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Jet Hughes
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@ -11,7 +11,7 @@ sr-ease: 230
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[memory](notes/memory.md)
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[unicode](notes/unicode.md)
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[ASCII](notes/ASCII.md)
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[characters](notes/characters.md)
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[digital-data](notes/digital-data.md)
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@ -1,28 +0,0 @@
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---
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title: "ASCII"
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aliases:
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tags:
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- cosc204
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---
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# ASCII Character Code
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1. The computer uses ch as a integer index into a pre-existing table
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2. the computer screen is made up of a thousand little dots called pixels. theyre in a rectangular grid like a table.a
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- [ascii code example](https://i.imgur.com/9uvKRVo.png)
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- There are several tables that describe what to draw
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- fonts describe how to draw them
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- ASCII (american standard code for information) describes what should be drawn for Roman (english like) alphabets
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- e.g.,
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- A 1000001 (65)
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- B 1100001 (97)
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- 9 0111001 (57)
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- There are only a few letter numbers and punctuation marks. The remaining ASCII code are non-printing and have other meaning (line feed, for feed, tab etcc)
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- ASCII characters are stored using 7-bits
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- so there are 128 (2^7) possible characters
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- stored as a byte with the 8th bit set to zero
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- For sorting purposes characters are compared on their numeric value (called the *collating sequence*)
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- 'A' is before 'Z' but 'a' is after 'Z'!
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47
content/notes/characters.md
Normal file
47
content/notes/characters.md
Normal file
@ -0,0 +1,47 @@
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---
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title: "characters"
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aliases:
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tags:
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- cosc204
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---
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# Characters
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- A written symbol.
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- In english are represented as a single byte, (other languages use 2 bytes or more)
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- e.g., [different types of characters](https://i.imgur.com/DBLVhw8.png)
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- characters are joined together to make human readable numbers and words
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- `char ch`
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- ch is a variable name (identifier)
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- used to label a location in the computer's memory where a byte is stored
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- when the code is compile, the name is assigned an address, in memory. The meaning of that data depends on how a human interprets it. it might be small integer, or a character, or a color etc.d
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- each byte (or group of bytes) represents a number which maps to a character using a mapping like [Unicode](notes/characters.md#Unicode) or [ASCII](notes/characters.md#ASCII)
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# ASCII
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A char is a 7-bit number (usually stored as a byte with the 8th bit set to zero) used as an index into a table of characters. The font describes how to draw these characters
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- ASCII (american standard code for information) describes what should be drawn for Roman (english like) alphabets
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- ASCII characters are stored using 7-bits
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- so there are 128 (2^7) possible characters
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- stored as a byte with the 8th bit set to zero
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- For sorting purposes characters are compared on their numeric value (called the *collating sequence*)
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- 'A' is before 'Z' but 'a' is after 'Z'!
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# Unicode
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A 21-bit code with 144,697 characters from 159 scripts
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- Other non roman languages
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- greek, arabic, chinese, hebrew, japanese, thai etc.
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- atrology symbols
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- emoji etc
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- Unicode
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- developed by the Unicode Consortium
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- coordinated with ISO/IEC 10646
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- unicode maps from character numbers (code points) into glyphs (graphical representations)
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- Some(many) are reserved
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@ -7,7 +7,7 @@ tags:
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> [!Definition]
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> Combinatorial Logic Circuit is a circuit whose digital outputs are dependent only on its digital inputs
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They can be described using logic expressions and therefore logic gates. We assume the outputs respond immediately^[1]
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They can be described using logic expressions and therefore logic gates. We assume the outputs respond immediately
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- current flows from + to -
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- input to a unit (e.g., LED) is at the + end
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@ -18,19 +18,18 @@ They can be defined:
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- Using graphical symbols
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# Adders
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# Parity Generator
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- 3 Bit parity Generator
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- Adds an extra bit to the input data so that the number of ones in the output is always odd
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- Used for error checking
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- [truth table](https://i.imgur.com/KDUiJbN.png)
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- [boolean equation](https://i.imgur.com/mwBpnlO.png)
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- [circuit](https://i.imgur.com/tsgDISC.png)
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Adds an extra bit to the input data so that the number of ones in the output is always odd. Used for error checking
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# Demux
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# 7 Segment
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- 
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@ -11,8 +11,7 @@ tags:
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[page](https://cosc204.cspages.otago.ac.nz)
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# Notes
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- [ASCII](notes/ASCII.md)
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- [unicode](notes/unicode.md)
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- [characters](notes/characters.md)
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- [digital-data](notes/digital-data.md)
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- [memory](notes/memory.md)
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- [boolean-equations](notes/boolean-equations.md)
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@ -39,15 +39,3 @@ Data is stored in [memory](notes/memory.md)
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- [amount of bits for different devices](https://i.imgur.com/nHrz1zX.png)
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# Characters
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- A written symbol.
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- In english are represented as a single byte, (other languages use 2 bytes or more)
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- e.g., [different types of characters](https://i.imgur.com/DBLVhw8.png)
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- characters are joined together to make human readable numbers and words
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- `char ch`
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- ch is a variable name (identifier)
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- used to label a location in the computer's memory where a byte is stored
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- when the code is compile, the name is assigned an address, in memory. The meaning of that data depends on how a human interprets it. it might be small integer, or a character, or a color etc.d
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- each byte (or group of bytes) represents a number which maps to a character using a mapping like [unicode](notes/unicode.md) or [ASCII](notes/ASCII.md)
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@ -1,20 +0,0 @@
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---
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title: "unicode"
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aliases:
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tags:
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- cosc204
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---
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## Unicode
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- Other non roman languages
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- greek, arabic, chinese, hebrew, japanese, thai etc.
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- atrology symbols
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- emoji etc
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- Unicode
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- developed by the Unicode Consortium
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- coordinated with ISO/IEC 10646
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- a 21-bit code with 144,697 characters from 159 scripts
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- unicode maps from character numbers (code points) into glyphs (graphical representations)
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- Some(many) are reserved
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