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1.3 LESSON

FILE INFORMATION

FILENAME(S): 1.3 LESSON

FILE TYPE(S): PRG

FILE SIZE: 9.8K

FIRST SEEN: 2025-11-30 21:06:57

APPEARS ON: 3 disk(s)

FILE HASH

2f145e0574a22f56d0cd4b26fc5f0e74d63b1969038f65b56f84da2c5a2c57b4

FOUND ON DISKS (3 DISKS)

DISK TITLE FILENAME FILE TYPE COLLECTION TRACK SECTOR ACTIONS
COMM ASSEMBLER 1.3 LESSON PRG DuncanTwain 13 0 DOWNLOAD FILE
C64 HULP 36 1 1.3 LESSON PRG DuncanTwain 13 0 DOWNLOAD FILE
ASSEMBLER CURSUS 1.3 LESSON PRG DuncanTwain 13 0 DOWNLOAD FILE

FILE CONTENT & ANALYSIS

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00002750: 54 28 7B 17 8E 00 00 00  4F 92 99 42 45 45 4F 4F  |T({.....O..BEEOO|
00002760: 30 00 00                                          |0..             |
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2024:."............REM W.OWEN MURCOTT FE
BRUARY 1983            WOMFIS 64.\....50
:MLA....2..:.C$(3):C$(0)."..............
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             ":L$."......":F$."IN BINARY
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THE EFFECT OF  ...  ".#.D.CC.6:.5000:.G(
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1.3  BINARY ARITHMETIC":T.4:.1000:.6000.
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12:.5000:."...BINARY ADDITION...I.."...L
ESSON 1.2 SHOWED A BINARY COUNTER,...J..
"ADDING 1 AT A TIME.":T.3:.1000.E.L.."..
.EXPLORE THE RULES.":T.2:.1000...M..".TY
PE IN 0S AND 1S AND SEE THE RESULT.":.".
.RETURN. = STOP..P.R.Z1.0:."."L$L$L$E$E$
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.56039,11...S..1200:.Z$.G(13)..".";:.111
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.5000:."....NOTE THE RESULT OF 1 + 1:":T
.2:.1000.N....".A BIT IS CARRIED INTO TH
E NEXT POSITION.":.1000......"THE COUNTE
R DID THIS IN LESSON 1.2":.1000.O...."..
.THE COMMODORE 64 ARITHMETIC REGISTER IS
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HE     ACCUMULATOR.":T.4:.1000.Z....".IT
 CAN START AT ANY VALUE; ADDITION IS  NO
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LE BYTES ARE ADDED COLUMN BY COLUMN..P..
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ADDITION!).":.1110:.Z.220,200.Q.,.CC.12:
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S BEING ADDED.";:T.2:.1000...-.."..THE F
IRST NUMBER WILL BE LOADED INTO THEACCUM
ULATOR.  THE SECOND";......" WILL BE ADD
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N ATA TIME....1.T.6:.1000:."..TO SUBTRAC
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.ON TRYING NUMBERS YOU MAY DISCOVER THAT
.`...."SOME GIVE WRONG ANSWERS WHEN A RE
SULT IS";......"TOO BIG TO FIT 1 BYTE.":
T.5:.1000.M...."..IF YOU DID NOT SEE THE
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....1000:.".."," 128 + 128":T.1:.1000:."
.","   1 + 255":.1000.:....".","-128 - 1
28":.1000:."."," 100 + 200..O....1110:.Z
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 .C. ARE THE NAMES OF TWO FLAGS IN.U....
"THE 6510 MPU WHICH SIGNAL O.V.ERFLOW AN
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CCURS WHEN THE SIGN IS CHANGED";.C...."'
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"1 + 127.":.1100.Y. .CC.15:.5000:M$.".."
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60......".";:.1110:.Z.410,400.'....".."L
$"CARRY OCCURS WHEN 9 BITS ARE NEEDED TO
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T.3:.1000......L$P$"1 + 255.":.1100:N1.1
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ESSING MULTI-BYTE ...'..".OPERANDS.":T.2
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 AND YOUR PROGRAM";...).."SHOULD CHECK T
O ENSURE CORRECT RESULTS.":T.4:.1000.=.2
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Y AND .C.3.."OVERFLOW CONDITIONS.":T.3:.
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C COULD BE":."WRONG!.":.1100......4000:.
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AL NUMBERS":.".FIRST ";:.40:N1.E(Z$).C"M
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LESSON 1.3 : BINARY ARITHMETIC.A%B.."..T
HIS LESSON EXPLAINS THE RULES FOR"..%L..
"ADDING AND SUBTRACTING BINARY NUMBERS."
:T.4:.1000.E%V..B$"..THE RULES OF ADDITI
ON;":T.2:.1000..%...B$".SUBTRACTION BY A
DDING 2S COMPLEMENT";:.1000.'&...B$".CAR
RY FROM COLUMN TO COLUMN.":.1000.Y&...".
..IT INTRODUCES THE CONCEPTS OF CARRY AN
D"..&..."OVERFLOW, DESCRIBING:":T.4:.100
0..&...B$"..WHAT CARRY SIGNIFIES AND WHE
N IT.N&...B$"CAN BE IGNORED;":T.2:.1000.
.&...B$".RECOGNISING OVERFLOW;":.1000..'
&..B$".CONDITIONS FOR CARRY AND OVERFLOW
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3:.5000:."...SUMMARY..'..."..THIS LESSON
 HAS COVERED:":.3030..'...53280,CC:.5328
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