HP 1000 double integer instructions info
J. David Bryan
jdbryan at acm.org
Sun Aug 13 17:51:52 CDT 2006
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
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.
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