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Addendum notes. Thinking about the question of using standard I/O functionality (READ/WRITE line at a time in Fortran): if you have a device that keeps chucking data at the system and there is way to control the flow, then things may overrun if the application cannot deal with things fast...

It looks like the NOYITO device transmits a set of 10 readings at regular intervals, the default being every 500ms (it implies that this can be changed). How trivial it will be to read from it in a Fortran/BASIC program running on RT-11 running on SIMH is going to depend on a number of...

Another potential issue is that not all quad width QBUS backplanes are "suitable". The M8189 (11/23+) does not appear to be QBUS/QBUS, but QBUS/CD, and should probably be in the first slot on a compatible backplane...

I am not sure; but the videos (starting with "tape 1") may be on YouTube here: Source reference: https://news.ycombinator.com/item?id=15056604

I think "spares or repair, or use by" sale/exchange with enthusiasts seems like a wonderful way to go (assuming you don’t want to keep it yourself)! Missing paddle on the DEP switch: if you can’t source an original, then a 3D printed one with appropriately coloured enamel paint (1K or 2K) is...

RAL Classic colour selections I have compared the switches in my possession (see previous post) to RAL Classic swatches and my opinion for the best visual matches would be (see caveat below): Amber: RAL 1007 (RAL 1006 and RAL 1037 would be the next best matches; or maybe even "just as good")...

An update. The second half of the following is mostly about "RAL Design" colours and the use of paint. See also: "freebies". RAL Classic: there aren't sufficiently good (in my opinion) matches; there aren't that many RAL Classic colours. I will retest RAL Classic again and tabulate the "best"...

Core repair/ The photos are from a cheap "digital microscope" bought via Amazon (similar items available on eBay). The cores on the H-212 are very tiny and tightly packed together compared to older core memory examples (things get smaller and denser over time) - see photo below! I imagine it...

A quick off-the-cuff thought for a low cost solution. I have not researched the practicalities; but if I owned the machine and it was in this situation then this is one option I would definitely explore before giving up! Modify the address handling logic at the OMNIBUS side so that the bad...

Tom, Confirmed: 5 Ohm between E11 pin 9 and JT2. I measured 0 Ohm between E11 pin 9 and the 4th from right inner pad (red arrow in image) above E10 when E10 is towards you with E11 to the right.

Different colour resins of the right type can be mixed to get different colours; or dyed. I am still working on colours, when I have time, (WIP described elsewhere). In a non-scientific iterative mix-and-check with some generic resins I got something close to the amber handle's colour. It would...

Thanks for your hard work Vince. A difficulty of colours! I thought I would return to this subject and report what I have noted. Here are two useful resources on the subject of how humans perceive colour… it is worth watching the YouTube video to understand what is going on...

Below is an image of the "reprint" mentioned in my previous post. The white resin again (no dye this time; which was better). The red colour is plastic primer (I couldn't find the yellow acrylic spray to go on top of that - it was probably not PDP-8/e yellow anyway). Notes: Some artifacts of the...