article · German
Das Hybride Rechnersystem HRS 900
A 1968 technical journal article by Ralf Schwarz, published in Techn. Mitt. AEG-TELEFUNKEN (3rd supplement, Datenverarbeitung), describing the AEG-TELEFUNKEN HRS 900 hybrid computer system. The system combines the RA 770 precision analog computer (with sub-computers RA 775 and RA 776), the hybrid coupling unit HKW 900, and the CII/SDS-licensed 90-40 digital computer (24-bit, 6 MHz, up to 32K words). The article explains the rationale for hybrid computing — filling the speed gap of digital computers in solving differential equations — and details the architecture of each subsystem including the digital programming field, timing circuits, servo potentiometers, and data-transfer mechanisms.
hybrid computer systemsanalog-digital couplingprecision analog computerreal-time simulation