I had the pleasure to work a few years with CCP/M-86 which allowed multitasking very similar to what Linux in text mode (with virtual consoles) allow today.
![wordstar for cp m wordstar for cp m](http://canal.chez.com/CPM/ws3.gif)
Hence MS-DOS actually has a CP/M core deep deep inside, and therefore the amount of work needed to get a CP/M-86 program to run under MS-DOS was limited (not to a single byte, but manageable). QDOS was later bought by Microsoft and made into MS-DOS. Unfortunately that took so long to get to market that QDOS was written to have SOMETHING to run programs on, and that was essentially a quick reimplementation of the CP/M functions (but with a different syntax). That version was later called CP/M-80 to differentiate it from CP/M-86 for the 8086 processor. Everything with a disk drive intended for work ran CP/M. Legend: + Added file Changed file Renamed file Nothing changed List of files: PRINT.TST (WordStar 3.30 DOS NEC APC OEM) WINSTALL.CMD (WordStar 3.30 CP/M-86 1) WS.INS (WordStar 3.30 CP/M-86 1) WSMSGS.OVR (WordStar 3.30 DOS). CP/M (Control Program for Microcomputers) was written by Gary Kildall of Digital Research several years earlier and had become the first operating system for microcomputers in general use.Īn important thing to understand is that at the time 16-bit 8086 machines was just coming out to replace the current 8-bit machines, where the CP/M operating system was the Windows of the day. WordStar diskette of WordStar for CP/M-86 operating system. QDOS had been developed as a clone of the CP/M eight-bit operating system in order to provide compatibility with the popular business applications of the day such as WordStar and dBase. Author company was purchased by MicroPro and NewWord was re-released as WordStar 4.0 History by submittor. MS-DOS 1.0 was actually a renamed version of QDOS (Quick and Dirty Operating System), which Microsoft bought from a Seattle company, appropriately named Seattle Computer Products, in July 1981.
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The software build was done on 8" floppies and the binary (executable) files were then transferred to the IBM PC by serial cable. The actual port was done by a group of Irish programmers using Intel development systems, which ran the ISIS II operating system.
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In one single all-night session Jim Fox patched the CP/M-86 version of WordStar to make it run under MS-DOS on the IBM PC so that it could be demonstrated to Rubenstein. WORDSTAR and CP/M Made Easy by LEE, JD Paperback Book The Fast Free Shipping. Sounds a bit exaggerated, found some WordStar history here