Old farts and new Linux
Gordon Keehn
gordonkeehn at netzero.net
Wed May 5 17:09:16 UTC 2004
Hugh Foster wrote:
> Commodore Pet for me - builtin tape drive - and then the mighty
> Sinclair Spectrum, then DEC/VAX... VAX/VMS was a sort of corporate
> LINUX, I suppose, take UNIX and rewrite it the way we like it. Then PCs,
> and now my toe in the Linux pool. And the young Oracle "programmers"
> sitting around me panic when they see a command prompt! :)
Actually, I believe VMS was a superset of RSX-11M (IIRC RSX stood for
Realtime System eXecutive). In another incarnation I had to write some
special interrupt service drivers for a multi-channel A-D converter hung
on a PDP-11/34. Cute once I discovered that the first thing you had to
do when the driver got control was DISABLE INTERRUPTS. Then next thing
was clear the interrupt (actually clearing a bit in the I/O page) and
then reenable interrupts. If you forgot the first step, in the time it
took to clear the bit, you blew the kernel stack as the ISR was driven
again, and again, and again, and ...
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