piclist 2000\11\09\175714a >
Thread: external program code on a memory chip
www.piclist.com/techref/ubicom/lib/mem/index.htm?key=memory
face picon face BY : jamesnewton@spam_OUTpiclist.com



Its actually two languages, XPL0 is sort of Pascal like (similar to JAL) but
it compiles to a byte code called I2L which is interpreted by the chip.

http://www.sxlist.com/languages.htm

http://www.sxlist.com/../language/xpl0

Loren Blaney and Richard Ottosen have ported the I2L byte code interpreter
to the SX from the original code written for the 6502 by P.J.R. Boyle, Wayne
Wall, Ted Dunning, Loren Blaney, Larry Fish and Richard Ottosen. I2L is
pretty cool and the license is GPL...

There are also ports for the "8080, 6800, PDP-10, IBM-360, a homebrew
machine, 65802, 680x0, PIC, Scenix, and the 80x86 family used by the PC"
(support for SVGA and mice available for the PC), so you can run a (minimal)
XPL0 program (binary) on at least 8 (very) different processors. Its sort of
like Java, but GPL'd and not that complex.

But that's really not the point. Again, the major advantage that I can see
is that you can have a little bit of very fast code doing hardware related
things and a bunch of slower code (via external serial flash or FRAM) doing
general purpose things.

I have a 10-MAR-2000 Version 1.02 copy of the port (it's written for MPASM
so could even be used on a large PIC) from Richard and Loren
http://www.sxlist.com/xpl0/I2L.ASM

I hope that they don't mind that I've posted it at sxlist.com

---
James Newton
1-619-652-0593
.....jamesnewton.....spamEraseMEsxlist.com
SX FAQ: http://www.sxlist.com


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