Microinstruction Summary - Xerox Alto I Hardware Manual

Alto Hardware Manual
FIELDS:
0-4.
5-8
9-11
12-15
16-19
20
APPENDIX A - MICROINSTRUCTION SUMMARY
RSELECT
21
22-31
ALUF
BS
Fl*
F2*
LOADT
LOADL&M*
NEXT
*High-order bit complemented by RDRAM and WRTRAM.
All subsequent numbers on this page are in octal.
ALUF:
0: BUS
1: T
2:
BUS OR T*
3:
BUS ANDT
*Loads T from ALU output
BUS SOURCE (standard):
0:
~RLOCATION
1: RLOCA TION ~
2:
None
(BUS~-I)
3:
(task-specific)
Fl (standard):
0: -
1:
MAR~
2: TASK
3:
BLOCK
F2 (standard):
0: -
·1: BUS=O
2:
SH(
0
3:
SH
=
0
BUS SOURCE (task-specific):
4: BUS XOR T
5: BUS+l*
6: BUS-l*
7: BUS+T
4: (task-specific)
5: ~MD
6: ~MOUSE
7:
~DISP
4:
~L
LSH 1
5: ~L
RSH
1
6:
~L
LCY 8
7:
~CONSTANT
4: BUS
5: ALUCY
6:
MD+-
7:
~CONSTANT
4.16 7
10:
BUS-T
11: BUS-T-l
12: BUS+T+l*
13: BUS+SKIP*
RAM
o
CPU KSEC,KWD EfHER Related
14: BUS.T*
15: BUS AND NOT T
16: UNDEFINED
17: UNDEFINED
3:
~SLOCATION
4:
SLOCATION~
~KSTAT
~KDATA
EIDFCT
+-SLOCATION
SLOCATION+-
Fl (task-specific):
0 4, 16 7 11 12
13
14
CPU KSEC,KWD EfHER DWT CURT DHT DVT
10: SWMODE
11: ·WRTRAM
STROBE
12:
RDRAM
KSTAT+-
13:
RMR+-
INCRECNO ELFCT
14:
-
CLRSTAT EPFCT
15:
ESRB~
KCOMM+- EWFCT
16: RSNF KADR+-
17:
STARTF
KDATA~
F2 (task-specific):
0 4,16 7 11 12
13 14
CPU KSEC,KWD EfHER DWT CURT DHT DVT
10:
BUSODD INIT EODFCT
DDR+- XPREG+- EVENFIELD EVENFIELD
11: MAGIC RWC EOSFCT CSR+- SEIMODE
12: DNS+- RECNO ERBFCT
13: ACDEST XFRDAT EEFCT
14:
IR~
SWRNRDY EBFCT
15: IDISP NFER ECBFCT
16: ACSOURCE STROBON EISFCT
17:
-
67
RAM
Related
(SWMODE)
WRTRAM
RDRAM
SRB+-
RAM
Related