Revengineered ancient PDP-11 CPUs, originals and clones

[lelf]

https://github.com/1801BM1/cpu11

[ThePowerOfFuet]

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

Then etching with... what?

[kees99 → ThePowerOfFuet]

Oleum. Fuming sulfuric acid.

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

[wolfgang42 → kees99]

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%.

[vajrabum]

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

[c-smile → vajrabum]

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.

[musicale]

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

[edoceo]

Could one remake this system for QEMU ?

[rnd0 → edoceo]

We already have simh -what would be gained?