Seawell Little Motherboard

In Bad König, Westenwald, Germany, Matthias Schmitt and his wife have developed a museum dedicated to Technik called TECMUMAS. Mostly retro computers from the early days to the nineteens.

Here some photos of my visit in June 2025, when I was given the opportunity to see and photograph MOS Technology KIM-4 and KIM-5 devices and the Synertek MDT 1000.

Besides those systems TECMUMAS is home to about 1400 computers and what comes with it: manuals, books, monitors and more.

The museum has a large room to display a part of the collection, regularly refreshed with objects of the collection absed upon a theme.

See the page with photos of TECMUMAS. And the following updates to pages:

Synertek MDT 1000
KIM Brochure
KIM-1 Rev F image
KIM-4
KIM-5

KIM-1 connectors: beware the Chinese cheap variants!

The KIM-1 needs 2 edge connectors. The specifications are: card edge; PIN: 44; 3.96mm When you search for those, ...

Magazines: Compute! and Compute II

The pages om Magazines had an update. MICRO has its own page with all Best of MICRO pfds. Compute! and Compute II ar...

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet. I took the oppo...

Focal-65 V3D for TIM and KIM-1

Focal on the 6502, a page on this small language, originating for Digital Equipment. A small interpreter (about 5K) for...

TECMUMAS, dem Technikmuseum Matthias Schmitt

In Bad König, Westenwald, Germany, Matthias Schmitt and his wife have developed a museum dedicated to Technik called TECMUMAS. Mostly retro computers from the early days to the nineteens.

Here some photos of my visit in June 2025, when I was given the opportunity to see and photograph MOS Technology KIM-4 and KIM-5 devices and the Synertek MDT 1000.

Besides those systems TECMUMAS is home to about 1400 computers and what comes with it: manuals, books, monitors and more.

The museum has a large room to display a part of the collection, regularly refreshed with objects of the collection absed upon a theme.

Photo made in TECMUMAS museum

Some 6502 based systems on display: AIM 65 with 19 inch rack, Syko AIM 65 system, Thaler CT-65, KIM-1 rev F, Synertek MDT 1000, MICRO MAG magazine

KIM-1 revisions, what changed?

I know of seven KIM-1 revisions, labeled Rev A-G and the first one unlabeled. Rev C is unknown! What changed between ...

KIM-1 Circuit poster

With every KIM-1 came a large poster with the Circuit Diagram. The circuit stayed the same from 1975 to 1977, but there ...

A 2K Symbolic Assembler for the KIM-1

A 2K Symbolic Assembler, by Robert Ford Denison. An assembler and editor in 2K! This small program allows to assemble...

The Rockwell KIM-1

Once in a while I hear a myth on the internet about Rockwell manufactured the KIM-1. That myth needs to be debunked. ...

Synertek MDT 1000

During a visit to the TECMUMAS museum I found a Synertek MDT 1000 development system. Only known to me from an advertisement in Electronics 1980. Matthias allowed me to make detailed photos!

Some pages from Synertek databooks refer to parts of the MDT 1000 system

Coming soon scan of the MDT 1000 manual, TECMUMAS Matthias will do that soon!

KIM-1 revisions, what changed?

I know of seven KIM-1 revisions, labeled Rev A-G and the first one unlabeled. Rev C is unknown! What changed between ...

KIM-1 Circuit poster

With every KIM-1 came a large poster with the Circuit Diagram. The circuit stayed the same from 1975 to 1977, but there ...

A 2K Symbolic Assembler for the KIM-1

A 2K Symbolic Assembler, by Robert Ford Denison. An assembler and editor in 2K! This small program allows to assemble...

The Rockwell KIM-1

Once in a while I hear a myth on the internet about Rockwell manufactured the KIM-1. That myth needs to be debunked. ...

Synertek pages update: SYM-1, SYM-2, KTM

Posted on 09/06/2025 by hanso

New information added to the Synertek pages:

Images of Synertek objects in my collection
SYM-1s, KTM/2-80, expansions, books, manuals, ICs

SYM-1 Manuals
VIM-1 Reference Manual May 1978 scanned
Circuit Diagram SYM-1 high resolution high quality scanned
SYM-1 Technical Notes

Manual of KTM-2 and KTM-2/80February 1981 , high quality

SYM-2 manual, photos, source of monitor and ROM dump

KIM-1 connectors: beware the Chinese cheap variants!

The KIM-1 needs 2 edge connectors. The specifications are: card edge; PIN: 44; 3.96mm When you search for those, ...

Magazines: Compute! and Compute II

The pages om Magazines had an update. MICRO has its own page with all Best of MICRO pfds. Compute! and Compute II ar...

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet. I took the oppo...

Focal-65 V3D for TIM and KIM-1

Focal on the 6502, a page on this small language, originating for Digital Equipment. A small interpreter (about 5K) for...

My Synertek collection photos

Here images of Synertek related objects in my collection.

VIM-1 the first version of the SYM-1

First SYM-1 back and front

First SYM-1 back

Second SYM-1

Third SYM-1

First KTM-2/80 front

First KTM-2/80 back

Second KTM-2/80 front. Note the EPROMs

Second KTM-2/80 back, with a 7400 to select the larger EPROM

KTM-2/80. Mote the ’80’ jumper solder bridge.

Corsham RAM/ROM board for AIM 65/SYM-1

Retrospy RAM/ROM board, I/O board, SYMDOS board

SYM-1 Cassettess Tiny Basic 2KAseembler, Power connector

SYM-1 Expansion baord

KIM-1 revisions, what changed?

