MACRO-10 is an
assembly language
In computing, assembly language (alternatively assembler language or symbolic machine code), often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence bet ...
with extensive
macro facilities for
DEC's
PDP-10
Digital Equipment Corporation (DEC)'s PDP-10, later marketed as the DECsystem-10, is a mainframe computer family manufactured beginning in 1966 and discontinued in 1983. 1970s models and beyond were marketed under the DECsystem-10 name, especi ...
-based
Mainframe computer
A mainframe computer, informally called a mainframe or big iron, is a computer used primarily by large organizations for critical applications like bulk data processing for tasks such as censuses, industry and consumer statistics, enterprise ...
systems, the
DECsystem-10 and the
DECSYSTEM-20. MACRO-10 is implemented as a
two-pass assembler
In computing, assembly language (alternatively assembler language or symbolic machine code), often referred to simply as assembly and commonly abbreviated as ASM or asm, is any low-level programming language with a very strong correspondence bet ...
.
Programming examples
A simple "
Hello, world!" program in MACRO-10 assembler, to run under
TOPS-10
TOPS-10 System (Timesharing / Total Operating System-10) is a discontinued operating system from Digital Equipment Corporation (DEC) for the PDP-10 (or DECsystem-10) mainframe computer family. Launched in 1967, TOPS-10 evolved from the earlier "Mo ...
, adapted from a specimen in a large collection of "Hello World" programs in various languages:
TITLE HELLO WORLD
; 'Hello world' in MACRO-10 for TOPS-10
SEARCH UUOSYM ; Make UUO symbol names available
LAB: ASCIZ /Hello, world!
/ ; NUL-terminated ASCII string with CRLF
START: RESET ; Initialise job to clean runtime state
OUTPUT: OUTSTR LAB ; Output string starting at LAB:
MONRT. ; Return to monitor
JRST OUTPUT ; Restart at OUTPUT: if user CONTINUEs job
END START ; End assembly, set program start address
If this program is saved in the file , it can be assembled, linked and run like this (the TOPS-10 system prompt is the
. at the start of lines):
.COMPILE HELLO.MAC /DLIST
MACRO: HELLO
EXIT
.LOAD HELLO
LINK: Loading
EXIT
.SAVE
HELLO saved
.RUN
Hello, world!
.
The assembly listing file generated by the
/DLIST (Disk LISTing) option to the
COMPILE command:
HELLO WORLD MACRO %53B(1247) 17:29 7-Apr-:9 Page 1
HELLO MAC 7-Apr-:9 17:29
TITLE HELLO WORLD
; 'Hello world' in MACRO-10 for TOPS-10
SEARCH UUOSYM ; Make UUO symbol names available
000000' 110 145 154 154 157 LAB: ASCIZ /Hello, world!
000001' 054 040 167 157 162
000002' 154 144 041 015 012 / ; NUL-terminated ASCII string with CRLF
000003' 000 000 000 000 000
000004' 047 00 0 00 000000 START: RESET ; Initialise job to clean runtime state
000005' 051 03 0 00 000000' OUTPUT: OUTSTR LAB ; Output string starting at LAB:
000006' 047 01 0 00 000012 MONRT. ; Return to monitor
000007' 254 00 0 00 000005' JRST OUTPUT ; Restart at OUTPUT: if user CONTINUEs job
000004' END START ; End assembly, set program start address
NO ERRORS DETECTED
PROGRAM BREAK IS 000010
CPU TIME USED 58:25.100
36P CORE USED
HELLO WORLD MACRO %53B(1247) 17:29 7-Apr-:9 Page S-1
HELLO MAC 7-Apr-:9 17:29 SYMBOL TABLE
LAB 000000'
MONRT. 047040 000012
OUTPUT 000005'
OUTSTR 051140 000000
RESET 047000 000000
START 000004'
The date ":9" is a
Year 2000 problem
The term year 2000 problem, or simply Y2K, refers to potential computer errors related to the Time formatting and storage bugs, formatting and storage of calendar data for dates in and after the year 2000. Many Computer program, programs repr ...
.
A more complex MACRO-10 example program, which renders one version of the
99 Bottles of Beer song, may be examined at the "99 Bottles of Beer" web site.
For larger bodies of code, much of the MACRO-10 code for the TOPS-10 and TOPS-20 systems is available in the Trailing Edge PDP-10 tape archives.
Trailing Edge PDP-10 software archive
/ref>
References
External links
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{{Authority control
Assembly languages
Digital Equipment Corporation