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.
>
> >
>

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