Table of Contents
| The Worlds of UNIX | 42 | 
|  A discussion of the development and future of UNIX introduces the articles that follow  |  
  | 
| Mark Rollins | 
| The Evolution of UNIX from 1974 to present | 44 | 
|  UNIX in the laste decade: the key ideas that made it evolve, and the idividuals who contributed its growth  |  
  | 
| Ian F. Darwin, Geoff Collyer | 
| A Conversation with Andrew D. Hall | 58 | 
|  Andy Hall, Director of the Bell Labs System V Development, talks about the future of UNIX  |  
  | 
| Codata 3300, Running Unisoft UNIX | 68 | 
|  Codata offers a reliable implementation of UNisoft UNIX at a moderate price  |  
  | 
| Bruce H. Hunter | 
| How Portable is C? | 84 | 
|  Avoid some of the most common pointer and data typing proplems that arise when programming with C  |  
  | 
| Michael Tilson | 
| PFIX86 from Phoenix | 92 | 
|  Phoenix Software has released a symbolic debugger for a standard PC/MS-DOS environment  |  
  | 
| Michael Olfe | 
| The MS-DOS PROMPT Command has more Power than You Think | 100 | 
|  PROMPT s ore than a simple command -- it will display the current directory path, change the color/graphics display mode, and redefine the keyboard  |  
  | 
| Charles Petzold | 
| X.25 Communications Protocol | 108 | 
|  Part 3: Learn how to implement X.25 using the Intel 8270 and Western Digital WD2511 chips  |  
  | 
| Eric L. Beser | 
| Editor's Page | 6 | 
|  Microsystems says goodbye  |  
  | 
| Mark Rollins | 
| News and Views | 8 | 
|  IBM releases PC/AT; Japan penetrating U.S. PC market  |  
  | 
| Sol Libes | 
| The S-100 Bus | 12 | 
|  Tips on buying an S-100; safe power switching; slow EPROMs  |  
  | 
| Dave Hardy | 
| The UNIX File | 16 | 
|  Shows, shell efficiency, and shibboleths  |  
  | 
| Ian F. Darwin | 
| MS-DOS Window | 24 | 
|  Bulletin Boards for the PC  |  
  | 
| Hank Kee | 
| Graphics Palette | 30 | 
 | 
| David McCune |