Difference between revisions of "Motorola 68000"
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=== The Motorola 68k processor === | === The Motorola 68k processor === | ||
| − | The Motorola 68k processor | + | The Motorola 68k processor is a 16-bit Big-Endian format processor, using 32-bit register and addresses. |
| − | Note: | + | This means that instruction sizes on average are either 2 or 4 bytes each, and 6 bytes for longword / 32-bit instructions. |
| + | |||
| + | Note: The assigment direction is source,dest instead of dest,source !!! | ||
==== Registers ==== | ==== Registers ==== | ||
Revision as of 03:36, 20 June 2022
Contents
Introduction
Wanting to start sizecoding on a Motorola 68k platform in this day and age can be tough.
So here is a bit of help to get you started:
The Motorola 68k processor
The Motorola 68k processor is a 16-bit Big-Endian format processor, using 32-bit register and addresses.
This means that instruction sizes on average are either 2 or 4 bytes each, and 6 bytes for longword / 32-bit instructions.
Note: The assigment direction is source,dest instead of dest,source !!!
Registers
- D0..D7 - 8 x 32 bit General Purpose Registers
- A0..A6 - 7 x 32 bit Address Registers
- A7 - 32-bit Stack-Address Register
Instructions timing
The number of cycles for each instruction is different depending of processor model in M68K family.
Motorola M68K Platforms
- Atari ST - Atari ST Sizecoding information
- Atari Jaguar - Atari Jaguar Sizecoding information
- Commodore Amiga - Commodore Amiga Sizecoding information
