On Sat, Apr 23, 2016 at 5:56 PM, Jim Brain <br...@jbrain.com> wrote: > On 4/22/2016 11:02 AM, Guy Sotomayor wrote: > >> I wrote a somewhat long post a while ago on why we’re still stuck with >> various timing artifacts due to the original PC’s choice to use an NTSC >> color burst crystal as the main crystal for the PC. TTFN - Guy >> > Link? > > -- > Jim Brain > br...@jbrain.com > www.jbrain.com > >
I know Jon (Glitch works) has an S-100 card with this IBM square RAM. I saw it at VCF East the other weekend. Anyway, I seem to recall that an S-100 system was used to actually test and port the original IBM DOS 1.0 for 5 1/4" for the new IBM system. I have a copy of a MS or IBM DOS for my CompuPro on 8" disk, I think it's v. 1.25. I also have a copy of 1.25 on my CBM 256x, with 8086 co-processor. Neither of these were BEFORE the original IBM PC, but hint at a time when there was a "DOS" in development floating around before the actual IBM system. This DOS could have been demoed in Europe on an S-100. lots of conjecture here. Just speculating. -- @ BillDeg: Web: vintagecomputer.net Twitter: @billdeg <https://twitter.com/billdeg> Youtube: @billdeg <https://www.youtube.com/user/billdeg> Unauthorized Bio <http://www.vintagecomputer.net/readme.cfm>
