5 Jun
2016
5 Jun
'16
5:06 p.m.
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?
5 Jun
5 Jun
5:39 p.m.
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?
8:12 p.m.
Bill,
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?
9:42 p.m.
On Sun, Jun 5, 2016 at 11:12 PM, drlegendre . <drlegendre at gmail.com> wrote:
Bill,
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.
Oops I did not notice the ETA- vs EWA-
It could be that T = Tiny BASIC and W = Wintek Monitor (only). i.e. you
need to find a BASIC ROM if you want to make it an "ETA". There should be
no reason not to be able to load BASIC into memory via the serial port if
you don't have a BASIC ROM. I believe you'd put it into 0010-00C7. You'd
need 0000-0009 (?) and 0100-0FFF to be read/write.
The monitor starts at 1C00, uses upper memory.
This my guess.
10:21 p.m.
And as good a guess as any, so far..
It seems my box has both the monitor and tiny basic ROMs on-board.. or at
least, it seems that the requisite chips are present. Until I can come up
with a 2x20 pin header, to connect my ET-3400A, I won't really know.
I did put out a request to the list for a header, but no one has offered
up. Looks like I need to go ahead and order up (more than I need) from eBay
or someplace. I don't even have a junk mobo to plunder - and even so, I'd
be lucky to get one removed in decent shape. They really aren't made for
that kind of re-use.
On Sun, Jun 5, 2016 at 11:42 PM, william degnan <billdegnan at gmail.com>
wrote:
On Sun, Jun 5, 2016 at 11:12 PM, drlegendre .
<drlegendre at gmail.com>
wrote:
Bill,
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.
Oops I did not notice the ETA- vs EWA-
It could be that T = Tiny BASIC and W = Wintek Monitor (only). i.e. you
need to find a BASIC ROM if you want to make it an "ETA". There should be
no reason not to be able to load BASIC into memory via the serial port if
you don't have a BASIC ROM. I believe you'd put it into 0010-00C7. You'd
need 0000-0009 (?) and 0100-0FFF to be read/write.
The monitor starts at 1C00, uses upper memory.
This my guess.
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