7 Mar
2011
7 Mar
'11
6:38 p.m.
Hi
The NC4000 had multiply/divide/squareroot steps
The divide was non-restoring and required one extra
step to get the last bit right.
The NC4000 had an efficient step repeat instruction that
made these operation only two instructions( except
the divide restore was 3 if needed ).
These were integer instructions. The NC4000 came
out about the same time as the 386 as I recall and
was a uProcessor. It was programmed in Forth as its
native instructions and was often used as an excelerator
board in PCs. Later it was bought by Rockwell and
sold as the RTX2000. These were used in many
space applications because it was static CMOS and could
be easily rad hardened.
Dwight