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CRT
and Cassette Code (Cont'd)
IS
I 5-I I
8080/8085
ASSEMBLER,
\/1,
8
8085
SERIAL
I/O
NOTE
APPENDI:~
1100ULE
PAGE
4
LO(:
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SEQ
SOURCE
STATEMENT
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102
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104
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213
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106
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111
112
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114
115
116:
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118
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121
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122
122
124
125
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127
128
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POP
POP
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RH
H,
,~
C,R
e
COi
H
e
,:
SET
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~HLL
EVENTUALLY
BECONE
A
STOP
BIT
,:
ROTATE
CHARACTER
RIGHT
ONE
BIT,
;
\,
MOVING
NEi<:T
r,ATA
BIT
!NTO
CARRY
,;
CHECK
IF
CHARACTER
(At-I[i
STOP
BIHS)
DONE
,:
IF
NOL
CdJTPlIT
ClJRRENT
CAF.:R'r'
,:
RESTORE
STATUS
AND
RETURN
CC!N';OL
INPUT
SUBROUTINE
HAITS
FOR
A
r::E'r'STROKE
AND
PET!JP.NS
~JIiH
:3
8ITS
IN
PEG
C
DI
PUSH
H
1'11l!
PIN
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PAP
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enSI
.:
C'AT"
BITS
TO
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(LAST
F.:ETURNED
IN
CY)
:
HAIT
FOR
s'me
BIT
TRANSITION
H
CIi
HALFBiT
L
.'
;·JAIT
UNTIL
MIOfU
OF
START
BIT
C!2
H
C!2
8 I
TT
Hlf
.;
HA
IT
OUT
BiT
TH'lf
L
l'!4
H
CI4
CIS
H
:
CHECr:
S
IL'
L
WE
LEVEL
:
C'PTA
BIT
IN
CY
.
CHERrmlE
IF
THIS
IS
FIRST
STOP
BIT
,:
! F
SO.'
JUt1P
OUT
OF
L.OOP
.
ELSE
~OT'lTE
INTO
PHHIHL
CHARACTER
IN
C
'ACe
HOLl'S
UP[iATEO
CtlARACTER
..
E(llJALI2ES
COUT
AND
CIN
LOOP
TH'lES
;
CHARAC
rEF.'
CO~lPLEiE
14"
: '!"+"H"H't':t-'r:t-:+ +",""n"r"'f'Ho:
f·H·+
..
h·~:·h
..
t:·i<:+·f:t':H':+
..
f*';t':H·f:n·t:'f.:n
>t:h;;-'+:ljo,'"
H:,t:!t';f.****:+::t:**'>j-.:i<·+:*
148
149
,;
THE'
FC'L.!..mm·jG
II)['E
IS
USEr',
E','
THE
CASSETTE
INTERFACE.
lSi!
'
SUE:RO!)TINES
TAFE'
AN['
THPEIN
ARE
USEC;
RESPECTIVELY
151
TO
OUTPUT
(IF
RECEI'.,.'E
AN
EI!3HT
Bli
!.WTE
(iF
[lRTA,
REGISTER
C
15::'
40LPS
T~E
DAT~
IN
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CAS£:
~:EGi5TERS
M.,
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S.C
ARE
tiLL
OEST~:O'r'E(;.
1S:
rS!)·iO
FOI!
154
HALFC'r't"'
EC'U
nHCE
THE
Ni.i~lBER
OF
CYCLES
PER
TONE
BURST
(:OETEPf'HNES
TONE
FRmJENC~!
A1-51