Xerox 550 User Manual

next sequential register after register 15 is register 0). The
number of registers to be stored is determined by the value
of the condition code immediately before execution of STM.
(The condition code can be set to the desired value before
execution of STM with LCF or LCFI.) An initial value
of 0000 for the condition code causes 16 general registers
to
be stored.
Affected: (EWL) to (EWL+CC-l)
(R)-EWL, (R+l)- EWL+1, ... , {R+CC-l)-EWL+CC-1
The STM instruction may cause a trap if its operation ex-
tends into a page of memory that is protected by the access
protection codes or the write locks. A trap may also occur
if the operation extends into a nonexistent memory region.
If the effective virtual address of the STM instruction is in
the range 0 through 15, then the registers indicated by the
R field of the STM instruction are stored in the general reg-
isters rather than main memory. In this case, the results
will be unpredictable if any of the source registers are also
used as destination registers.
STCF STORE CONDITIONS AND FLOATING
CONTROL
(Byte index alignment)
STORE CONDITIONS AND FLOATING CONTROL stores
the current condition code and the current value of the
floating round (FR), floating significance (FS), floating
zero (FZ), and floating normalize (FN) mode control bits
of the program status words into the effective byte location
as follows:
Affected: (EBL)
(PSWs)0_7 -EBL
ANAL VZE/INTERPRET INSTRUCTIONS
ANLZ ANALYZE
(Word
index alignment)
o 1 2
II I
I
R " X ! Reference address !
7 8 10 11 12 13 14 15116 17 18 19120 2' 22 23/24 25 26 27/28 29 30 31
ANALYZE evaluates the effective word as an instruction.
The ANALYZE instruction always sets the condition codes
to indicate the addressing type of the analyzed instruction
(see condition code settings and Table 6). Except when
56 Anaiyze/lnterpret Instructions
Table 6. ANALYZE Table for Operation Codes
Xln
l
XIOOI+n
X
'
20
'
+n
X
'
40
'
+n
X
'
60
'
+n
00
-
AI
-
-
01
-
CI
=CD
tt
-
02
LCFICV
tt
LI
-
03
-
MI
-
-
04
CAll
SF
ANLZ
BDR
05
CAL2
S
CS
BIR
06
CAL3
LAS
XW
AWM
07
CAL4
-
STS
EXU
08
PLW
CYS
EOR
BCR
09 PSW
CYA tt
OR
BCS
OA PLM LM@
LS
BAL
OB PSM
STM
AND
INT
OC
PLS
t
LRAt SlOt
RDt
OD
psst
LMst not
WDt
OE
LPSDt@tt
WAITt
TDyt
AIOt
OF
XPSD
t
LRPt
HIOt
MMC
t
10
AD SW
AH LCF
11
CD CW
CH
CB
12 LD LW LH
LB
13
MSP MTW
MTH
MTB
14
-
LYAW
-
STCF
15
STD STW
STH
STB
16
-
DW
DHG)tt
-
17
-
MW MH
-
18
SD
SW
SH
-
19 CLM
CLR
-
-
1A
LCD
LCW LCH
-
1B LAD
LAW LAH
-
1C FSL
FSS
-
-
,1"'\
~ A I
rAt"
-
-
IV rML
rM~
lE FDL
FDS
-
-
IF FML
FMS
-
-
tp··1 d· t .
nVI ege inS ruchons.
tt Decimal value of condition
code settings when an-
alyzed instruction calls for direct addressing.
If an-
alyzed instruction calls for indirect addressing, add 2
to
the va I ue shown.
the analyzed instruction is an immediate operand in-
struction, an effective virtual address for the analyzed
instruction is also calculated and loaded into register R.

Xerox 550 Specifications

General

Brand	Xerox
Model	550
Category	Printer
Language	English