Operating Systems

Operating systems (kernels, file systems, as well as device-driver code) with whose internals I’ve become familiar in the past include Linux, VAX/VMS, PRIMOS, TOPS-10, and MIT‘s ITS.

Programming languages represented by these internals (and my expertise) include C, PL/1, FORTRAN, and various assembler languages (including Pr1me’s 64V-mode instruction set, Digital’s VAX instruction set, Digital’s PDP-10 instruction set, and Numerix’ NMX-432 and NMX-464 128-bit VLIW instruction sets).

As the picture below indicates, I’ve used a variety of technologies over quite a period of time — including a KSR-33 Teletype acoustically coupled to a DECsystem-10 mainframe!