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| Newer page: | version 11 | Last edited on Thursday, July 7, 2005 9:54:26 am | by AristotlePagaltzis | |
| Older page: | version 10 | Last edited on Thursday, July 7, 2005 4:38:32 am | by AristotlePagaltzis | Revert |
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A family of [CPU]s made by [Motorola], sometimes also referred to as "68k".
The design has 16 32-bit registers, split into 8 data and 8 address registers. The instruction set is quite orthogonal and instructions are always multiples of 16 bits in length. Accesses to anything larger than a byte have to be 16-bit aligned. Overall, the architecture has a strong [RISC] feel to it, though it is not. It has always been fully 32-bit, as opposed to the [x86] design, which started out as a 16-bit design that was painfully evolved to 32-bit.
-The 68000, the first in the series, was introduced in September 1979, and only had a 24-bit address bus. The 68010, introduced in 1982, allowed the use of VirtualMemory, but offered too little additional further advantages
to justify its price in
the eyes of most customers
. The 68020, debuting
in 1984, was fully 32-bit, and software could immediately take advantage of this because the architecture had always been designed for the fact. The 68k family enjoyed wide deployment, and is nowadays still used in embedded devices. Some architectures built around this [CPU] family include:
+The 68000, the first in the series, was introduced in September 1979, and only had a 24-bit address bus. The 68010, introduced in 1982, allowed the use of VirtualMemory, but most customers decided the [MMU] alone
offered insufficient advantage
to justify the expense over
its predecessor, so they waited for
the 68020 instead
. The 68020, which debuted
in 1984, was fully 32-bit, and software could immediately take advantage of this because the architecture had always been designed for the fact. The 68k family enjoyed wide deployment, and is nowadays still used in embedded devices. Some architectures built around this [CPU] family include:
* The AppleLisa and the AppleMacintosh.
* The Commodore [Amiga].
* The [Atari] ST.
@@ -15,9 +15,9 @@
* The Apollo/Domain workstations.
* VMEbus single-board computers from BVM, Motorola and Tadpole.
* Until recently, the PalmPilot [PDA]s.
* In any number of lasers printers, such as [HP], Printronix, [Adobe], [IBM], Lexmark and others more.
-* In countless architectures, as peripheral controllers and processors.
+* In countless architectures, as peripheral controllers and signal
processors.
-The original 68000 design was in production by Motorola up until 2000, and is still in production under license by others, along with its successors and many licensed derivative designs
of all the designs of the family. Innumerable devices employ these [CPU]s even today.
+The original 68000 design was in production by Motorola up until 2000, and is still in production under license by others, along with its successors and many licensed derivatives
of all the designs of the family. Innumerable devices employ these [CPU]s even today.
You can run [Linux] on a range of [680x0]-based systems thanks to the effort of the [Linux/m68k project | http://www.linux-m68k.org/]. Ports exist to a variety of systems; f.ex., on later AppleMacintosh~es that use the 68030 and upwards (such as the SE30), its [Linux/mac68k subproject | http://www.mac.linux-m68k.org/] allows running [Debian]. See the [Linux/m68k project | http://www.linux-m68k.org/] for more architectures.
