Instruction manual

"-
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--
,,",
IT EMULATES
SYM PROGRAM USES
X
IRESTORE BIT CTR
IDi;CREHDlT 1T
IFF SHIFTED 8x-ee
IRESTORE X.Y,DATA BYTE
ICOUNT HALf CYCS Of Hf
IASSUME BIT IS ONE
I--~DUMHY
I---INVERT OUTPUT
IPAUSE fOR 218 USEC
ICOUNT HALf CYCS
IBIT IS ZERO
;---DUMMY. REALLY
1--- INVERT OUTPUT BIT
IPAUSE fOR 138 USEC
I ---RESTORE X
1--- AND Y
I BUMP HI BYTE
I RESTORE ACC
IZERO CHECKSUM
SOME UNECESSARY JUNCK
;Z.ERO CHECKSUM
I ---THATS WHAT THEY NAHED IT
I---TURN ON TAPE RECORDER
HfPl
LfPI
LF2e
Hf
Sl8
Lf'2e
SIC
S27
TPBIT
TAPOUT
KlMBlT
TEMPI
TEMP2
SI9
TPBIT
TAPOUT
see
CHKL
CHKH
CHKL
CHKL
CHKTle
CHKH
LOOPI
Loope
TEMPI
TEMP2
LOY'
EaR'
STA
DEY
BNE
DEX
BNE
LOX'
BCS
LOX'
LOY'
EOR,
STA
DEY
BNE
OEX
BNE
PLA
ASLA
BNE
LOX
LOY
TYA
RTS
UPDATE CHECKSUM FROM BYTE IN ACC
TAY ISAVE ACC
CLC
ADC
STA
BCC
INC
TYA
RTS
LEAVING OUT
JSR ZERCK
JSR P2SCR
LDAI see
STA TAP EON
RTS
LOA'
STA
STA
RTS
THIS MOVES THE STARTING ADDRESS TO THE
RUNNING BUffER ADDRESS. THE WEIRD NAME
IS DUE TO THE NAMES Of THE LOCATIONS
WHICH WE ARE MOVING IN THE SYM BOOK
CHKTle.
ZERCK.
1--- VE NEED A OEL.AY FUNCTION. BECAUSE THE SYM PROG USES THE KIM
I CHAROUT ROUTINE WITH OUTPUT DISABLED TO DELAY (& WE CAN'T>
I
I-~- THIS ONE SHOULD BE 1/21 SEC, SINCE
1--- THE KIM CHAR OUT ROUTINE, WHICH THE
8E E311 DEL.AY. STX TEMPI I---PRESERVE
8C E411 STY TDfP2 I-~- AND Y
A2
Ie LOX' see 1---00 OUTER LOOP 256 TIMES
Ae IA LOOPI. LOY' TlME99 I---LOOP
88 LOOPI. DEY
oe FD BNE
CA DEX
De F8 BNE
AE E311 LOX
AC E411 LOY
6e RTS
I
,~-- CHKT •••
A8 CHKT.
18
60 Elll
80 EIII
91 13
EE E211
98
61
1--- START •••
21 e1T! START.
2e De II
At lie
80 5tCI
6e
A9 ee
80 EIII
80 E211
611
1--- P2SCR •••
I
I
I
1169 Ae 19
Hf:
116B 49 £5
1160 80 21ce
117e 88
HFPI.
1171 DI FD
1173 CA
1174 01 F3
1176 A2 18 I.,f.
1178 BI 12
II7A A2 IC
117C Ae 27 LF21l.
117E 49 E5
1181 80 alCI
1'183 88 LFPI.
1184 08 FD
1186 CA
1187 01 F3
1189 68
118A IA
118B 01 01
1180AEE311
1191 AC £411
1193 98
1194 61
1195
1198
119B
1190
119F
IIAe
IIA2
11A3
IIA5
IIA8
liAS
IIAC
I1AD
IIAE
IIBI
IIB4
11B6
IIB9
IIBA
IIBB
11 BE
I1CI
IIC3
II C6
IIC7
IIC9
II CC
IICf
Bl TS
I--~ GO UPDATE CHECKSUM
TIME fOR THIS LOOP 15 5Y-1
IBIT IS ZERO
I HS OR KIM?
