Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!mips!pacbell.com!att!rutgers!cmcl2!sbcs!eeserv1.ic.sunysb.edu!jallen
From: jallen@eeserv1.ic.sunysb.edu (Joseph Allen)
Newsgroups: comp.arch
Subject: Re: Wanted DEC-10/20 stuff, and emulator
Message-ID: <1991Apr18.221109.29852@sbcs.sunysb.edu>
Date: 18 Apr 91 22:11:09 GMT
References: <9104171333.AA12267@cwns1.INS.CWRU.Edu>
Sender: usenet@sbcs.sunysb.edu (Usenet poster)
Organization: State University of New York at Stony Brook
Lines: 23

In article <9104171333.AA12267@cwns1.INS.CWRU.Edu> an288@cleveland.Freenet.Edu writes:

>I've been working on a 10 emulator off and on since they took mine away 
>from me (sniff) back in 83.  I was never able to achieve enough performance
>to justify until recently, with the new MIPS chip and the 80486.  Its
>serious enough to consider now.  I am up to KI-10 but I am having trouble
>with the tops-20 pager and the extended instructions.  I know of two other
>people that are working on this also.  Hopefully something will turn up for
>you eventually.....hang on to those backups ! hahaha

Cool project!  Maybe you can skip the extended address instructions (is that
what you mean?), I don't think TOPS-20 used them (although I could be wrong
about this).  The byte instructions must be fun.

Once I heard a rumor that someone was going to put a DEC20 on a chip... anyone
here about this?  I have no other details.
--
#define h 23 /* Height */         /* jallen@ic.sunysb.edu (129.49.12.74) */
#define w 79 /* Width */                       /* Amazing */
int i,r,b[]={-w,w,1,-1},d,a[w*h];m(p){a[p]=2;while(d=(p>2*w?!a[p-w-w]?1:0:0)|(
p<w*(h-2)?!a[p+w+w]?2:0:0)|(p%w!=w-2?!a[p+2]?4:0:0)|(p%w!=1?!a[p-2]?8:0:0)){do
i=3&(r=(r*57+1))/d;while(!(d&(1<<i)));a[p+b[i]]=2;m(p+2*b[i]);}}main(){r=time(
0L);m(w+1);for(i=0;i%w?0:printf("\n"),i!=w*h;i++)printf("#\0 "+a[i]);}