🚀 go-pugleaf

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I speak with authority. I have used TOPS-10 for 8 years as a systems 
programmer, and CP/M for 5-6 years. I have used RSX11M for 5 years, and have 
seen RT-11 in use as well.  CP/M looks like an early offshoot of TOPS-10 (
TOPS-20 was quite quite different), however the resemblance to RT-11 is also 
quite close: DEC was aiming for a compatible interface even then.  The idea 
that every command was a program was certainly more akain to RSX11M than to 
TOPS-10 or RT-11 (TOPS and I think RT-11 both had a command table, and the 
RUN command was used to start an arbitary program), however this was a 
sensible idea on a smaller machine (it was avoided under TOPS-10 to speed up 
command interpretation). TOPS-10 provided a virtual address space mostly 
devoid of operating system routines which looked very like a small computer: 
we used to joke that a DECsystem-10 was a 100 RT-11 systems in a concrete 
mixer.  I say that CP/M was an early offshoot of TOPS because the more 
developed TOPS system provided 'ersatz devices' and PATH concepts more akin 
to MS-DOS.


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