Housed in a card frame with pinboard for easy connection of stops, pistons and displays.

Card Frame and Pinboard

Today, computers are widely used throughout the business and commercial world. Small  microprocessor based computers are also used extensively in hospitals and many people are alive today as a result of such technology and its reliability. Organ Builders are no exception and many use computers to assist with everyday production and office management. Such is the change in attitudes experienced over a period of two decades. In the 1970 's when we developed the TMS 9000 microprocessor based organ switching and combination system, Organ builders could not comprehend how a small piece of black plastic could become the brain of an organ's note switching and combination system. The TMS 9000 owes its success to its modular design and flexibility. The use of standard plug in circuit boards using readily available components has stood the test of time and should allay fears of that dreaded word "obsolescence". Not many electronic designs can claim such a long product life and yet still be a market leader. At the heart of each system is a microprocessor printed circuit board which contains the relevant software. Stops, pistons etc. are connected to INPUT printed circuit boards. Drawstop solenoids, LED displays and illuminated thumb pistons, etc. are connected to OUTPUT printed circuit boards. Each INPUT or OUTPUT board can interface directly to 64 inputs or outputs.

Standard Input Board with Test Switches	Standard Output Board with Test LEDs

The printed circuit boards are housed in a metal enclosure and connect to each other at the rear by a 16 slot Mother Board. For reliability of connections, two-part DIN 41612 connectors are used and important connections along the Mother Board use two pins of each connector, providing enhanced reliability. On the front edge of most printed circuit boards is mounted a connector. The connector is factory wired to a test board set out in organ building terms and provides the most convenient form of connection. The provision of a single high quality removable two part DIN 41612 connector on the front of each printed circuit board also provides a simple yet reliable way of allowing the temporary removal of wiring looms for site installation. Simple testing and checking procedures are possible by unplugging the cable connectors connected to the input and output boards and substituting SWITCH and LED test boards. The SWITCH test board is used to replace key contacts or any other form of contact and can be used to confirm a fault within the input wiring. Similarly, the LED test board can be used as a substitute for action magnets or any other output and can confirm a fault within the output wiring.   The system is supplied complete with a small filtered power supply to power the logic. Additionally a separate power supply is needed to power the drawstop solenoids and displays etc.