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From: ron@brl-smoke.UUCP
Newsgroups: net.arch
Subject: Re: Re: Addressing modes
Message-ID: <1749@brl-smoke.ARPA>
Date: Wed, 12-Mar-86 18:48:30 EST
Article-I.D.: brl-smok.1749
Posted: Wed Mar 12 18:48:30 1986
Date-Received: Sat, 15-Mar-86 21:54:13 EST
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Organization: Ballistic Research Lab (BRL)
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> >> The TRUE RISC would have only one instruction: subtract....
> >
> >Not quite. You need two address, you see. If we go to two instructions, we

> "subtract one" and "branch on negative".  They proceeded to

Somewhere (UTEXAS?) someone designed a MOVE PROCESSOR, which only
had move from memory to memory instructions.  To do math you fed
an ALU memory address the operands and pulled back.  The PC was
another address.  Sort of like having to program at the microcode
level all the time.

-Ron