I think that the tubo mode is not happening, it's running like a regular XT. I have seen it go into Turbo mode once or twice, so there is a marginal chip somewhere that needs to be replaced. That's my final decision.
Either way, I have filled the hard drive up with various software from the time period and put it out for people to use in the museum. If you're in the south-eastern PA area, feel free to stop by and check it out. The PC Limited machine from the VCForum I think is the same one as this one. I think the guy gave up on it and donated to the museum. It needed a new power supply, hard drive controller, disk drive to get it running again. I put MS DOS, removed the botched IBM DOS someone had attempted to load. Really, you're right. It's just a cheap clone, but it's a cheap clone that happens to be one of the first PCs made by what would become Dell Computer, worth saving and keeping running! B On Sat, Jun 24, 2023 at 1:36 PM John Herron via cctalk < cctalk@classiccmp.org> wrote: > On Fri, Jun 23, 2023, 6:59 PM Bill Degnan via cctalk < > cctalk@classiccmp.org> > wrote: > > > On Fri, Jun 23, 2023, 6:33 PM Fred Cisin via cctalk < > cctalk@classiccmp.org > > > > > wrote: > > > > > On Fri, 23 Jun 2023, Bill Degnan via cctalk wrote: > > > > It boots fine, did I say it did not boot? I don't remember. There > is > > no > > > > arcnet card, it's not the later model PCs LIMITED box, does not match > > the > > > > red label logo that came out in 1986 > > > > > > Well, I appreciate that people answered my question. I sometimes ask > > questions and then proceed to work on it until I figure it out. There > is a > > THESYS "MULTI/RAM card and that was the card with the password ROM. I > > found the dip switch "PW" and turned it off. Problem solved. The Turbo > > error #04 is still a mystery, but it does not prevent me from using the > > system. I am thinking there's an incorrect but incidental switch > setting. > > It could be a RAM chip but I have no proof. Chkdsk returns an full 640K. > > > > I'm very curious if it gets figured out or if there are any publications > maybe around the time to help identify the parts Dell would have used. I > could be thinking too simply for the college years he built them in his > dorm so I'd imagine common off the shelf parts and generally just an IBM > clone. I would think some other similar era computers would also have that > error code. > > I started reading another person's post with a similar error on vcfed > forums but I don't think they ever really solved it. There was an attempt > to dump the bios to see what it might be checking (beyond my depth of > knowledge). > > I guess that would let you know if it's a bios or other device printing > the error. I assume you've booted it with no addon cards and still see the > message. > > > >