SBC.D

FILE INFORMATION

FILENAME(S): SBC.D

FILE TYPE(S): SEQ

FILE SIZE: 755b

FIRST SEEN: 2025-11-02 16:39:56

APPEARS ON: 4 disk(s)

FILE HASH

4ba63d414181a1e58e38f8203544a719e9043748d07219d3f8cfbafb470ae434

FOUND ON DISKS (4 DISKS)

DISK TITLE	FILENAME	FILE TYPE	COLLECTION	TRACK	SECTOR	ACTIONS
1	SBC.D	SEQ	Treasure Chest - Plattfuss	24	5	DOWNLOAD FILE
U TILITES	SBC.D	SEQ	Treasure Chest - Wolfgang Rauprich	11	1	DOWNLOAD FILE
FREEWARE DISK NR	SBC.D	SEQ	Treasure Chest - Wolfgang Rauprich	11	1	DOWNLOAD FILE
OP CODE TUTOR	SBC.D	SEQ	High Voltage Complete C64 Collection	24	4	DOWNLOAD FILE

FILE CONTENT & ANALYSIS

00000000: 22 20 20 20 20 20 20 20  20 20 20 20 20 20 20 CF  |"              .|
00000010: 50 43 4F 44 45 3A 20 D3  C2 C3 0D 22 20 20 20 20  |PCODE: ...."    |
00000020: 20 20 20 20 20 20 20 20  20 20 2D 2D 2D 2D 2D 2D  |          ------|
00000030: 2D 2D 2D 2D 2D 0D 22 CF  50 45 52 41 54 49 4F 4E  |-----.".PERATION|
00000040: 3A 20 20 C9 54 20 49 53  20 20 55 53 55 41 4C 20  |:  .T IS  USUAL |
00000050: 20 54 4F 20 20 53 45 54  20 20 54 48 45 0D 22 43  | TO  SET  THE."C|
00000060: 41 52 52 59 20 42 49 54  20 42 45 46 4F 52 45 20  |ARRY BIT BEFORE |
00000070: 20 54 48 49 53 20 20 4F  50 45 52 41 54 49 4F 4E  | THIS  OPERATION|
00000080: 2C 20 20 4F 52 0D 22 50  52 45 43 45 44 45 20 49  |,  OR."PRECEDE I|
00000090: 54 20 42 59 20 41 4E 20  20 4F 50 45 52 41 54 49  |T BY AN  OPERATI|
000000A0: 4F 4E 20 20 57 48 49 43  48 20 20 49 53 0D 22 4B  |ON  WHICH  IS."K|
000000B0: 4E 4F 57 4E 20 54 4F 20  20 4C 45 41 56 45 20 20  |NOWN TO  LEAVE  |
000000C0: 54 48 45 20 20 43 41 52  52 59 20 20 42 49 54 20  |THE  CARRY  BIT |
000000D0: 20 53 45 54 2E 0D 22 D4  48 45 4E 20 D3 C2 C3 20  | SET..".HEN ... |
000000E0: 41 50 50 45 41 52 53 20  54 4F 20 53 55 42 54 52  |APPEARS TO SUBTR|
000000F0: 41 43 54 20 54 48 45 20  20 44 41 54 41 0D 22 52  |ACT THE  DATA."R|
00000100: 45 46 45 52 45 4E 43 45  44 20 42 59 20 54 48 45  |EFERENCED BY THE|
00000110: 20 41 44 44 52 45 53 53  49 4E 47 20 4D 4F 44 45  | ADDRESSING MODE|
00000120: 20 46 52 4F 4D 0D 22 54  48 45 20 41 43 43 55 4D  | FROM."THE ACCUM|
00000130: 55 4C 41 54 4F 52 2E 20  20 C9 46 20 54 48 45 20  |ULATOR.  .F THE |
00000140: 43 41 52 52 59 20 46 4C  41 47 20 49 53 0D 22 53  |CARRY FLAG IS."S|
00000150: 54 49 4C 4C 20 53 45 54  2C 20 54 48 49 53 20 20  |TILL SET, THIS  |
00000160: 49 4E 44 49 43 41 54 45  53 20 20 20 54 48 41 54  |INDICATES   THAT|
00000170: 20 20 54 48 45 0D 22 52  45 53 55 4C 54 20 44 49  |  THE."RESULT DI|
00000180: 44 20 4E 4F 54 20 27 42  4F 52 52 4F 57 27 2C 20  |D NOT 'BORROW', |
00000190: 49 2E 45 2E 20 54 48 41  54 20 54 48 45 0D 22 41  |I.E. THAT THE."A|
000001A0: 43 43 55 4D 55 4C 41 54  4F 52 27 53 20 20 43 4F  |CCUMULATOR'S  CO|
000001B0: 4E 54 45 4E 54 53 20 20  57 45 52 45 20 20 47 52  |NTENTS  WERE  GR|
000001C0: 45 41 54 45 52 0D 22 54  48 41 4E 20 4F 52 20 45  |EATER."THAN OR E|
000001D0: 51 55 41 4C 20 54 4F 20  54 48 45 20 44 41 54 41  |QUAL TO THE DATA|
000001E0: 2E 20 20 D7 48 45 4E 20  C3 20 20 49 53 0D 22 43  |.  .HEN .  IS."C|
000001F0: 4C 45 41 52 2C 20 20 20  54 48 45 20 20 20 44 41  |LEAR,   THE   DA|
00000200: 54 41 20 20 20 20 45 58  43 45 45 44 45 44 20 20  |TA    EXCEEDED  |
00000210: 20 20 54 48 45 0D 22 41  43 43 55 4D 55 4C 41 54  |  THE."ACCUMULAT|
00000220: 4F 52 27 53 20 20 43 4F  4E 54 45 4E 54 53 20 20  |OR'S  CONTENTS  |
00000230: 41 4E 44 20 20 C3 20 20  53 48 4F 57 53 0D 22 54  |AND  .  SHOWS."T|
00000240: 48 41 54 20 41 20 27 42  4F 52 52 4F 57 27 20 49  |HAT A 'BORROW' I|
00000250: 53 20 4E 45 45 44 45 44  2E 20 20 D7 49 54 48 49  |S NEEDED.  .ITHI|
00000260: 4E 20 54 48 45 0D 22 43  48 49 50 2C 20 C1 20 49  |N THE."CHIP, . I|
00000270: 53 20 41 44 44 45 44 20  54 4F 20 54 48 45 20 32  |S ADDED TO THE 2|
00000280: 27 53 20 43 4F 4D 50 4C  45 4D 45 4E 54 0D 22 4F  |'S COMPLEMENT."O|
00000290: 46 20 54 48 45 20 44 41  54 41 20 41 4E 44 20 54  |F THE DATA AND T|
000002A0: 4F 20 54 48 45 20 20 43  4F 4D 50 4C 45 4D 45 4E  |O THE  COMPLEMEN|
000002B0: 54 20 20 4F 46 0D 22 C3  2E 20 20 2A D4 48 49 53  |T  OF."..  *.HIS|
000002C0: 20 41 46 46 45 43 54 53  20 20 54 48 45 20 20 CE  | AFFECTS  THE  .|
000002D0: 2C D6 2C DA 2C 20 20 41  4E 44 20 20 C3 0D 22 46  |,.,.,  AND  .."F|
000002E0: 4C 41 47 53 2E 0D 22 0D  22 5A 5A 5A 5A 5A 0D 0D  |LAGS.."."ZZZZZ..|
000002F0: 80 0D 0A                                          |...             |

