vault backup: 2022-11-02 13:17:25

content/notes/01-bits-and-bytes.md

@@ -11,7 +11,7 @@ sr-ease: 230
 
 [memory](notes/memory.md)
 [unicode](notes/unicode.md)
-[ASCII](notes/ASCII.md)
+[characters](notes/characters.md)
 [digital-data](notes/digital-data.md)
 
 

content/notes/ASCII.md

@@ -1,28 +0,0 @@
----
-title: "ASCII"
-aliases: 
-tags: 
-- cosc204
----
-
-# ASCII Character Code
-![ascii code](https://i.imgur.com/NbBtm1v.png)
-
-1. The computer uses ch as a integer index into a pre-existing table 
-2. the computer screen is made up of a thousand little dots called pixels. theyre in a rectangular grid like a table.a
-
-- [ascii code example](https://i.imgur.com/9uvKRVo.png)
-
-- There are several tables that describe what to draw
-	- fonts describe how to draw them
-- ASCII (american standard code for information) describes what should be drawn for Roman (english like) alphabets
-- e.g.,
-	- A 1000001 (65)
-	- B 1100001 (97)
-	- 9 0111001 (57)
-- 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)
-- ASCII characters are stored using 7-bits
-	- so there are 128 (2^7) possible characters
-	- stored as a byte with the 8th bit set to zero
-	- For sorting purposes characters are compared on their numeric value (called the *collating sequence*)
-	- 'A' is before 'Z' but 'a' is after 'Z'!

content/notes/characters.md

@@ -0,0 +1,47 @@
+---
+title: "characters"
+aliases: 
+tags: 
+- cosc204
+---
+
+# Characters
+- A written symbol.
+- In english are represented as a single byte, (other languages use 2 bytes or more)
+- e.g., [different types of characters](https://i.imgur.com/DBLVhw8.png)
+
+- characters are joined together to make human readable numbers and words
+
+- `char ch` 
+- ch is a variable name (identifier) 
+- used to label a location in the computer's memory where a byte is stored
+- 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
+
+- 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)
+
+# ASCII
+![ascii code|300](https://i.imgur.com/NbBtm1v.png)
+
+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
+
+- ASCII (american standard code for information) describes what should be drawn for Roman (english like) alphabets
+- ASCII characters are stored using 7-bits
+	- so there are 128 (2^7) possible characters
+	- stored as a byte with the 8th bit set to zero
+	- For sorting purposes characters are compared on their numeric value (called the *collating sequence*)
+	- 'A' is before 'Z' but 'a' is after 'Z'!
+
+# Unicode
+![unicode|300](https://i.imgur.com/GEtVItW.png)
+
+A 21-bit code with 144,697 characters from 159 scripts
+
+- Other non roman languages
+	- greek, arabic, chinese, hebrew, japanese, thai etc.
+	- atrology symbols
+	- emoji etc
+- Unicode
+	- developed by the Unicode Consortium
+	- coordinated with ISO/IEC 10646
+	- unicode maps from character numbers (code points) into glyphs (graphical representations)
+	- Some(many) are reserved

content/notes/combinatorial-logic.md

@@ -7,7 +7,7 @@ tags:
 
 > [!Definition]
 > Combinatorial Logic Circuit is a circuit whose digital outputs are dependent only on its digital inputs
-They can be described using logic expressions and therefore logic gates. We assume the outputs respond immediately^[1]
+They can be described using logic expressions and therefore logic gates. We assume the outputs respond immediately
 
 - current flows from + to -
 - input to a unit (e.g., LED) is at the + end
@@ -18,19 +18,18 @@ They can be defined:
 - Using graphical symbols
 
 # Adders
-![1 Bit half adder](https://i.imgur.com/mjCVU4I.png)
+![1 Bit half adder|300](https://i.imgur.com/mjCVU4I.png)
-![1 Bit full adder: (includes carry input)](https://i.imgur.com/yu6kS83.png)
+![1 Bit full adder: (includes carry input)|300](https://i.imgur.com/yu6kS83.png)
-![Ripple carry adder](https://i.imgur.com/HtEIZ5t.png)
+![Ripple carry adder|300](https://i.imgur.com/HtEIZ5t.png)
 
 # Parity Generator
-- 3 Bit parity Generator
+Adds an extra bit to the input data so that the number of ones in the output is always odd. Used for error checking
-	- Adds an extra bit to the input data so that the number of ones in the output is always odd
+
-	- Used for error checking
+![truth table|300](https://i.imgur.com/KDUiJbN.png)
-	- [truth table](https://i.imgur.com/KDUiJbN.png)
+![boolean equation|300](https://i.imgur.com/mwBpnlO.png)
-	- [boolean equation](https://i.imgur.com/mwBpnlO.png)
+![circuit|300](https://i.imgur.com/tsgDISC.png)
-	- [circuit](https://i.imgur.com/tsgDISC.png)
 
 # Demux
 
 # 7 Segment
-- ![7 segment displlay](https://i.imgur.com/qtPmtwR.png)
+![7 segment displlay|300](https://i.imgur.com/qtPmtwR.png)

content/notes/cosc-204.md

@@ -11,8 +11,7 @@ tags:
 [page](https://cosc204.cspages.otago.ac.nz)
 
 # Notes
-- [ASCII](notes/ASCII.md)
+- [characters](notes/characters.md)
-- [unicode](notes/unicode.md)
 - [digital-data](notes/digital-data.md)
 - [memory](notes/memory.md)
 - [boolean-equations](notes/boolean-equations.md)

content/notes/digital-data.md

@@ -39,15 +39,3 @@ Data is stored in [memory](notes/memory.md)
 - [amount of bits for different devices](https://i.imgur.com/nHrz1zX.png)
 
 # Characters
-- A written symbol.
-- In english are represented as a single byte, (other languages use 2 bytes or more)
-- e.g., [different types of characters](https://i.imgur.com/DBLVhw8.png)
-
-- characters are joined together to make human readable numbers and words
-
-- `char ch` 
-- ch is a variable name (identifier) 
-- used to label a location in the computer's memory where a byte is stored
-- 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
-
-- 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)

content/notes/unicode.md

@@ -1,20 +0,0 @@
----
-title: "unicode"
-aliases: 
-tags: 
-- cosc204
----
-
-## Unicode
-![unicode](https://i.imgur.com/GEtVItW.png)
-
-- Other non roman languages
-	- greek, arabic, chinese, hebrew, japanese, thai etc.
-	- atrology symbols
-	- emoji etc
-- Unicode
-	- developed by the Unicode Consortium
-	- coordinated with ISO/IEC 10646
-	- a 21-bit code with 144,697 characters from 159 scripts
-	- unicode maps from character numbers (code points) into glyphs (graphical representations)
-	- Some(many) are reserved