Where should the type information be 184
Yes, though the heat might be more of a problem than the magnetic flux. In...
fOn Wed, 20 Apr 2005 15:38:02 -0700 in alt.folklore.computers, glen
MMU mapping (and interrupt handling) was done in kernel mode, on CPUs and OSes that supported kernel and user modes and register sets: some PDP-11 OSes gave each user process the full 64KB (some CPUs-OSes supported 64KB each I+D: UNIX, RSX), and some also supported supervisor mode libraries with the same address limits in another address space(s).
The MMU registers were virtual memory mapping registers on a system where virtual was limited to 64KB-address space and real memory could be up to 4MB. Transparent overlay library mechanisms allowed the maximum volume of code to use the available virtual address space (and was available on many DEC systems), and IPC mechanisms allowed work to get done using multiple processes.
Discovered I could still write PDP-11 buttembler, 15 years after last use, when a kid had a problem finishing a comp arch buttignment, using gas with an emulator, instead of MACRO-11 with hardware. Helped that gas adopted and expanded the PDP-11 buttembler instruction and addressing model to other architectures.
That is what he thinks he wants. Examine the problems he has and the thinking path he took to suggest...
-- Thanks. Take care, Brian Inglis Calgary, Alberta, Canada
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Where should the type information be 185
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