"              OPCODE: SBC."            
  -----------."OPERATION:  IT IS  USUAL 
 TO  SET  THE."CARRY BIT BEFORE  THIS  O
PERATION,  OR."PRECEDE IT BY AN  OPERATI
ON  WHICH  IS."KNOWN TO  LEAVE  THE  CAR
RY  BIT  SET.."THEN SBC APPEARS TO SUBTR
ACT THE  DATA."REFERENCED BY THE ADDRESS
ING MODE FROM."THE ACCUMULATOR.  IF THE 
CARRY FLAG IS."STILL SET, THIS  INDICATE
S   THAT  THE."RESULT DID NOT 'BORROW', 
I.E. THAT THE."ACCUMULATOR'S  CONTENTS  
WERE  GREATER."THAN OR EQUAL TO THE DATA
.  WHEN C  IS."CLEAR,   THE   DATA    EX
CEEDED    THE."ACCUMULATOR'S  CONTENTS  
AND  C  SHOWS."THAT A 'BORROW' IS NEEDED
.  WITHIN THE."CHIP, A IS ADDED TO THE 2
'S COMPLEMENT."OF THE DATA AND TO THE  C
OMPLEMENT  OF."C.  *THIS AFFECTS  THE  N
,V,Z,  AND  C."FLAGS.."."ZZZZZ.....

Visualization:

Width: Skip load address (+2) Invert

> CLICK IMAGE PREVIEW FOR FULL MODAL