Motorola MC68000 - Revision history

Jnc: Move image into infobox

2024-02-08T15:37:14Z

Move image into infobox

Jnc: /* External links */ +data sheet

2023-07-12T15:22:19Z

‎External links: +data sheet

Larsbrinkhoff: Typo.

2023-02-11T14:38:15Z

Typo.

Jnc: +Cat

2018-11-03T11:53:23Z

+Cat

Jnc: Fix addr bus width error

2018-01-24T13:07:27Z

Fix addr bus width error

Tor: Typo fixed.

2016-12-05T12:42:39Z

Typo fixed.

Neozeed: Add an image of the 68000 processor

2016-11-23T05:01:21Z

Add an image of the 68000 processor

Jnc: move length discussion to family article

2016-11-14T18:39:18Z

move length discussion to family article

Jnc: a decent start

2016-11-14T17:38:29Z

a decent start

New page

{{Infobox CPU
| name = MC68000
| manufacturer = [[Motorola]]
| family = [[Motorola M68000 Family]]
| architecture = 32-bit
| address bus = 24-bit
| data bus = 16-bit
| year introduced = 1979
| registers = 15 general 32-bit registers (8 data, 7 address)
| clock speed = 4 MHz - 16.67 MHz
}}

The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture''''', because in a number of important aspects of an architecture:

* Word (address space) size
* Register length
* Many operations (arithmetical, logical, etc)

It is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.

A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was occurred when a fault occurred. Several computer makers worked around this by including two separate MC68000 chips; when a page fault occurred, the first one was 'frozen', and a second fixed up the fault, then restarted the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].

← Older revision		Revision as of 15:22, 12 July 2023
Line 18:		Line 18:

	{{semi-stub}}		{{semi-stub}}
		+
		+	==External links==
		+
		+	* [http://www.bitsavers.org/components/motorola/68000/ 68000] - documentation at [[Bitsavers]]
		+	** [http://www.bitsavers.org/components/motorola/68000/MC68000_16-Bit_Microprocessor_Apr83.pdf MC68000 16-Bit Microprocessor] - data sheet

	[[Category: Motorola Microprocessors]]		[[Category: Motorola Microprocessors]]

@@ Line 13: / Line 13: @@
 [[Image:mc68000.jpg|thumb|200px|right|MC68000 from a Macintosh SE]]
-The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit [[architecture]]; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.
+The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorola as a "16-bit microprocessor", it is generally considered to be a 32-bit [[architecture]]; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.
 A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a [[page fault]] occurred. Several computer makers worked around this by including two separate MC68000 chips; when a fault occurred, the first CPU was 'frozen', and a second fixed up the fault, then re-started the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].

← Older revision		Revision as of 11:53, 3 November 2018
Line 16:		Line 16:

	A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a [[page fault]] occurred. Several computer makers worked around this by including two separate MC68000 chips; when a fault occurred, the first CPU was 'frozen', and a second fixed up the fault, then re-started the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].		A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a [[page fault]] occurred. Several computer makers worked around this by including two separate MC68000 chips; when a fault occurred, the first CPU was 'frozen', and a second fixed up the fault, then re-started the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].
		+
		+	{{semi-stub}}
		+
		+	[[Category: Motorola Microprocessors]]

@@ Line 4: / Line 4: @@
 | family = [[Motorola M68000 Family]]
 | architecture = 32-bit
-| address bus = 24-bit
+| address bus = 23-bit (16-bit word address)
 | data bus = 16-bit
 | year introduced = 1979
@@ Line 13: / Line 13: @@
 [[Image:mc68000.jpg|thumb|200px|right|MC68000 from a Macintosh SE]]
-The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture'''''; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.
+The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit [[architecture]]; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.
-A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a fault occurred. Several computer makers worked around this by including two separate MC68000 chips; when a page fault occurred, the first one was 'frozen', and a second fixed up the fault, then restarted the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].
+A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a [[page fault]] occurred. Several computer makers worked around this by including two separate MC68000 chips; when a fault occurred, the first CPU was 'frozen', and a second fixed up the fault, then re-started the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].

← Older revision		Revision as of 12:42, 5 December 2016
Line 15:		Line 15:
	The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture'''''; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.		The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture'''''; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.

−	A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was ~~occurred~~ when a fault occurred. Several computer makers worked around this by including two separate MC68000 chips; when a page fault occurred, the first one was 'frozen', and a second fixed up the fault, then restarted the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].	+	A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was saved when a fault occurred. Several computer makers worked around this by including two separate MC68000 chips; when a page fault occurred, the first one was 'frozen', and a second fixed up the fault, then restarted the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].

@@ Line 1: / Line 1: @@
 {{Infobox CPU
 | name = MC68000
 | manufacturer = [[Motorola]]
 | family = [[Motorola M68000 Family]]
@@ Line 10: / Line 13: @@
 | clock speed = 4 MHz - 16.67 MHz
 }}
 The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorola as a "16-bit microprocessor", it is generally considered to be a 32-bit [[architecture]]; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.

@@ Line 11: / Line 11: @@
 }}
-The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture''''', because in a number of important aspects of an architecture:
+The '''Motorola MC68000''' was the first member of the [[Motorola M68000 Family]] of [[VLSI]] [[microprocessor]]s. Although it was described by Motorala as a "16-bit microprocessor", it is generally considered to be a 32-bit '''''architecture'''''; it is probably more correct to describe it as a 16-bit '''''implementation''''' of a 32-bit architecture.
 A major failing of the MC68000 was that it could not support [[virtual memory]]; not enough internal state was occurred when a fault occurred. Several computer makers worked around this by including two separate MC68000 chips; when a page fault occurred, the first one was 'frozen', and a second fixed up the fault, then restarted the 'main' CPU. This issue was fixed with the successor chip, the [[MC68010]].