Seeing that picture of the acoustic delay line unit opened up almost made me cry.Why you may ask? My dad was an IBM CE and used to bring home bits of dead System 360 for us kids to gawk at, this delay line being one of them. My brother and I opened up the unit and of course it wasn't long before we had the beautiful shiny gap-spaced coil of nichrome(?) wire unravelled and stretched into a twanging wire, then (I can't remember) probably chucked in the bin...As for the System/23, I had a dead motherboard from one, beautifully made with about a 5-layer PCB I think. I may be mistaking it for another IBM board but I have a notion the dynamic ram chips on it might have been double-decker stacked, and I wondered how they differentiated addressing the chips that way. Thinking about it now I suppose they could have had an inverter added to one of the pair, but that would mean having a slightly different die for each one.
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I see pattern types and view types as the way we can make Rust’s borrow checker story even better. Both by removing the fundamental tradeoff between runtime checks vs memory safety (pattern types). As well as making even more valid borrows expressible (view types).