13 Aug
2006
13 Aug
'06
3:51 p.m.
On 13 Aug 2006 at 20:57, Holger Veit wrote:
Note that some of these codes are overlayed by the
Double integer
instrs. Actually, on the F the DBI instrs are scattered over multiple
locations;
Yes, part are in the FP area, the rest in the FFP area. I'd guess that's
because the E-Series microcode for both became much smaller when it was
adapted for the F-Series hardware floating point box. So HP reused those
emptier areas (and ROMs), rather than allocate a new block from the "HP
Reserved" microcode spaces.
C-2, in constrast contains much more opcodes, several
of which I
haven't yet identified completely.
Which ones? Note that the A-Series added a lot of new instructions for the
new hardware, e.g., code and data separation (CDS) instructions.
You might also look at the 5950-3767 M-E-F CE handbook
(bitsavers) on
pp 11-22 ff. which also lists the SIGNAL/1000 opcodes.
Had already. :-) It has the F-Series opcodes for the double integer
instructions, but not the E-Series ones.
-- Dave