I know of seven KIM-1 revisions, labeled Rev A-G and the first one unlabeled. Rev C is unknown! What changed between ...

KIM-1 Circuit poster

With every KIM-1 came a large poster with the Circuit Diagram. The circuit stayed the same from 1975 to 1977, but there ...

A 2K Symbolic Assembler for the KIM-1

A 2K Symbolic Assembler, by Robert Ford Denison. An assembler and editor in 2K! This small program allows to assemble...

The Rockwell KIM-1

Once in a while I hear a myth on the internet about Rockwell manufactured the KIM-1. That myth needs to be debunked. ...

SYM-1 and SYM-2 updates

Posted on 25/05/2025 by hanso

Paul Schroeter gave me the dump of the SYM-2 ROM and photos of the backside.He also scanned his photocopy of the SYM-2 Reference Manual.

More about the SYM-1 and SYM-2 on the Synertek pages

Sources of SYM-1 and SYM-2 Monitor ROMs

Many years ago Paul R.Santa-Maria (who sadly left us in 2012) gave me the listing of the source of the Monitor ROM in the SYM-1 1.1
Delivered as a listing, with the comments from the listing in the SYM-1 Reference manual and formatted close to the printed listing.

This is the heading of the listing:

SYM-1 SUPERMON AND AUDIO CASSETTE INTERFACE SOURCES
COMBINED AND CONVERTED TO TELEMARK ASSEMBLER (TASM) V3.1

0002 0000 ;
0003 0000 ;*****
0004 0000 ;***** COPYRIGHT 1979 SYNERTEK SYSTEMS CORPORATION
0005 0000 ;***** VERSION 2 4/13/79 “SY1.1”

Since the ROM of the SYM-1 1.0, 1.1 and the ROM of the SYM-2 2.0 are available:

Converted the listing back to source format (TASM32, standard MOS format).
Created separate source for the SYM-1 1.0 ROM, the SYM-1 1.1 ROM (the original listing) and the SYM-2 ROM.
Typed in the audio cassette interface sources from the 1.0 reference manual.
Changed the SYM-2 source to the different hardware (a 6532 at AC00 instead of a VIA) and other (minor) changes.
Binary output compared to the original ROM dumps as proof the sources match the dumps.

In this archive sources of 1.0, 1.1, 2.0 listings, binary output.

KIM-1 connectors: beware the Chinese cheap variants!

The KIM-1 needs 2 edge connectors. The specifications are: card edge; PIN: 44; 3.96mm When you search for those, ...

Magazines: Compute! and Compute II

The pages om Magazines had an update. MICRO has its own page with all Best of MICRO pfds. Compute! and Compute II ar...

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet. I took the oppo...

Focal-65 V3D for TIM and KIM-1

Focal on the 6502, a page on this small language, originating for Digital Equipment. A small interpreter (about 5K) for...

Another KIM-5 located!

Posted on 08/05/2025 by hanso

I have found a second KIM-5, also in Germany of the KIM-5.

Photos of a KIM-5 board with the Resident Assembler/Editor 6540 ROMs in a KIM-4 motherboard. Photos from the TECMUMAS, dem Technikmuseum (Matthias Schmitt)

More about the KIM-5 here.

KIM-1 connectors: beware the Chinese cheap variants!

The KIM-1 needs 2 edge connectors. The specifications are: card edge; PIN: 44; 3.96mm When you search for those, ...

Magazines: Compute! and Compute II

The pages om Magazines had an update. MICRO has its own page with all Best of MICRO pfds. Compute! and Compute II ar...

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet. I took the oppo...

Focal-65 V3D for TIM and KIM-1

Focal on the 6502, a page on this small language, originating for Digital Equipment. A small interpreter (about 5K) for...

Siemens Personal Computer PC 100 Bedienungsanleitung, Ausgabe 1981/1982

Posted on 08/05/2025 by hanso

A contribution by Michael Steil of the scan of ‘Siemens Personal Computer PC 100 Bedienungsanleitung, Ausgabe 1981/1982’

The Siemens PC 100 was a version of the 6502-based “AIM-65” SBC in a case and with slightly modified ROMs. Siemens offered a set of German-language manuals, which included translated Assembler (MOS Resident Assembler) and BASIC (Microsoft BASIC) manuals, but also a general manual (“Bedienungsanleitung”).

See the PC100 page for more information like manuals and ROM dumps.

Siemens Personal Computer PC 100 Bedienungsanleitung,
Ausgabe 1981/1982

KIM-1 connectors: beware the Chinese cheap variants!

The KIM-1 needs 2 edge connectors. The specifications are: card edge; PIN: 44; 3.96mm When you search for those, ...

Magazines: Compute! and Compute II

The pages om Magazines had an update. MICRO has its own page with all Best of MICRO pfds. Compute! and Compute II ar...

All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

I got hold a about 10 cm of MTU documents. Several I already had in PDF format, some not available yet. I took the oppo...

Focal-65 V3D for TIM and KIM-1

Focal on the 6502, a page on this small language, originating for Digital Equipment. A small interpreter (about 5K) for...

Digitus KIM-1 clone

Scandinavian? KIM

Found this photo in a Facebook group, from an Ebay auction. , no more information known. Looks like a standard KIM-1 with 2x 2114 SRAM ICs for the standard 1K RAM.

Recently on Ebay an identical KIM-1 lookalike showed up. The PCB is inspired but clearly newly designed.
Armin Hierstetter bought it and send me the following photos.