32-bit Ram & Instruction Lengths.

Article View: comp.sys.amiga.tech

Article #14191

Back to comp.sys.amiga.tech Previous Next

#14191

From: hamish
Date: Tue, 13 Mar 1990 03:16

26 lines
1262 bytes

I quote from the official motorola MC68010/MC68012  16-/32 bit Virtual
Memory Microprocessors Advance Information manulal, May 1985.

"Instructions are from one to five words in length...."
   pg 2.4

This means that an instruction is anywhere from 2-10 bytes in length,
irrespective of the processor being used, (68008-68030, 020&030 might have
longer ones, but I doubt it.)

Instructions must start on a word boundary, ie every 16 bits. A 32 bit word is
a LONG WORD.
  pg 1.3

The length of instruction & the instruction itself are specified in the first
word of the instruction & the others are the instruction operands.

Hope it helps to all involved in possibly misleading statements which have
flown past my screen involved in this subject of memory size. 

Remember
    1024k bytes = 512k words = 256k long words.

Which also equals 2048 nibbles.

Hamish Marson.

Technical Details

Message-ID: <223.25fd1cf8@waikato.ac.nz>

Path:

arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!ames!uhccux!munnari.oz.au!kaukau.comp.vuw.ac.nz!virtue!hamish

Show Full Headers

Complete Article Headers

Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!swrinde!zaphod.mps.ohio-state.edu!usc!elroy.jpl.nasa.gov!ames!uhccux!munnari.oz.au!kaukau.comp.vuw.ac.nz!virtue!hamish
From: hamish@waikato.ac.nz
Newsgroups: comp.sys.amiga.tech
Subject: 32-bit Ram & Instruction Lengths.
Message-ID: <223.25fd1cf8@waikato.ac.nz>
Date: 13 Mar 90 03:16:56 GMT
Lines: 26