17 Mar
2004
17 Mar
'04
11:15 a.m.
I have a heath ET-34 microprocessor lab, 6809 based I think. I'd like to
find the expansion unit for it, I think it's called ET-34A - the one that
gives it BASIC and such.
18 Mar
18 Mar
7:31 a.m.
"Jay West" <jwest(a)classiccmp.org> said:
I have a heath ET-34 microprocessor lab, 6809 based I
think. I'd like to
find the expansion unit for it, I think it's called ET-34A - the one that
gives it BASIC and such.
I think you meant:
ET-3400 (6800) Original microprocessor trainer
ET-3400A (6808) Revised version
ETA-3400 Expansion unit
The 3400's are common on eBay and go for very little. The expansion
units are pure unobtanium and go for hundreds of dollars on the rare
occasions when one shows up. For me, the price is not justified. I plan on
hacking in some additional memory for mine someday. After all, there's a
breadboard socket right there on the unit! Should be possible to add the
BASIC as well, if someone will post the data.
BTW, there's a simulator at:
http://www.pilgrimworks.com/trainer.htm
but I haven't tried it.
Paul Pennington
Augusta, Georgia
11:41 a.m.
From: Paul Pennington <paulpenn(a)knology.net>
The 3400's are common on eBay and go for very
little. The expansion
units are pure unobtanium and go for hundreds of dollars on the rare
occasions when one shows up. For me, the price is not justified. I plan
on
Not pure unobtanium... Seems like about 5 give or take a few have been sold
on ebay last year including one still as a kit. Don't remember the prices
but I think at least one went cheap and another for at least alot. I can
account for the two I have here. One hooked up now to my 3400 nearby that
runs great and so much fun especially when playing with ttl too, and another
eta that's still in kit forn with everything 'cept the box it came in, and
docs (Heath's Illustration Booklet, Schematics, Assembly Manual, Software
Reference Manual, and the Modification Kit (back to the et-3400)) too.
hacking in some additional memory for mine someday.
After all, there's a
breadboard socket right there on the unit! Should be possible to add the
BASIC as well, if someone will post the data.
If someone's desperate and it's no where else on the net already. yell
again. Must procrastinate.
BTW, there's a simulator at:
http://www.pilgrimworks.com/trainer.htm
Nice but I'd rather use my real et-6800, with the cardboard case (serial
#8) ;) !!
Paul Pennington
Augusta, Georgia
Hey, you're not too distant. Brunswick, Ga here.
;)
- Mike: dogas(a)bellsouth.net
19 Mar
19 Mar
1:39 p.m.
"Mike" <dogas(a)bellsouth.net> said:
Not pure unobtanium... Seems like about 5 give or
take a few have been
sold on ebay last year including one still as a kit. Don't remember the
prices
but I think at least one went cheap and another for at
least alot.
Okay, there are some around, but more than I would pay. I guess the
crazy prices are bringing them out of hiding. Here's some recent price
points for Heathkit ETA-3400's on eBay:
Mar 14, 2004 $380. With ET-3400, manual, and EE-3401 course.
Feb 20, 2004 $565 With ET-3400, both unbuilt.
Feb 16, 2004 $437 With ET-3400A, both unbuilt.
One question: is there an assembly listing for the tiny BASIC in the
manual?
Paul Pennington
Augusta, Georgia
1:57 p.m.
Geeze... I almost had a deal made on one Paul... until you posted those
prices!
/me trotts off to set the list to "all posts require moderator approval"
J/K :>
----- Original Message -----
From: "Paul Pennington" <paulpenn(a)knology.net>
To: "General Discussion: On-Topic Posts Only" <cctech(a)classiccmp.org>
Sent: Friday, March 19, 2004 9:39 PM
Subject: Re: Wanted: ET phone home :)
"Mike" <dogas(a)bellsouth.net> said:
Not pure unobtanium... Seems like about 5 give
or take a few have been
sold on ebay last year including one still as a kit. Don't remember the
prices
but I think at least one went cheap and another
for at least alot.
