Speed now & then (Space and time?)
bfranchuk at jetnet.ab.ca
Wed Apr 11 19:42:30 CDT 2018
On 4/11/2018 5:47 PM, Paul Koning wrote:
> I haven't tried pcc, but supposedly that has been ported to the PDP-10, so presumably it can be ported to an 18-bit machine too.
Well the original C mostly just and 8 bit bytes and 16 bit ints, with
floating point for good luck. Now who knows what it needs.
But the good (old) news is you still can get the original C compiler for
> You could try gcc; creating a simple back end is not all that hard. And while it makes no attempt to support non-multiple-of-8-bit machines, it can be forced to, after a fashion. One time for grins I banged together a very primitive CDC 6000 back end. It wasn't correct but it wasn't horribly wrong...
> 18 bit Unix, not sure about that one. It was originally done on a PDP-7 but I think that was before C and it's no longer around that I know of. Still, older versions might be somewhat portable.
Disk I/O needs be word size aligned so I guess 16 bit unix (if you could
use it, curse you bell labs) could be ported providing you don't have
nasty tricks to 18 bit I/O.
> Does it have to be Unix? For a simple character environment, Forth is nice and it's very easy to port to pretty much any computer.
Unix was the only thing I can think of that is character I/O , device
drivers and on 16 bit cpu written
in a high level language.
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