Dynex MAS281 cpu / McDonnell Douglass MDC281 (MIL-STD-1750A)

[Akira Erebos]

I'm unable to acquire a good photo of MAS281 microprocessor from Dynex Semiconductor, or at least McDonnell Douglass MDC281 processor (MIL-STD-1750A).

I know it is a long shot, but is there a chance that any collector here has this chip and a might be able share a good photo?

Or is there anyone who has ever photographed it in some aerospace museum?

MAS281 was 10 MHz 16-bit processor, with radiation hardening, and it was used in some ESA space missions at the end of the 20th century. Here is a datasheet.
https://datasheetspdf.com/pdf-file/403936/Dynex/MAS281/1

It was manufactured by Dynex Semiconductor, but it was a direct clone of the McDonnell Douglass MDC281.

This chip has a three separate dies and I am unable to find a good photo of it.

Only picture I could find is this stupid old advert, from a printed aviation magazine.



As you can see, there are several MDC281’s presented like a fucking French fries, and none of them is completely visible.

The only photo that partially shows how Dynex MAS281 might look is this ridiculous micro-image from the early days of the internet, which shows the SOHO spacecraft's computer system.



Although the image has like 5 pixels, it shows the MAS281 processor with three dies on the right, and it looks like it uses white ceramic, not gray/green like the MDC281.




Any better photo? Someone, please…

[CPUShack]

Somewhere there is a much better pic, in a powerpoint presentation IIRC, as someone was making a replacement for it and showing off the reduced part count

[CPUShack]

Here is one replacement
https://gemes.com/2020/07/24/another-f-15-success-story-from-the-microcircuit-emulation-center-with-ame-gem/

[yy2013]

Very interesting! I didn't even know such a chip ever existed.

[isa-d]

here is mine

[i440bx]

Super sexy pice of scrap <3

[Akira Erebos]

Oh, that's fantastic piece. Thank you isa-d.

At least this gives me a good look at the precursor.

I thought there was a chance that some collectors might have MDC281, because it was used in military avionics extensively.

Sadly, the European white MAS281 was probably primarily used in space missions, so the chances of similar luck are probably minimal.

But of course many thanks. It is a definitely nice piece.