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89 lines
3.7 KiB
Plaintext
89 lines
3.7 KiB
Plaintext
Index of folder retro-220/software/SNAP-Assembler:
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Source and object files for Michael Mahon's SNAP-1E assembler for the
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Burroughs 220, written while he was a student at the California
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Institute of Technology in the mid-1960s.
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SNAP has a columnar assembly notation and was written for the paper-tape
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and magnetic-tape 220 configuration at CalTech -- no punched cards. It
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was also written for printed output to the Burroughs Whippet printer, an
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early, high-speed electrostatic printer originally developed for the
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U.S. military.
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Michael has generously allowed me to offer his assembler as part of the
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retro-220 project. See his web site at http://www.michaeljmahon.com/ for
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the original assembler files and documentation, information on his 220
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emulator written for the Apple //e (!), and a number of documents on the
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220.
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The paper-tape image files on Michael's web site are encoded for use by
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his emulator and are incompatible with the retro-220 emulator's paper-
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tape implementation. See /software/tools/Mahon-PT-Xlate.wsf in the
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retro-220 project repository for a Windows VBScript utility that will
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translate from his paper-tape format to the one used by retro-220.
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The object tape for the assembler is designed to be loaded on paper-tape
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reader 0 (i.e., 10). Source code, however, is read from paper-tape
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reader 1. The assembler halts after loading to allow you to load the
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source tape and change the reader's unit designate.
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Assembled object code is written to paper-tape punch 1. The assembly
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listing is output to the SPO, which at CalTech was the high-speed
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Whippet printer. Miscellaneous assembly messages are output to teletype
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printer 0 (10), which in retro-220 can be configured to be the same
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device as the SPO. Magnetic tape unit 1 is used as a scratch tape. It
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must have an "edited" (i.e., erased and not formatted) tape mounted.
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Unless otherwise specified, all files are in standard Windows text
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format, with carriage-return/line-feed delimiters.
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SNAP1E.SRC-retro.pt
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Source code for the SNAP-1E assembler, written in itself, using the
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paper-tape image format required by the retro-220 emulator. This is
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not a particularly readable format, so see the listing below for a
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better presentation.
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SNAP1E.OBJ-retro-pt.
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Loadable object code for the SNAP-1E assembler, in the paper-tape
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image format required by the retro-220 emulator. See the notes above
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and the assembler manual below for more information on running the
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assembler.
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SNAP1E.Listing-retro.txt
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Assembly listing of the SNAP-1E assembler, as generated from the
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retro-220 emulator. Because of the I/O device configuration for the
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system at CalTech, it used a few different internal character codes
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than those for a standard 220. Thus, the listing needs to be viewed
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with the following substitutions in mind. Fortunately, except for
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"+", these were only used in comments.
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CalTech retro-220
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= #
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+ $
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( ¤ (U0164, the "lozenge")
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) ¤ (also lozenge: a quirk of Cardatron code
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translation)
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SNAP1E.Manual.pdf
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Manual for the assembler, OCR-ed by Michael from his original IBM
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1403 line-printer listing.
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SIEVE.SRC-retro.pt
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Assembler source for a prime-number sieve written in SNAP-1E.
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SIEVE.OBJ-retro.pt
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Loadable object code for the SIEVE program, in the paper-tape image
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format required by the retro-220 emulator. Load the object tape on
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paper-tape reader 0. This program writes its output to magnetic tape
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unit 1 in 100-word blocks. The tape unit must be loaded with an
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edited, unformatted tape.
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SIEVE.Listing-retro.txt
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Assembler listing of the SIEVE program.
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Paul Kimpel
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January 2018
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