Revengineered ancient PDP-11 CPUs, originals and clones

> sample decapsulating, milling die from the plastic package with CNC, then etching with 104 percents boiling oleum

Then etching with... what?

Oleum. Fuming sulfuric acid.

https://en.wikipedia.org/wiki/Oleum

And apparently the percentage is strength relative to (non-fuming?) sulfuric acid (i.e. neat sulfuric acid without sulfur trioxide added) which is why it’s over 100%.

These are for Soviet clones of 11 microprocessors from the 80s I think?

1801BM1-3 were original Soviet micro-processors that used PDP-11 system of commands.

There were also series of SM-1 and SM-2 machines that were using system of commands compatible with Hewlett Packard HP-2000. SM-1 and SM-2 were using Soviet original DOS ASPO software - OS generated by special macro processor for particular hardware configurations.

It's great to see more historic hardware schematics, as well as runnable FPGA implementations of historic processors and systems.

Could one remake this system for QEMU ?

We already have simh -what would be gained?