Abstract
A special purpose microprogram processor for I/O-control is described which is used in the medium size multiprocessor system Mod. 125. It employs certain novel characteristics aimed at the special requirements of I/O-control. In particular there exists a mechanism to access I/O very tightly through directly programmable latch registers, a time slicing/trapping facility for synchroneous control of concurrent I/O-operations and special instruction set characteristics. This microprocessor can effectively be subdivided to execute several independent control programs/tasks and this split can be dynamically adjusted to match varying loads of I/O-control jobs. The application of this underlying philosophy is outlined by several examples: Control of punched card machines, line printers and teleprocessing line control.
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