008 | Text, Character Sets, ASCII, Unicode, UTF | AS A2 9618

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The video covers the following content:

- Character sets: ASCII & Unicode
- Standard (7 bits) vs Extended ASCII (8 bits)
- Fixed & variable-length formats: UTF-8, UTF-16 & UTF-32
- ASCII codes of some common characters
- Why some languages use more storage space

computer science, CS, 9618, AS, A-Level, A2, Cambridge, video, lesson, class, full syllabus, topicals, study guide, exam, preparation, revision, notes, curriculum, online

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Комментарии
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On vga text mode we can display up to 2 different character set at once using the same ASCII numbers 0-255 to select with or without bit 3 of the foreground color attribut byte and with using bios function for user character and combination function.

maxmuster
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For converting bits to hexadecimal we don’t need to count bits. We have only 4 bits at once multiple times. 8 bit = 1 byte. We can cut the byte in two pieces. High nibble + low nibble. From hex 00 - FF.

4 bits hex
0000 0
0001 1
0010 2
0011 3
0100 4
0101 5
0110 6
0111 7
1000 8
1001 9
1010 A
1011 B
1100 C
1101 D
1110 E
1111 F

maxmuster
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I use ASCII + extended ASCII character only on vga text mode.

maxmuster
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ASCII ART is not very pixel precise. I like to use PIXEL ART within a block of character with changing the pixel of the character with 8x16 size.

maxmuster