;KIM TAKES BRANCH
18 BITS+START BIT
ITlI!I1NG
I
(ALVAYS>
IGET NEXT BIT (LAST IS e START BIT
I (BY 9 BIT LSR>
I---SHIfT HI NIBBLE INTO PLACE
I
AND OUTPUT HI NIBBLE fIRST
ICONVERT LO NIBBLE TO ASCII
;SAVE X " Y
IUSE ff W/SHlfTS TO COUNT
ISAVE BIT COUNTER
;---DUMMY fOR TIMING
;GET DATA BIT IN CARRY
IASSUME ONE
HODE
OUTCHT
TEMPI
TEMP2
CHAR
Sff
TEMP2
CHAR
Sl2
Hf
S24
B416B
B416
GETBIT
TEMP2
HEXOUT
SlIf
SeA
S9
TEMP2
CHAR
ON APPLE, SO NEXT INSTRUCTION IS DUMMY
TEMPI 1--- fOR TIMING
CHAR
TPBIT
TAPOUT I INVERT LEVEL
416 USEC PERIOD
TMI5el
A416
NOFLIP INOFLIP If BIT e
TPBIT IBIT IS I - INVERT OUTPUT
TAPOUT
USEC PERIOD
TMI5Ie-1
ILENGTH Of LOOP IS 5Y-1
A416
OUTBTH. LOX'
STY
STA
LEVEL.
LOA
GE1'BIT. LSR
EOR'
STA
fIRST
LDYI
DEY
BNE
BCC
EORI
STA
OF FIRST 416
8416. LOYI
B416B. DEY
BalE
DD:
SIIIE
LOY
RTS
NOFLlP. NOP
BCC
I~-- START Of VARIOUS CHARACTER OUT ROUTINES
I
I
IIe7 2C Eell OUTCTX. BIT
IleA Ie 47 BPL
I
10UTBTH -NO CLOCK
I ~ X DESTROYED
I MUST RESIDE ON ONE PAGE - TIMING CRITICAL
I
II ec A2 e9
lleE 8C E411
1111 85 EA
I -~-CANT READ
1113 AD £311
111646 EA
1118 49 E5
IliA 80 2ece
I HERE STARTS
IIIDAI47
III f 88
1121 De fD
1122 91 II
112449 t5
1126 80 21ce
I END
1129 AI 46
112B 88
112C Dfl FD
112E CA
112fOI£5
1131 AC£411
1134 61
1135 i:A
113691 fI
I
1138 28 ACII OUTBCX. JSR CHKT
113B 2C EIII OUTBTX. BIT MODE
113E 31 CC BtU OUTBTH I HS
10UTBTC ~ OUTPUT ONE KIM BYTE
1141 A8 OUTBTC, TAY ISAVE DATA BYTE
1141 4A LSRA
IIAla 4A LSRA
1143 AlA LSRA
1144 AlA LSRA
1145 21 4811 JSR
1148 29 IF HEXOUT. AND'
I I
AlA C9 IA CMP,
114C 18 CLC
1140 3e 12 BMI HEXI
114F 69 117 ADC, se7
1151 69 3e HEXI. ADC' S3e
I OUTCHT. OUTPUTS AN ASCII CHAR IN KIM fORMAT
I (MUST RESIDE ON ONE PAGE. fOR TIMING>
I
1153 8E E31/ OUTCHT. STX
1156 8C 1:411 STY
1159 85 EA STA
115B
A9 ff LOA'
115048 KIMBIT. PHA
liSE AD E411 LOA
116146 EA LSR
1163 A2 12 LOX'
I I 65 BI e2 BCS
1167 A2 24 LOX'
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