https://github.com/larsbrinkhoff/pdp10-its-disassembler

Disassembler and other tools for files in ITS formats
https://github.com/larsbrinkhoff/pdp10-its-disassembler

disassembler disk-image incompatible-timesharing-system pdp-10 tape-images tenex tops-10 tops-20 tymcom-x

Last synced: about 2 months ago
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Disassembler and other tools for files in ITS formats

• Host: GitHub
• URL: https://github.com/larsbrinkhoff/pdp10-its-disassembler
• Owner: larsbrinkhoff
• License: gpl-2.0
• Created: 2013-04-06T19:20:48.000Z (over 11 years ago)
• Default Branch: master
• Last Pushed: 2024-06-10T11:04:45.000Z (7 months ago)
• Last Synced: 2024-10-13T11:06:39.635Z (2 months ago)
• Topics: disassembler, disk-image, incompatible-timesharing-system, pdp-10, tape-images, tenex, tops-10, tops-20, tymcom-x
• Language: C
• Homepage:
• Size: 5.82 MB
• Stars: 19
• Watchers: 7
• Forks: 13
• Open Issues: 32
• Metadata Files:
  • Readme: README
  • License: COPYING

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README

        
BINARY IMAGE format:

  2 36-bit words in 9 8-bit bytes.

CORE DUMP format:

  The TM03 packs each 36-bit word into 5 consecutive tape frames.  The leftmost

  32 bits of the word are stored in the first 4 tape frames (ordered from left

  to right), and the remaining four bits are stored in the low half of the 5th

  tape frame.  The left half of the 5th bit is written as 0000 and treated as

  "don't care" data on read.

INDUSTRY/ASCII/ANSI COMPATIBLE format:

  See below.

EVACUATE format:

  ITS dump format.

/*

 * Format for storing 36 bits into 5 tape frames

 *    DEC core-dump mode           ANSI compatible mode

 * |00 01 02 03 04 05 06|07     |__ 00 01 02 03 04 05 06|

 *  08 09 10 11 12 13|14 15     |__ 07 08 09 10 11 12 13|

 *  16 17,18 19 20|21 22 23     |__ 14 15 16 17 18 19 20|

 *  24 25 26 27|28 29 30 31     |__ 21 22 23 24 25 26 27|

 *  __ __ __ __ 32 33 34|35|    |35|28 29 30 31 32 33 34|

 * Note: "|" separate the 7-bit bytes, "__" are unused bits (which are zero).

 */