Heathkit ET-3400

From the manual: "The ET-3400 Microcomputer Learning System is a practical, low cost microprocessor trainer; designed as a learning tool to teach microprocessor operation, programming, and applications."

The breadboard areas allowed students to configure the machine for a variety of different experiments and tasks.

With the expansion chassis the memory was extended significantly and the input/output capabilities were expanded to allow the use of a terminal and cassette tape drive.

(Submitted July 14, 2008 14:46:48 by Jan Wyckoff)

I am having trouble getting the Serial port on the expansion I/O unit to work.

I can get the )Mon prompt, bet every time a typs a character in I get a Line Feed and Carraige return.

I looked in both manulas and can't find any information other than Baud Rate settings on how the Serial I/O should be configured.

Does anyone have specific information about the correct configuration for the serial port(word length, stop bits, parity, handshaking, etc.)

Thanks

Jan

(Submitted April 15, 2008 13:39:28 by Pascal1999)

i HAVE ONE ET-3400 FOR SALE OUT OF BOX , POWERS UP, NO MANUALS MISSING ONE BUTTON COVER (BUTTON WORKS) AND NO OTHER COMPONENTS WILL SELL FOR BELOW THE $50.00 LISTED PLUS COST OF SHIPPING PLEASE EMAIL ASAP 51X@EMAIL.COM

(Submitted April 12, 2008 11:58:32 by Craig Richardson)

I just acquired 3 ET-3400s to use in a training course for several home schooled kids. Aside from teaching them digital electronics we'll also be adding peripherals such as 8x8 led display, E2PROM, and a sound generator chip. Great fun!

(Submitted January 8, 2008 15:43:13 by (a href=mailto:)Leon(/a))

I just emailed a person in Arizona who has one for trade. Check the phoenix craigslist. She also has several copy paper boxes of manuals, but isn't sure what they are.

(Submitted December 31, 2007 08:17:21 by Ted Lisiura)

Where could I get these training manuals?

(Submitted November 23, 2007 17:28:32 by tony)

I've ones. If you want to buy please email to me (sawat123@hotmail.com).

(Submitted September 13, 2007 01:08:52 by ayaz)

I SENDING THIS E-MAIL BECAUSE I NEED THAT MANUAL, A COPY OR A PDF ARCHIVE, PLEASE SEND SOME INFORMATION THAT HELP TO GET WHAT I WANT. I,LL APRECIATE YOUR ANSWER

(Submitted August 30, 2007 23:10:43 by Jakato Russom)

Do you know where can buy a copy bot the boot prom of the et 3400a microprocessor trainer?

(Submitted July 16, 2007 17:55:43 by Brian Bergantz)

How could I get a copy of the three ET 3400 manuals that you have?

(Submitted July 4, 2007 01:03:31 by Tim Zank)

Docs for the ET-3400 can be found here: http://www.classiccmp.org/dunfield/heath/index.ht m

(Submitted June 30, 2007 06:26:45 by john)

Have the HW, need the Docs, where do I go from here?

(Submitted May 12, 2007 15:14:12 by whipaway)

Hello to All I need the schematic for the ET-3400A, which is different from the original ET-3400, which I already have. I have an ET-3400 that does not have the MCM6830A ROM. I have a ET-3400A that uses the 8316 ROM and one that uses a 2716 EPROM, which are interchangable. I want to create an interface circuit that will allow me to use a 2716 EPROM in the ET-3400. A schematic for the ET3400A will really be appreciated. Thanks in advance, whipaway@yahoo.com

(Submitted April 25, 2007 12:02:25 by Ern)

Does any one have the text book that goes along with this trainer in word format?

(Submitted April 25, 2007 12:02:21 by Ern)

Does any one have the text book that goes along with this trainer in word format?

(Submitted April 25, 2007 12:02:06 by Ern)

Does any one have the text book that goes along with this trainer in word format?

