Heathkit ETA-3400 vs. ETW-3400 confusion?

drlegendre . drlegendre at gmail.com
Sun Jun 5 22:12:26 CDT 2016


Thanks, nice little site you made there. I also lack the correct ribbon
cable, so it seems my mod will use a plain gray ribbon.. and so long as
it's installed correctly, that should be just fine. ;-)

Thing is, it still doesn't answer my main question.. Your expansion accy.
is screened 'ETA-3400' and mine is screened 'EWA-3400'.

They seem to share the same board & components, so why the two different
marks - is there any material difference? I see that yours has some
switches on the front panel, but I assume that those are for your custom
serial comms. mod.

On Sun, Jun 5, 2016 at 7:39 PM, william degnan <billdegnan at gmail.com> wrote:

> http://www.vintagecomputer.net/browse_thread.cfm?id=553
> Here are my notes.
> Bill Degnan
> twitter: billdeg
> vintagecomputer.net
> On Jun 5, 2016 8:06 PM, "drlegendre ." <drlegendre at gmail.com> wrote:
> > Which is the correct model number for the I/O & memory accessory for the
> > Heath ET-3400(A) trainers?
> >
> > I see ETA-3400 and ETW-3400 used interchangeably. For instance, the d/l
> > manuals refer to the unit as ETA-3400 but many (most?) units, mine
> > included, are screened ETW-3400 on the case.
> >
> > Anyone know what gives with this? Are there actually two different models
> > or revisions, as with the ET-3400 and ET-3400A?
> >
> > Also, is there a way to tell if a Heath piece is factory-built? My
> > recently-acquired ETW/A-3400 has a board which almost +must+ have been
> wave
> > soldered and washed. It has no traces of home-assembly. Likewise, the
> rest
> > of the build is top-notch and looks like factory work..
> >
> > Thoughts?
> >
> > PS Still need a 2x20 header (like 40pin IDE) to complete this project.
> > Anybody got a spare?
> >

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