files@willett.UUCP (Mailed File Repository) (12/20/89)
Message 117 Tue Dec 19, 1989 DANMILLER at 23:03 CST r.berkey asked in cat 3 topic 31 what a complex carry was in reference to rtx literature? Can anyone help? Also, we have posted a few messages in cat 3 t 31 about for next vs do loops on the rtx and in cat 3 t 3 that probably ought to be in this category. Finally, I got my issue of the rtx express newsletter which included a sample add for the rtx processors. Looks like they are very serious about activly promoting these. RTX products now include a milstd883C part for military /aerospace applications called the rtx2000GM-8/883 , The RTX-C c cross compiler , rtx2000 chip, rtx2001, rtxds development station, rtx-db10 or 8 development boards, rtxds development software, rtx memory expandsion kits for the development stations. New products to be introduced are listed as a native rtx forth, rtx2152 2 M baud Uart, nd rtx--tasker a real time preemptive, priority based interrupt driven multitasker for the rtx2000 and 2001. These are listed as to be available 2nd quarter 90. Contest notes and forth literature, rtx hardware modules from 2 sources and RTX contest notes and a picture of the std bus size rtx contest board are included. ------------
ForthNet@willett.UUCP (ForthNet articles from GEnie) (01/05/90)
Category 6, Topic 15
Message 118 Sun Dec 24, 1989
F.SERGEANT [Frank] at 15:11 CST
Dan & Bob - re complex carry in RTX -
P. 18 of RTX 2001A data sheet, under "step divide" says "The contents of
TOP and NEXT are then jointly shifted left one bit (32-bit left shift), where
the value shifted into the last significant bit of NEXT is the value of the
Borrow bit on the first pass, or the value of the Complex Carry bit on each of
the subsequent passes.
P. 89 of the RTX Programmer's Reference Manual shows a diagram of an extra
single-bit adder whose carry-in is the regular carry-out of the ALU and whose
carry-out is the Complex Carry. Just which two bits are added by this extra
adder seem to depend on various factors including the particular instruction
being executed.
Apparently the complex carry is only of interest during the step math
instructions (& possibly only on divide?). The following pages of the Prog.
Ref. Manual give more information but that's all I feel up to digging out.
-- Frank
-----
This message came from GEnie via willett through a semi-automated program.
Report problems to: 'uunet!willett!dwp' or 'willett!dwp@gateway.sei.cmu.edu'