Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site astrovax.UUCP Path: utzoo!watmath!clyde!burl!hou3c!hocda!houxm!ihnp4!astrovax!wls 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