Okay, there are some around, but more than I would pay. I guess the
crazy prices are bringing them out of hiding. Here's some recent price
points for Heathkit ETA-3400's on eBay:
Mar 14, 2004 $380. With ET-3400, manual, and EE-3401 course.
Feb 20, 2004 $565 With ET-3400, both unbuilt.
Feb 16, 2004 $437 With ET-3400A, both unbuilt.
One question: is there an assembly listing for the tiny BASIC in the
manual?
Paul Pennington
Augusta, Georgia
21 Mar
21 Mar
12:44 p.m.
"Jay West" <jwest(a)classiccmp.org> said:
Geeze... I almost had a deal made on one Paul... until
you posted those
prices!
Sorry about that! I wouldn't pay over $50 for one, so I guess that
means I won't get one. As I said, I'm looking forward to hacking in a
serial port and more memory. Don't really see the point of BASIC when
there's no keyboard. I think I'll just use it as intended, as a trainer and
prototyping system.
Paul Pennington
Augusta, Georgia
11:35 p.m.
Well, actually, for the ET-3400 my interest isn't so much "collecting" as
it
is just plain technical interest. I would be happy with a replica of the
ETA-3400 to hook up to my ET3400. Is it a complex box to duplicate?
Jay
---
[This E-mail scanned for viruses by Declude Virus]
22 Mar
22 Mar
2:52 a.m.
New subject: Heathkit ETA-3400
"Jay West" <jwest(a)classiccmp.org> said:
Well, actually, for the ET-3400 my interest isn't
so much "collecting" as
it
is just plain technical interest. I would be happy
with a replica of the
ETA-3400 to hook up to my ET3400. Is it a complex box to duplicate?
What do you want to do with it? I don't have one, but I understand an
ETA-3400 adds a serial port, more memory, Tiny BASIC, and a cassette
interface.
The serial port is easily implemented with a 6850 and a one-chip RS-232
driver. Adding on more memory should also be one chip (64K x 8 static RAM?)
and maybe an EPROM to replace the 1K monitor ROM. Those are the only things
I am really interested in doing. Hopefully I can make it load and store
programs down the serial port to a PC.
As for the cassette port, not interested in going down that road again!
Has the manual for the ETA-3400 been scanned and put on a web site
anywhere?
Paul Pennington
Augusta, Georgia
10:55 a.m.
New subject: Heathkit ETA-3400
From: Paul Pennington <paulpenn(a)knology.net>
"Jay West" <jwest(a)classiccmp.org>
said:
> Well, actually, for the ET-3400 my interest isn't so much "collecting"
as
it
> is just plain technical interest. I would be happy with a replica of the
> ETA-3400 to hook up to my ET3400. Is it a complex box to duplicate?
It's pretty much a 6820 PIA, two 2k ROMS (one for Tiny Basic, one for Fantom
II (terminal driven monitor,)) 2x to 8x 2114 RAMS, and a programmed 32x8
ttl ROM (74S188) to handle the address decoding for *all* those chips. The
rest of it is the 5,+12. -12 power supply and the glue between the PIA and
the RS232/TTY & cassette i/o.
There's also a modification back to the et-3400 needed changing the system
clock rate and a few line drivers.
The manauls have the rom code for the Fantom II monitor and even the 74188
but not the Heath/Pittman Tiny Basic.
What do you want to do with it? I don't have
one, but I understand an
ETA-3400 adds a serial port, more memory, Tiny BASIC, and a cassette
interface.
The serial port is easily implemented with a 6850 and a one-chip
RS-232
driver. Adding on more memory should also be one chip
(64K x 8 static
RAM?)
and maybe an EPROM to replace the 1K monitor ROM.
Those are the only
things
I am really interested in doing. Hopefully I can make
it load and store
programs down the serial port to a PC.
As for the cassette port, not interested in going down that road
again!
I'll have to find that Kilobaud article where the dude wires up a floppy
interface to the et-3400...
Has the manual for the ETA-3400 been scanned and
put on a web site
anywhere?
;)
- Mike: dogas(a)bellsouth.net
7581
days inactive
7586
days old
8 comments
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