On Thu, 27 Dec 2001, Paolo Alexis Falcone wrote:
>
> Was the USCD p-System an OS that natively runs a Virtual Machine design
> for its layered approach and security model? I remember the term p-code
The operating system itself was written in p-code.
> for this was mentioned in some docus in the Linux documentation
> project on arguments re: compiled vs interpreted vs hybrid PL's (they
> used it rather than relying on the Sun terminology of byte-code).
>
strictly speaking, writing programs in p-system requires compilation into
p-code, and hence is semi-interpreted, very similar to basic interpreters,
except that it's faster and even efficient.
What is nice about the p-system is that you don't have to swap floppies
as in CP/M. It will make use of all available drives and will locate the
required files by itself. (Hard disk were hard to come by in those days).
Luckily I had 4 disk drives and 2 128K RAM card...one of which was
configured as a ram disk. The p-code vm is loaded into the 16K ram card,
giving you 48K of memory for working.
_
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