Help: PDP-11 instruction classification
wkt at cs.adfa.edu.au
Wed May 10 11:50:31 AEST 2000
In article by lars brinkhoff:
> So far, this is the classification I've come up with:
> BASIC: the basic instruction set.
> CIS: commercial instruction set (opcodes 0x7d00..0x7eff).
> EIS45: 11/45 extended instruction set: MUL, DIV, ASH, ASHC, SPL.
> EIS40: 11/40 extended instruction set: EIS45 + SOB, XOR, MARK, SXT, RTT.
> FIS: FADD, FSUB, FMUL, and FDIV (opcodes 0x7a00..0x7bff).
> FPU: LDF, STF, LDCFF', STCFF', CMPF, LDEXP, STEXP, LDCIF, STCFI, MULF,
> MODF, ADDF, SUBF, and DIVF (opcodes 0xf000..0xffff).
> Would this be correct?
> FIS and CIS isn't imlemented in Supnik's simulator, and I haven't
> found any documentation. Does anyone know more about those? Why
> is there both an FADD and an ADDF instruction?
I've got some details on FADD, FSUB, FMUL, and FDIV. I could fax you the
relevant details from the processor handbook, and/or give you source code
from my Apout simulator.
FADD is instruction 07500x, ADDF is 1720xx. They are different.
I don't know enough about the CIS extensions. Can you name some of the
opcode names, so that I can look in the handbooks I have here: 04, 05, 10, 15,
20, 34, 35, 40, 45, 55, 60, 70.
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