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From: wls@astrovax.UUCP (William L. Sebok)
Newsgroups: net.jokes.d
Subject: Re: Assembler Manual Needed - (nf)
Message-ID: <220@astrovax.UUCP>
Date: Fri, 17-Feb-84 21:04:30 EST
Article-I.D.: astrovax.220
Posted: Fri Feb 17 21:04:30 1984
Date-Received: Sat, 18-Feb-84 05:24:37 EST
References: <5669@uiucdcs.UUCP> <206@pucc-i>
Organization: Princeton Univ. Astrophysics
Lines: 16

> BSP - Backspace program counter?  That's a genuine possiblility on at least 
> one machine.
> 
> The TI980 has (I would say "had", but I know of at least one that is still
> operating) 8 16-bit registers that are accessible by a whole range of
> register-to-register instructions such as RMO (register move), RIN
> (register increment), RAD (register add), ROR (register or), etc.
> 
> Register number 7 is the program counter.
> 
On the PDP 11 the immediate addressing mode is  (pc)+
I have always wondered what would happen when one used an operand of the form:		-(pc)
On a Vax I am pretty sure that it would trap.
-- 
Bill Sebok			Princeton University, Astrophysics
{allegra,akgua,burl,cbosgd,decvax,ihnp4,kpno,princeton,vax135}!astrovax!wls