My KIMSI

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My KIMSI

I acquired a KIMSI in August 2026. It was build into a plexiglas/aluminium case, with a KIM-1 (Rev G) and a ‘microcalculator board’. I took the system apart, no room to store the big ugly thing.

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

A boxed Synertek VIM-1

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A boxed VIM-1 acquired in August 2026. More SYM-1 photos here.


See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

SYM-2 prototype

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In August 2026 I acquired an boxed engineering SYM-2 prototype. It comes with two large circuit diagrams illustrating the design.


Next photos by Paul Schroeter.




See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

Jolt with 4K images

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With thanks to Jonathan Chapman of Glitchworks who found a Jolt system, here images of a Jolt with 4K memory, an experimenters board and the power supply.

Here the images

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

KB-9, MOS TECH BASIC for the 6502

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With a scan of manuals by Gerben Voort, and a third photo of a cassette with KB-9, time to refresh the KB-9 pages.

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

The KIM-1, TIM and Jolt explained

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During the hot summer days, locked up in house because of the heat, I made a deep dive into the KIM-1 and the TIM/Jolt software and hardware.

50 years of working with a KIM-1:
The KIM-1 Explained

The Jolt, one of the first 6502 SBC’s, so nicely reproduced now:
The TIM/Jolt explained.

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

Additions to the EMMA system documentation

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Additions to the EMMA system documentation, thanks Keith Norman

Emma Hardware Manual
Eprom Programmer
Mac User Manual

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

Bug in the TTY KIM-1 monitor?

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The KIM-1 monitor surprises me every time I dive into it.
The KIM-1 Explained is nearing completion. The KIM-1 explained

There is a bug in the TTY CLI, it accepts characters as ‘;’ and ‘:’ as valid hex and translates to A..F. 

KIM
0200 A9 ;;
00BB 00 ::
00AA 00 ????
FFFF 1C

More about this innocent feature here: PRTBYT, GETBYT and PACK

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

RAMpager: a 1MB banked RAM expansion for the KIM-1

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An exapnsion for the MTU bus: RAMpager: a 1MB banked RAM expansion for the KIM-1

On this location you can find the open hardware source of a RAM card made for the MTU bus

he RAMpager is a MTU banked RAM expansion for the KIM-1: the board supports up to 1MB (that’s three orders of magnitude above more than the original 1152 bytes!) of memory and maps it to a 4KB window placed between 2000h and FFFFh. The window can be mapped to different banks for read and write operations via two control ports.

It supports an optional internal/external backup battery to keep the data in the SRAMs valid across power cycles.

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...

Kempac documents added

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The Kempac system now is fully documented!

See also:

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1

A demo of the new facilities in the KIM-1 Simulator 2.2.1 Scroll, copy paste of the console. New versions of KIM-...
KIM-1 connectors: beware the Chinese cheap variants!

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

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.

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...