2. Αποθήκευση Δεδομένων.pdf
Transcript of 2. Αποθήκευση Δεδομένων.pdf
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AND, OR, XOR (exclusive or) Boole
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AND, OR, XOR, NOT (inputs) (output) ()
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AND, OR, XOR, NOT (inputs) (output)
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flip-flop
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(output) flip-flop 11()
. 11
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(output) flip-flop 11()
. 11
OROR 11 , ANDAND
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(output) flip-flop 11
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11 ANDAND OROR 00
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flip-flop
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1 byte
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/ (RW)
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(format) CD
(track), (sectors)
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/
(R/W)
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(records)
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Hello. ASCII
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() ()
.
.
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100101100101
bit
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1. .
2. , .
3. , .
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13
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: bit map.bit map.
, pixels (picture element). pixel :
, (RGB RedGreenBlue). MB.
. vector.vector.
. .
, . (scalable fonts, ..
TrueType, PostScript) . CAD (Computer-Aided Design).
.
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0, 1.5, 2.0, 1.5, 2.0, 3.0,4.0, 3.0, 0
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101.101101.101
bit
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2. . . .
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--66 bits
66 bitsbits
--66 bitsbits
bitsbits 11
bits bits
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10 10
2 2
10 10
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(excess-8)
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bit
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Bit Bit
()()
BitBit
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2 5/8
2 2
bitbit
bitbit
Bit Bit
()()
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xyxxyzyxyxxyzy (5, 4, x)(5, 4, x)
. () 5 .. () 5 .
. 4 . 4 bitbit . .
. 4 . 4 bitbit . .
. . , . , .
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ASCII A F (odd parity)
ASCII ASCII A A
1 1
ASCII ASCII F F
1 1
( (pattern) pattern) 1 1
( (pattern) pattern) 1 1
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(error-correcting code)
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010100
AND, OR, XOR (exclusive or) Boole AND, OR, XOR, NOT (inputs) (output) () AND, OR, XOR, NOT (inputs) (output) flip-flop (output) flip-flop 1 () (output) flip-flop 1 () (output) flip-flop 1 flip-flop 1 byte (format) CD (records) Hello. ASCII () () 100101 13 0, 1.5, 2.0, 1.5, 2.0, 3.0,4.0, 3.0, 0 101.101 2 -6 bits (excess-8) bit 2 5/8 xyxxyzy (5, 4, x) ASCII A F (odd parity) (error-correcting code) 010100