I should add that I've done all of this using the s709 emulator from David Pitts (https://cozx.com/dpitts/ibm7090.html), using the eliza-ctss distribution from Rupert Lane (https://timereshared.com/). I'm sure both of these projects involved a massive amount of work, for which I'm incredibly grateful.
#retrocomputing #ibm #mainframes
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