12 Apr
2018
12 Apr
'18
4:48 a.m.
On 04/12/2018 02:45 AM, Chuck Guzis via cctalk wrote:
On 04/11/2018 06:38 PM, Chuck Guzis via cctalk wrote:
Signed 8 bits would be? -128 to +127.
bill
On 04/11/2018 02:48 PM, ben via cctalk wrote:
Remarkably, Unisys
keeps a lot of old documentation around. Here's the
reference manual for their "C" on th 1100:
https://public.support.unisys.com/2200/docs/cp14.0/pdf/78310422-011.pdf
Looks pretty much like standard C until you get into the minutiae, such
as "A character constant is 1 to 4 characters" and page 4-4 "Data
Types"
(9 bit characters and 36 bit ints and 18 bit short ints).
So, it should be pretty straightforward unless you assume that a char is
8 bits, with a signed char having a range of +/-255.
I have a nice 18 bit cpu here, with only a few
hardware bugs.
Hmm would it work better if I change that around ideas.
Care to point to a nice 18 bit version of unix or C.
BTW The cpu has a frame pointer S but no S++ --S operations
so pushing and popping wild data is not a option.
Well, the Univac 1100/2200
series mainframes ran V7 Unix--and they're
36-bit machines, so probably not far from your 18-bitter--and they're
ones' complement machines.
Univac called it "SX1100", so you have a search term.