公开(公告)号：DE2239163A1

公开(公告)日：1973-02-22

申请号：DE2239163

申请日：1972-08-09

Applicant: IBM

Inventor： EDSTROM GENE HAROLD ,  ELWELL RUSSELL MERRITT ,  IRWIN JOHN WILLIAM

IPC: G06F11/00 ,  G06F11/14 ,  G06F13/00 ,  G06F13/38 ,  G06F15/16 ,  G06F3/04

Abstract: Data processing peripheral subsystems are connectable to two different types of data processing systems, each having different capabilities. For example, one data processing system Type 1 has certain error recovery procedures which are greater and more effective than those available for Type 2. The peripheral subsystem detects the type of data processing system to which it is attached and adjusts its operational procedures for emulating the operation of a Type 2 data processing system to the operational capabilities of the Type 1 data processing system without internal changes within the data processing system. The peripheral subsystem is further adapted to operate in a degraded mode with a data processing system of either type when the situation demands it.