Intel SDK-85 monitor ROM

Chris Elmquist chrise at
Sat Aug 13 12:10:50 CDT 2016

On Saturday (08/13/2016 at 09:59AM -0700), Glen Slick wrote:
> I sent him a private email with a binary dump of the 8355 from my SDK-85.
> It shouldn't be hard to find an Intel 8755 EPROM version of the 8355
> ROM version. Then you just need to find someone to program it if you
> can't program it yourself. I can program 8755 parts, but postage to
> Australia might not be cheap.

And I did same.  So, he's potentially got two versions ;-)

I did fix mine with an 8755.   The failure mode of the 8355 was
intermittent.  I was able to keep it running by pressing on it and
hitting it with freeze spray.  I kept it alive long enough to run a
little dump routine which sent the ROM contents out the serial port
where I captured it.

I then turned this into Intel hex and used that to program a new 8755
which replaced the 8355.


> On Sat, Aug 13, 2016 at 4:15 AM, Chris Elmquist <chrise at> wrote:
> > I believe I can help with this.  Although I do not have a spare device, I do have the binary as Intel hex as I had the same device fail on my SDK-85 and went through the exercise replacing it.  I'll report back off list once I dig up the file.
> >
> > Chris
> >
> >
> > On August 13, 2016 3:07:06 AM CDT, Alexis Kotlowy <thrashbarg at> wrote:
> >>Hi List,
> >>
> >>I've started looking at my SDK-85 after having it on the shelf for
> >>years. I know the 8355 mask ROM on it isn't working but I haven't been
> >>able to find a suitable replacement. I wired up a temporary solution
> >>with a 2716 EPROM only to find the ROM image and source code aren't
> >>available outside of dead-tree format. I'm not about ready to type out
> >>48 pages of source code. Does anyone have a digital copy of the source,
> >>or the assembled binary or, even better, a replacement ROM?
> >>
> >>(I'm in Adelaide, Australia.)
> >>
> >>Cheers,
> >>
> >>Alexis.
> >
> > --
> > Chris Elmquist

Chris Elmquist

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