AW: When did Memory- and IO Protection Emerge (Esp. in Minis)?

[Curious Marc]

> Marc wrote...
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> My 1974 HP 21MX, descendant of the HP 2100A, sure inherited this Memory Protect card. One register that you load, prevents access to any memory below the address of the register.
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> That's just the fence register (memory access interception) capability. There's also the I/O & HLT instruction interception, interrupt interception,  etc. mentioned earlier. [...]
> J
Yes, I didn't know it was more comprehensive. I just learned it from this thread! Is this a good message board or what...
Marc