INPUT AND OUTPUT CONTROL SYSTEM FOR VIRTUAL COMPUTER

摘要

PURPOSE:To perform the input/output processing of a virtual computer at a high speed by applying a virtual input/output system not only to a virtual disk produced temporarily but to a magnetic disk device containing a permanent file. CONSTITUTION:A control table 54 is produced in response to the address of a virtual device described to a VDISKF. Then a has table 57 needed for conversion into a virtual address to a CCHHR is secured together with a synonym table 58. The addresses of these tables are set within the table 54. At the same time, a virtual memory space is produced and its segment address is also set on the table 54. A buffer equivalent to the track length is secured in order to read out the record on a real disk for each track. Then zero is set as the initial value of the virtual address. This virtual address is replaced by adding the length of both key and data parts of each record together as the record is read into a virtual disk space.