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

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.

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KIM-1 PCB Edge connectors

The KIM-1 needs 2 edge connectors.

The specifications are: card edge; PIN: 44; 3.96mm

When you search for those, the cheap ones pop up, Chinese made, look good. But they are no good, when you slide them one you need a lot of force, some even use a hammer!
The PCB is too thick for these connectors, you damage the edge fingers and can not change once connected.
DO NOT USE THEM for a KIM-1!

I had some luck, years ago I bough a lot, cable type (solder eyelets) from Conrad and they are perfect for the KIM-1.

307-044-500-202 Standard Card Edge Connectors 44P SOLDER EYELETS 5.08mm ROW SPACE, for sliding on a PCB edge connector.
307-044-520-202 Standard Card Edge Connectors 44P Card Edge PC Tail, for a motherboard

EDAC 307 357 Series Card Edge Connectors English Ordering Guide

307-044-520-202 – EDAC Card Edge Connector

307-044-500-202 – EDAC Card Edge Connector

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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, the cheap ones pop up, Chinese made, look good. But they are no good, when you slide them one you need a lot of force, some even use a hammer!
The PCB is too thick for these connectors, you damage the edge fingers and can not change once connected.
DO NOT USE THEM for a KIM-1!

I had some luck, years ago I bough a lot, cable type (solder eyelets) from Conrad and they are perfect for the KIM-1.

307-044-500-202 Standard Card Edge Connectors 44P SOLDER EYELETS 5.08mm ROW SPACE, for sliding on a PCB edge connector.
307-044-520-202 Standard Card Edge Connectors 44P Card Edge PC Tail, for a motherboard

EDAC 307 357 Series Card Edge Connectors English Ordering Guide

307-044-520-202 – EDAC Card Edge Connector

307-044-500-202 – EDAC Card Edge Connector

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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 opportunity to scan/rescan/repair what I have online until now.
All documents in the MTU pages are now clean and higher quality, about 50 new PDFs.

Noteworthy are the new revised K-1008 September 1979 document and the now complete and revised K-1013 manuals and 2 versions of the CODOS V1 manual.
All the K-1002 documents, for KIM-1, SYM-1, AIM 65 and Commodore PET are new.

Micro Technology Unlimited – Retro ComputingMTU history: Hal Chamberlin
MTU Catalogs, Product Descriptions and Newsletters
MTU Application notes
MTU K-1000 power unit
MTU K-1002 Audio D/A Converter
MTU K-1005 Card File and Motherboard using KIM/MTU bus
MTU K-1007 PET MTU bus interface
MTU K-1008 Visable Memory
MTU K-1008 documents
Dave Plummer has a K-1008
The K-1008 and the KIM-1 Simulator
Graphics Software Package K-1008
K-1008 Test programs
K-1008-2L Patches to Microsoft BASIC
K-1008 Visable Memory Replica by Eduardo Casino
MTU K-1009-1C AIM 65 Printer Enhancement Package
K-1012 PROM expansion board
K-1013 floppy controller
MTU CODOS
MTU K-1016 16K RAM board
MTU K-1020 Prototyping board
MTU K-1032 Banker RAM ROM I/O

MTU Application notes

MTU Application Note 1
Battery power for your KIM-1
MTU Application Note 2
use of the K-1008 Visible Memory For Grey Scale Display
MTU Application Note 3 K-1008 50 Hz Operation
MTU Application Note 4
Using 2716’s with the K-1012 PROM I/O board
MTU Application Note 5
Addressing the K-1008 on 4K boundaries
MTU Application Note 6
Addressing considerations in expanded AIM 65 systems
MTU Application Note
Optimizing usage of the AiM 65 I/O block
MTU Application Note 7
Using Qume Datatrack-8 with the K-1013

K-1012 PROM expansion board

MTU K-1012 May 1979 PROM I/O
MTU K-1012 PROM I/O Jan 1980

K-1012 Circuit 1


K-1012 Circuit 2

K-1012 Circuit 3

K-1012 PROM Expansion Board

K-1012 PROM Expansion Board

MTU K-1016 16K RAM board

An MTU/KIM bus compatible 16K RAM board. with dynamic RAMs type MM5280, as used also in theK-1008 Viable Memory.

MTU K-1016 16k memory January 1979
MTU K-1016 16k memory Manual Revised September 1979

K-1016 Circuit part 1

K-1016 Circuit part 2

K-1016 Circuit part 3

K-1016 Circuit part 4

K-1016 Memory Expansion Board

K-1016 Memory Expansion Board

MTU K-1020 Prototyping board

An MTU/KIM bus compatible prototyping board. With on baord +5V and +12V power supplies.

MTU K-1020 user manual August 1979
MTU K-1020 user manual August 1979 alternative version

K-1020 Prototype board

MTU K-1032 Banker RAM ROM I/O

A RAM ROM I/O board with flexible addressing.

  • 32K RAM in 2x 16K pages
  • 8/16K (EP)ROM
  • EPROM Programmer (2716/2732)
  • 4x 8 bit I/O ports (2×6522)
  • Bank switching for RAM and ROM
MTU K-1032 Banker RAM ROM manual
Rev B
MTU K-1032 Banker RAM ROM manual
Rev E



K-1032 Expansion Board

K-1032 Expansion Board



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MTU K-1007 PET MTU bus interface

The K-1007-1-PET is an interface between the PET 2001 and the MTU/KIM-1 bus. This allows MTU products to be used on the PET 2001.

K-1007-1-PET interface
K-1007-1-A PET interface manual
K-1007-1-B Circuit diagram
K-1007-1-C Supplement
K-1007-3-A New PET Circuit diagram