Hi all, I have uploaded the kernel source of 32 bit PCS MUNIX 1.2 to https://github.com/hveit01/pcs-munix. MUNIX was an AT&T SVR3.x implementation for the German PCS Cadmus workstations in the 80's. They were based on Motorola 68020 CPUs on a DEC QBUS. The interesting feature of this kernel is the integration of the Newcastle Connection network (https://en.wikipedia.org/wiki/Newcastle_Connection) which I found, beyond a tech report https://assets.cs.ncl.ac.uk/TRs/175.pdf, no further references for. The kernel source was reverse engineered and verified (see readme in the distribution who this was done) from the binary tape at ftp.informatik.uni-stuttgart.de/pub/cm/pcs/sw/IS0371P.tap (Computer museum of the University of Stuttgart), and to my knowledge reveals the Newcastle connection code for the first time in a commercial Unix. The Github package includes the kernel sources, i/O drivers, several standard libraries, the disassembled boot ROM and for reference, two of my tools, a partial syscall emulator pcsrun which allowed me to run the C compiler and other native binaries outside the PCS hardware/Unix environment, and a disassembler pcsdis for the specific COFF dialect (note that IDA will produce garbage without a specific patch). Regards Holger