SystemsGC20-1734-2A Guide to theIBM System/370Model 145This guide presents hardware, programming systems,and other pertinent information about the IBM Sys-tem/370 Model 145 that describes its significant newfeatures and advantages. The contents are intendedto acquaint the reader with the Model 145 and to beof benefit in planning for its installation.Associated with this guide are four optional supple-ments that describe operating systems for theModel 145 that support a virtual storage environment.Each supplement has its own form number and mustbe ordered individually, if required. Optional supple-ments are the following:• DOS/Virtual Storage Features Supplement *• as/Virtual Storage 1 Features Supplement(GC20-1752)• as/Virtual Storage 2 Features Supplement(GC20-1753)• Virtual Machine Facility /370 Features Supplement **Availability to be announced