When the available space does not permit installation of the Main Unit I, the perfect solution is the Main Unit I "M". Because the mini-unit has the same performance characteristics, all applications which run on the C-Control/BASIC Unit can also be transferred to the Main Unit I "M". Solely the LEDs, buttons, interface IC & pull-up resistances are not provided, for reasons of space. However, besides offering a further frequency measurement input, the Main Unit I "M" also has an in-circuit programmable interface with CMOS/TTL compatible levels. For connection to the PC serial interface, for level matching you will also need an external level converter or the C-Control/BASIC M adapter which is offered as an option (order no. 95 06 02). Special feature: After a power failure, your application program will be automatically re-booted by the integral reset device.