the early 80ies. Some kind of bit slice implementation of the 68020. It looks like there are software on bitsavers.org, but I can find very little hardware...

For my SWTPC project I designed a couple of extender boards. I made a run on JLCPCB and got five pair of boards. I will most likely ever need just one pair. A pair is one for the SS-50 and one for the SS-30. I want 18 USD + shipping from Sweden for a pair of bare boards (no connectors included)...

Is there a terminal program that can handle the reader run signal and send just one character per reader run pulse? The reader run signal can be connected to the DSR signal. I think I have read that someone had such a program but I cannot find it now.

I have a couple of older M7261, Etch C Rev F boards. Chips have dates codes in the late 71 - early 72 range so it is a quite early 11/05. The machine is completely dead with this board installed. The problem is that these boards differs quite a lot from later etches so the existing schematic are...

I am looking for a DEC BCC03 cable that go between the VT240 base and the VR241 monitor. It was possibly also used on the DEC Professional and the DEC Rainbow.

I seem to remember a thread where some one was able to remove the platter with hub from a RL0x disk with the purpose of cleaning the upper surface. I think he did something withe handle but I cannot remeber the details neither can I find the thread. Anyone that remembers?

Looking for 3.5 to 5.25 inch drive bay brackets with black front that has a LED in it. Something like this: Anyone has something similar?

Any IBM RT PC owners out there? I have an IBM RT PC that I would like to get working. It is a 6150 tower. I also have a megapel board, the 5081 screen, keyboard and mouse. Many years ago the battery was removed and it was started up. The LED indicators stopped at the hard disk step...

I am looking for a NS32032-10 chip for my Opus 110 board.

What kind of keypad is this? It is a VT52-AF terminal. Does anyone have the missing keytop that I can buy / trade for something?

I am trying to create a TADP image to run with my TU60 connected to an 11/10 (to act as a loader for SPCWAR.LDA file). But I cannot find any XXDP image which has the CT driver. Malcom has cassettes listed on his webpage which looks like they might contain a TADP but I am not sure if they ever...

I am investigating why IOX-11 sometimes get stuck. This is part of my SPACEWAR project where I have gotten the old SPACEWAR code that Bill Seiler wrote in 1974 running on a PDP-11 with a AR11 card. The background is that I though it would be useful to have a single binary that could be loaded...

I have a small PDP-11/04 that is in the BA11-L chassis. 5,25 inch high. It is missing the rear mounting brackets. Anyone has a BA11-L rackmounted that can take som photos?

I have one BA08s coming with the PDP-8/L machine I have and I wanted to use my machine with a vectorscope of some sort so when I saw a KV8/L option on Ebay I jumped on it. The BA08 manual says that the KV8/L and VC8/L option is mutually exclusive. It lists the card position for the VC8/L but not...