| 摘要 |
PCT No. PCT/JP80/00023 Sec. 371 Date Oct. 21, 1980 Sec. 102(e) Date Oct. 15, 1980 PCT Filed Feb. 20, 1980 PCT Pub. No. WO80/01850 PCT Pub. Date Sep. 4, 1980.A virtual machine system is provided with a control program for concurrently operating a plurality of OSs (Operating Systems). The object is to suppress the overhead produced when simulating privileged instructions for controlling program status words (PSWs). For this purpose, there is provided simple hardware, in place of the software control conventionally used, including a modification register for storing information required to modify the current PSW information and a pending register for storing pending interrupt information for communication to the corresponding OS. |
