796	 SABRAG A Time-Sharing Low-Cost Computer	 The serial SABRAC computer designed and built in the Scientific Department of the Israel defense Ministry has a -location magnetic drum main store. To avoid a need to resort to optimum programming techniques and to increase its overall efficiency the computer has also been given a -word ferrite core store from which the program is obeyed. Transfers between the core and drum stores and to and from the twin paper-tape input and output channels are all available autonomously concurrently time-shared . Multiplication and division orders are also autonomous so that the machine may be executing up to three orders simultaneously. All functions naturally are interlocked. A number of other advanced orders and facilities are also incorporated.In particular an Execute order permits a temporary jump for up to four orders and a second modifier register permits double modification in general and relative addressing of subroutines in particular. Thus the overall effective speed of the machine is muchhigher than its basic specification would lead one to expect and its design indicates one way in which the concepts of time sharing may be incorporated in low-cost computers.
