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--- tops-20 [2020/03/25 21:13]
smj
+++ tops-20 [2020/07/13 10:36] (current)
setala Added a missing @
@@ Line 30: / Line 30: @@
 | <SYSTEM> | SYSTEM: | The SYSTEM directory - The Monitor and system configuration live here |
 | <UNSUPPORTED> | UNS: | 3rd party programs such as games |
+**PROGRAMMING EXAMPLES USING "COMPILE", "LOAD" and "SAVE" COMMANDS**
+TOPS-20 supports many programming languages using a standard COMPILE/LOAD/SAVE model.  TOPS-20 is very helpful using command recognition and DWIM (Do What I Mean) without having to completely type out everything.  Here are few simple examples to get started:
+**FORTRAN-77**
+//NOTE: This formatting is punched card style - The first 5 and 6th columns are special//
+      @copy TTY: test.for                             ;A simple way to enter in TEXT from the terminal
+       TTY: => TEST.FOR.1
+               PROGRAM TEST                           ;Declare the name of the program
+               WRITE (5, 10)                          ;OUTPUT to the terminal (UNIT 5) at line 10
+       FORMAT(' TESTING 1 2 3!')              ;FORMAT the text for OUTPUT
+               END                                    ;END the program
+      ^Z                                              ;CTRL-Z closes the file
+      @type test.for                                  ;TYPE the test.for file and verify
+               PROGRAM TEST
+               WRITE (5, 10)
+       FORMAT(' TESTING 1 2 3!')
+               END
+      @compile test                                   ;COMPILE the file TEST
+      FORTRAN: TEST                                   ;COMPILE determined TEST is a FORTRAN program
+      TEST  	                                      ;TEST is now written out as a .REL file
+      @load test                                      ;LOAD the file (or EXECUTE TEST to LOAD and RUN)
+      LINK:	Loading
+      @save test                                      ;SAVE the loaded program to a .EXE file
+       TEST.EXE.1 Saved
+      @v test.*
+         LS:<SMJ.FORTRAN>
+       TEST.EXE.1;P775200         6 3072(36)    6-May-2020 15:42:13 SMJ
+         .FOR.1;P775200           1 71(7)       6-May-2020 15:41:09 SMJ
+         .REL.1;P775200           1 93(36)      6-May-2020 15:41:46 SMJ
+       Total of 8 pages in 3 files
+       @<smj.fortran>test                             ;Run the .EXE file
+       TESTING 1 2 3!
+       CPU time 0.09   Elapsed time 0.19
+For an excellent summary to get started with FORTRAN on TOPS-20, check out
+[[http://wiki.twenex.org/doku.php?id=tutorials:fortran]]
+**MACRO-20**
+MACRO is the assembler on TOPS-20.  Here is a simple example of a Hello World in MACRO
+       @COPY TTY:hello.mac                             ;A simple way to enter text into a file
+       title hello
+       entry output
+       search uuosym
+       hello:	asciz /Hello there.
+       /
+       output:	outstr hello
+       	monrt.
+       	end output
+       ^Z
+       @type hello.mac
+       title hello
+       entry output
+       search uuosym
+       hello:	asciz /Hello there.
+       /
+       output:	outstr hello
+       	monrt.
+       	end output
+       @compile hello
+       MACRO:	hello
+       EXIT
+       @load hello
+       LINK:	Loading
+       @save hello
+        HELLO.EXE.1 Saved
+       @<smj>hello
+       Hello there.
+Scans of original user and reference manuals can be found at:
+https://www.livingcomputers.org/Computer-Collection/Online-Systems/User-Documentation.aspx

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