In the center of the diagram, at the upper side, the display of the eight Light Emitting Diodes is drawn. The addressing of them by the address-lines AD08 and AD09 from the microprocessor with the signal-line WDS (Write Strobe Output) is displayed below the diodes. The data-input switches (8) with buffers to prevent rumbling connections, are drawn at the left side of the scheme.
The RAM memories, along with the ROM memories with the only once written "Operating system", is centrally situated in the drawing. The addressing of the memories and of the data-input with the additional signal-lines NDRS and NWDS is drawn in the center part at the under-side of the scheme. The user-electronic circuitry of the service-panel is drawn along and below the image of the microprocessor (INIT/ABORT, PROG HALT, SINGLE INSTR and the RUN-switches).
Electronic Diagram of the Microcomputer
(full size 59KB)
