This month's Linux journal has a great article on SIMH and running an emulation of Unix R5. I took a look at the simh.trailing-edge.com site and found that they also had an emulation of the old IBM accounting machines and a software kit for the SPS (Symbolic Programming System) assembler. SPS was the first language I ever learned (the second was Cobol), so this brought back memories.
For you other old timers, maybe you flipped switches on a MITS Altair 8800 - they have that, too. Lots of PDP stuff; this is an incredibly fascinating resource.
The young folk might want to pull down a little of this stuff just to see why we old timers are as grumpy as we are: this is the software that molded us. It could also be amusing to look at sources and see the beginning of security problems that are still with us today.
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