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IBM PC XT/370
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== Operating Environment: VM/PC == The XT/370 boots '''PC DOS 2.10''' first, then loads '''VM/PC''' (Virtual Machine/Personal Computer). VM/PC presents a single-user CMS environment that closely mirrors mainframe VM/CMS: * '''CMS "virtual disks"''' (minidisks) are stored as PC DOS files. User FRED's minidisk 101 becomes the PC DOS file '''FRED.101'''. * '''EXPORT''' and '''IMPORT''' commands transfer files between CMS and PC DOS, with automatic EBCDICโASCII conversion. * CMS commands, EXEC scripts, and most CMS applications run unchanged. * No multi-user support โ VM/PC is single-user only. VM/PC version 2 (November 1985) added '''page-cache support''' to reduce hard-disk paging overhead. The IBM AT/370 ships an updated VM/PC for PC DOS 3.0, with the wider 16-bit 370PC-P2 and 370PC-M2 cards (still 512 KB on the M2 card, with 32 KB reserved for microcode).
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