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From: pl@etana.tut.fi (Lehtinen Pertti)
Newsgroups: comp.sys.amiga.tech
Subject: Re: 32-bit Ram & Instruction Lengths.
Message-ID: <11722@etana.tut.fi>
Date: 14 Mar 90 10:20:16 GMT
References: <10136@cbmvax.commodore.com>
Sender: News@tut.fi
Lines: 32

From article <10136@cbmvax.commodore.com>, by bbaker@cbmvax.commodore.com (Bob Baker - Product Assurance):
> In article <223.25fd1cf8@waikato.ac.nz> hamish@waikato.ac.nz writes:
>> 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,

	Actually it means that instructions are 1 to five WORDS in length
	as odd number of bytes is not allowed.

	One word is two bytes but it can't be generalized.

>> irrespective of the processor being used, (68008-68030, 020&030 might have
>> longer ones, but I doubt it.)
> 
> Actually, if you include the floating point instructions then the
> maximum instruction length can go up to 8 WORDS (16 bytes) when using
> immediate operands!
>

	In 68020 (030/040) move with two memory indexed operands is
	upto 11 words in length. (opcode + extension + 32 bit disp +
	32 bit disp + extension + 32 bit disp + 32 bit disp).

--
pl@tut.fi				! All opinions expressed above are
Pertti Lehtinen				! purely offending and in subject
Tampere University of Technology	! to change without any further
Software Systems Laboratory		! notice