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40 lines
1.0 KiB
Markdown
40 lines
1.0 KiB
Markdown
# Hello world in MIDAS
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Step by step guide on how to create a hello world in MIDAS.
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1. Login.
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2. Start EMACS and enter this program. You can skip the comments.
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```
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title hello
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a==1 ;Define two accumulators,
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b==2 ;A and B.
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ch==1 ;Output chanel number.
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start: .open ch,[.uao,,'tty] ;Open channel to TTY, for ASCII output.
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.lose
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move a,[440700,,hello] ;Load A with byte poiter to string.
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loop: ildb b,a ;Load B from string.
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jumpe b,[.logout 2,] ;End on zero byte.
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.iot ch,b ;Print byte.
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jrst loop
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hello: asciz /hello world/
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end start ;Specify entry point.
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```
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3. Save it as `hello 1` (^X^S) and exit (^X^C).
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4. Assemble it with MIDAS.
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:midas ts hello_hello
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5. Go back to EMACS with $P if you need to do edits.
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6. Run the program.
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:hello
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