Instruction - Revision history

Jnc: 'instruction set' is better equivalent for 'order code' than 'object code' (see EDSAC document)

2025-11-06T08:52:30Z

'instruction set' is better equivalent for 'order code' than 'object code' (see EDSAC document)

2025-11-05T19:06:46Z

'order'/'order code' in the UK

2025-11-04T06:19:26Z

Add order code. Maybe also ILLIAC and UNIVAC.

2023-06-03T17:50:34Z

‎See also: +Instruction set

2023-06-03T11:04:06Z

Especially early ones

2023-06-03T08:59:22Z

Also "order".

2018-12-15T14:11:29Z

better cat

2018-12-13T02:57:32Z

+cat

2018-10-19T12:21:11Z

Correct cat

2017-10-02T14:54:58Z

UNify tense

@@ Line 3: / Line 3: @@
 In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. add the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a [[word]], but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
-Some early computers used the alternative term '''order''' for instructions, and '''order code''' for [[Object code|machine code]].  This was more common in the UK; especially at Cambridge (on the [[EDSAC]], and descendants such as the [[LEO]]). In the US, uses included several [[Lincoln Laboratory]] computers, and the [[PDP-1]].
+Some early computers used the alternative term '''order''' for instruction (and '''order code''' for [[instruction set]]).  This was more common in the UK; especially at Cambridge (on the [[EDSAC]], and descendants such as the [[LEO]]). In the US, uses included several [[Lincoln Laboratory]] computers, and the [[PDP-1]].
 {{semi-stub}}
 ==External links==
@@ Line 15: / Line 11: @@
 * [https://www.cl.cam.ac.uk/relics/orders.notes.html The EDSAC Order Code]
-[[Category: CPU Basics]]
+[[Category: Computer Basics]]

@@ Line 3: / Line 3: @@
 In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. add the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a [[word]], but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
-Some early computers used the alternative term '''order''' for instructions, and '''order code''' for [[Object code|machine code]].  Notable examples include the [[Lincoln Laboratory]] computers, and the [[PDP-1]].
+Some early computers used the alternative term '''order''' for instructions, and '''order code''' for [[Object code|machine code]].  This was more common in the UK; especially at Cambridge (on the [[EDSAC]], and descendants such as the [[LEO]]). In the US, uses included several [[Lincoln Laboratory]] computers, and the [[PDP-1]].
 {{semi-stub}}
@@ Line 10: / Line 10: @@
 * [[Instruction set]]
 [[Category: CPU Basics]]

@@ Line 3: / Line 3: @@
 In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. add the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a [[word]], but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
-Some early computers used the alternative term '''order''' for instructions.
+Some early computers used the alternative term '''order''' for instructions, and '''order code''' for [[Object code|machine code]].  Notable examples include the [[Lincoln Laboratory]] computers, and the [[PDP-1]].
 {{semi-stub}}

@@ Line 1: / Line 1: @@
 An '''instruction''' is, at the highest level of abstraction, the smallest unit of computation which a [[programmer]] can direct the [[Central Processing Unit|CPU]] to perform.
-In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. a the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a [[word]], but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
+In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. add the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a [[word]], but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
-Some computers use the alternative word '''order''' for instructions.
+Some early computers used the alternative term '''order''' for instructions.
 {{semi-stub}}
 [[Category: CPU Basics]]

← Older revision		Revision as of 12:21, 19 October 2018
Line 3:		Line 3:
	In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. a the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a word, but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)		In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. a the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a word, but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)

−	{{stub}}	+	{{semi-stub}}

@@ Line 1: / Line 1: @@
 An '''instruction''' is, at the highest level of abstraction, the smallest unit of computation which a programmer can direct the [[Central Processing Unit|CPU]] to perform.
-In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contained a single directive for the CPU (e.g. a the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a word, but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
+In more practical terms, the CPU operates by fetching items from [[main memory]]; each item contains a single directive for the CPU (e.g. a the contents of one [[register]] to another, or move a unit of data from a register, to main memory) - those items are instructions. (An instruction is usually a word, but on some CPUs, multiple instructions could be packed in each word, while on others, some instructions took multiple words.)
 {{stub}}