(Submitted April 9, 2007 21:07:25 by Jamie)

(( Does anyone know what is causing the problem and how to fix it? ))

This was the pre-cursor to the BSD problem with descendant monitors (built from similar hobbyist components). Did you try Ctrl-Alt-Del already?

(Submitted February 7, 2007 08:38:15 by Luposian)

I have an ET-3400A that displays all 8's when I power it up. Pulling/reseating all IC's did nothing to fix it. Does anyone know what is causing the problem and how to fix it? This thing is useless right now.

(Submitted December 18, 2006 10:30:04 by Erik Klein)

Re: are you selling heathkit ET-3400 trainers and courses??

No, I'm not selling but someone else might be. . .

(Submitted December 18, 2006 09:39:25 by terry bigourdin)

hi there,are you selling heathkit ET-3400 trainers and courses??thanks terry

(Submitted April 16, 2006 07:52:35 by peter)

Looking for the binaries of the et/eta-3400 ROMs. The partial source listings in the manuals are incomplete. Any help will be appreciated

(Submitted March 28, 2006 00:00:10 by R Granback)

I still have my ET3400 along with the supplied circuts and experiment/lesson manuals. Toward the end I programmed it for the display to function as a clock and my favorite game was a lunar lander game where the object was to land (altitude 0) by varying thrust between 0 10. Still fully functional.

(Submitted March 11, 2006 03:41:47 by him)

http://www.parse.com/~ddunfield/museum/heath/index.htm

i found the manual there :) have fun

(Submitted November 20, 2005 14:13:14 by Aliosman Demirbas)

please e-mail me the price and address where i can pay through credit card for heathkit model ET-3400 including the manuals.

(Submitted October 15, 2005 21:06:39 by Jack Rubin)

PDF versions of the manuals for Heathkit 8 bit computers - H8, H89 and ET3400 - are online in the SEBHC archives. Visit www.sebhc.org for more information on how to access this material.

(Submitted October 5, 2005 10:34:01 by ROMAN LEON)

I SENDING THIS E-MAIL BECAUSE I NEED THAT MANUAL, A COPY OR A PDF ARCHIVE, PLEASE SEND SOME INFORMATION THAT HELP TO GET WHAT I WANT. I,LL APRECIATE YOUR ANSWER.

(Submitted October 4, 2005 13:55:57 by Kurt Risser)

This was my very first computer. The base configuration had 256 bytes and no expansion chassis such as the one pictured. One had to program it directly in 6800 machine code- hexadecimal mind you, no assembler or numonics, and calculate your own forward and reverse jumps by hand.

(Submitted September 27, 2005 13:12:49 by gustav)

quisiera obtener el manual del ET 3400 gracias

(Submitted August 23, 2005 18:24:16 by dwight goss)

please e-mail me the price and address where i can send money order or pay through credit card for the manuals for heathkit model ET-3400

(Submitted April 6, 2005 05:15:53 by miguel morales gines)

necesito el manual del lenguaje hexadecimal para poder realizar programas.

Description
Manufacturer	Heath, Inc.
Model	ET-3400 Microprocessor Trainer
Date Announced	1976
Date Canceled	Unknown
Number Produced	Many tens of thousands
Country of Origin	USA
Price	Approx. $200.00
Current Value	$50-$100

Specifications
Processor	Motorola 6800
Speed	1 MHz
RAM	256 Bytes base expandable to several K via different add-ons.
ROM	1K ROM(s) for Tiny BASIC, Monitor, etc.
Storage	Cassette tape optional with expansion
Expansion	Heathkit ET-3400 Memory I/O Expansion Accessory
Bus	N/A
Video	None
I/O	Serial
OS Options	None

Notes	With the Memory I/O Accessory the trainer could be used as a full computer programmable in BASIC or Assembly including the ability to hook up a terminal for I/O and a tape recorder for program storage.

Related Items in Collection	Heathkit ET-3100, Heathkit ET-3200
Related Items Wanted	None