IMS IMSAI 8080 User Manual page 33

OCTAL
ADD. INST.
000 000 257 0000
001 147
333
002
003 377
004 157
005 371
006 257
007 201
010 302
011
023
012 000
013
123
014 333
015 377
016 137
017 252
020 302
021 041
022 000
023 071
024 322
025
006
026 000
027 170
030 007
031
107
032 323
033 377
034
257
035
117
GAME PROGRAM LISTING
HEX
ADD. INST.
AF
01 67
DB
02
03 FF
04 6F
05 F9
06 AF
07 81
08 C2
09 13
OA 00
OB 53
OC DB
OD FF
OE 5F
OF AA
10 C2
11
21
12 00
13 39
14 D2
15 06
16
00
17 78
18 07
19 47
D3
1A
IB
FF
1C
AF
ID 4F
DESCRIPTION
MNEMONIC
XRA, A
.Exclusive OR A to itself (put zero in A)
MOV H, A
Move A to H (put zero in H)
Input data
INP
from front panel switches
Move A to L
MOV L, A
Put HAL regjnto SP
SPHL
XRA, A Exclusive OR A to itself (put zero in A)
Put C in A, affecting flag bits
ADD C
JNZ Jump if not zero
(skip switch test for debounce after a switch change)
i f NORMAL, CONTINUE
Move E to D
MOV D, E
Input data
INP
from front panel switches
Move A to E
MOV E, A
Exclusive OR D to A
XRA, D
Jump if result not all O's
JNZ
(change display if switch position changed from last time)
IF SWITCHES UNCHANGED, CONTINUE
Add SP to HL
DAD SP
JNC Jump if no carry results
(return to read switch loop if no carry yet)
IF CARRY, CONTINUE
MOV A, B
Move B to A
RLC
Rotate left 1
MOV B, A
Store A in B
OUT
Output A
in front panel lights
XRA, A
Exclusive OR A to Itself (put zero in A)
MOV C, A
Move A to C (Reset debounce indicator)
General Assembly and
Test Instructions