TOPS-20 User Wiki

User Tools

Site Tools

Trace:
tutorials:basic

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision 		Previous revision
tutorials:basic [2024/10/01 07:02]
papa 		tutorials:basic [2024/10/04 04:14] (current)
papa [Using BASIC]
Line 1: Line 1:
 ====== Using BASIC ====== ====== Using BASIC ======
  
-//[Is an explanation of BASIC needed?]// +TWENEX's BASIC programming system is **LOTS BASIC**, developed at Stanford University. 
-  + 
-TWENEX's BASIC interpreter is **LOTS BASIC**, developed at Stanford University.+Start BASIC with the EXEC command ''BASIC''. Return to EXEC with the BASIC command ''MONITOR''.
  
 The following tutorial is adapted from chapter 17. "Using BASIC" in //LOTS DECSYSTEM-20 Overview Manual//(( The following tutorial is adapted from chapter 17. "Using BASIC" in //LOTS DECSYSTEM-20 Overview Manual//((
Line 140: Line 140:
 | |Deletes the specified file. More than one file can be specified; for example, UNSAVE DSK:ONE.FOR,SX:TEST.BAS| | |Deletes the specified file. More than one file can be specified; for example, UNSAVE DSK:ONE.FOR,SX:TEST.BAS|
  
-In the commands above which accept such arguments, if "dev:" is omitted, "DSK:" is assumed; if ".typ" is omitted, ".BAS" is assumed. A null file type is indicated by "." with no "typ". The SAVE, REPLACE, and UNSAVE commands allow the "filenm" part of the argument to be omitted, in which case ".typ" must be omitted also and the name and ile type of the program currently in core are assumed. +In the commands above which accept such arguments, if "dev:" is omitted, "DSK:" is assumed; if ".typ" is omitted, ".BAS" is assumed. A null file type is indicated by "." with no "typ". The SAVE, REPLACE, and UNSAVE commands allow the "filenm" part of the argument to be omitted, in which case ".typ" must be omitted also and the name and file type of the program currently in core are assumed. 
  
-The keywords of commands (CATALOG, LIST, etc.) may be abbreviated to their first three letters. Only the three letter abbreviation and the full word form are legal; intermediate abbreviations such as CATAL, for example, are not allowd. If an intermediate abbreviation is used, the extra letters will be seen as part of the command argument (because BASIC does not see blank spaces or tabs at command level.) For example, "CATAL SX:" would be seen as a request to catalog the device "ALSX:". An example of a legal abbreviated command is: CAT DOC:+The keywords of commands (CATALOG, LIST, etc.) may be abbreviated to their first three letters. Only the three letter abbreviation and the full word form are legal; intermediate abbreviations such as CATAL, for example, are not allowed. If an intermediate abbreviation is used, the extra letters will be seen as part of the command argument (because BASIC does not see blank spaces or tabs at command level.) For example, "CATAL SX:" would be seen as a request to catalog the device "ALSX:". An example of a legal abbreviated command is: CAT DOC:
  
 Whenever BASIC finishes executing a command, it types "READY". It does not answer "READY" after deleting a line by the alternate method described under the delete command or after receiving a line for the program currently in core from the user's terminal. Whenever BASIC finishes executing a command, it types "READY". It does not answer "READY" after deleting a line by the alternate method described under the delete command or after receiving a line for the program currently in core from the user's terminal.
tutorials/basic.1727766146.txt.gz · Last modified: 2024/10/01 07:02 by papa

Page Tools

Donate Powered by PHP Valid HTML5 Valid CSS Driven by DokuWiki