PDP-8 File list for GJohns

LAP6 format tapes
These LINC tapes were originally from Gerald C. Johns and loaned by Maury Pepper.
These are tapes for the original LINC computer and variants.
Music instructions and 173 MB of music recordings, see Readme.txt in zip

Block numbers on this page are in decimal

Music-lap6.4 bad blocks difficult to investigate cause of read errors since
LAP6 doesn't match between tapes.
Lap6-mymasterNo file in those blocks. The blocks at the beginning of the tape
seems to be fixed contents after marking. The checksums are all the same
though on blocks 0 & 4 a few words differ. It appears that
a transition is missing from both data bit 1 redundant tracks for the word I looked at.
Overlayed block 3 and 4 with block 4 in red where you can see the missing flux
transition. Seems odd the tape would have lost the transition in storage. Also
seems odd that a master tape wouldn't have been rewritten if it was bad.

Clicking on the image name will bring up a directory from which you can download or view individual files.

 Image Name  Description 
 12may81-master.linc Not sure what the programs do. picture 1 picture 2  
1969-lap6-tv-chann-2.linc Floating point programs. Filtering & unknown purpose. Padding block -4 may be bad. picture 1
1971_ulind.linc Bouncing ball, Teletype routines, and unknown function JANC programs. picture 1 picture 2
arith.linc Arithmetic routines. picture 1 picture 2
classic-test.linc LINC diagnostic tape. No index. picture 1
cuddly-peter-clark.linc THE NEVER-ENDING SEARCH FOR PERFECT, AMICABLE, AND SOCIABLE NUMBERS. Also display programs. picture 1 picture 2
cuddly-sim-file.linc More cuddly. cudbugs manuscript block 344 is all 0's. picture 1 picture 2
game-tape.linc Games. picture 1 picture 2 picture 3
GCJ-seq1.linc No index. Tape has big dropouts on one of redundant tracks No read errors. picture 1
GCJ2-inttest.linc Some music files. Block 8 bad. No file using that block. Bad dropout. Inspected tape and didn't see physical cause. picture 1 picture 2
GCJ3_ASR-33.linc Bad tape block check & dump programs, random number display. picture 1
JANC.linc Bouncing ball, JANC, memory test. picture 1 picture 2
lab_code_1979.linc Unknown what programs do. picture 1 picture 2
LAP6-backup.linc No index. picture 1
lap6-mymaster.linc Block 0 & 4 bad. Blocks are empty. Minimal LAP6 tape. picture 1
Moore_V.E.backup.linc More programs that don't say what they do. picture 1 picture 2
music.linc Music files. picture 1
music0.linc More music files. picture 1
music-lap6.4.linc Music player. LAP6 system blocks 195, 197, and 198 bad. picture 1
new_programs.linc Unknown programs. Tape has all data tracks erased at beginning of tape. Blocks 0-187 which don't contain files are bad. picture 1 picture 2
simbc-backup.linc Octal dump and other unknown programs. picture 1 picture 2
TT2400.linc Math routines, bouncing ball, Teletype, tape check/dump. Arith tape newer. picture 1
tfftmod.linc FFT and other signal processing. picture 1 picture 2
xtlk_data.linc No index. picture 1

About green bar paper


Feel free to contact me, David Gesswein djg@pdp8online.com with any questions, comments on the web site, or if you have related equipment, documentation, software etc. you are willing to part with.  I am interested in anything PDP-8 related, computers, peripherals used with them, DEC or third party, or documentation. 

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