* 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.
* <a href="/ftp/images/GJohns/Music Instructions-m.pdf">Music instructions</a> and <a href="/ftp/images/GJohns/LINC_music_cd.zip">173 MB of music recordings, see Readme.txt in zip</a>
*
* 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 href="/ftp/images/GJohns/lap6-mymaster-read-error.png">a transition is missing from both data bit 1 redundant tracks for the word I looked at</a>. 
* 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.

12may81-master.linc	Not sure what the programs do.     <a href="12may81-master-t1.jpg">picture 1</a> <a href="12may81-master-t2.jpg">picture 2</a>
1969-lap6-tv-chann-2.linc	Floating point programs. Filtering & unknown purpose. Padding block -4 may be bad.     <a href="1969-lap6-tv-chann-2-t1.jpg">picture 1</a>
1971_ulind.linc	Bouncing ball, Teletype routines, and unknown function JANC programs. <a href="1971_ulind-t1.jpg">picture 1</a> <a href="1971_ulind-t2.jpg">picture 2</a>
arith.linc	Arithmetic routines.  <a href="arith-t1.jpg">picture 1</a> <a href="arith-t2.jpg">picture 2</a>
classic-test.linc	LINC diagnostic tape. No index. No read error but block 35 (test 31) is bad containing only 7xxx words and block 41 (test 35) is identical to block 42  <a href="classic-test-t1.jpg">picture 1</a>
classic-test-fixed.linc	LINC diagnostic tape. No index. Tape above corrected from paper copy of tests.
cuddly-peter-clark.linc	THE NEVER-ENDING SEARCH FOR PERFECT, AMICABLE, AND SOCIABLE NUMBERS. Also display programs.     <a href="cuddly-peter-clark-t1.jpg">picture 1</a> <a href="cuddly-peter-clark-t2.jpg">picture 2</a>
cuddly-sim-file.linc	More cuddly. cudbugs manuscript block 344 is all 0's.     <a href="cuddly-sim-file-t1.jpg">picture 1</a> <a href="cuddly-sim-file-t2.jpg">picture 2</a>
game-tape.linc	Games.   <a href="game-tape-t1.jpg">picture 1</a> <a href="game-tape-t2.jpg">picture 2</a> <a href="game-tape-t3.jpg">picture 3</a>
GCJ-seq1.linc	No index.  <a href="GCJ-seq1.png">Tape has big dropouts on one of redundant tracks</a> No read errors.  <a href="GCJ-seq1-t1.jpg">picture 1</a> 
GCJ2-inttest.linc	Some music files. Block 8 bad. No file using that block. <a href="dropout.pdf">Bad dropout</a>. Inspected tape and didn't see physical cause.      <a href="inttest-t1.jpg">picture 1</a> <a href="inttest-t2.jpg">picture 2</a>
GCJ3_ASR-33.linc	Bad tape block check & dump programs, random number display. <a href="GCJ3_ASR-33-t1.jpg">picture 1</a>
JANC.linc	Bouncing ball, JANC, memory test. <a href="JANC-t1.jpg">picture 1</a> <a href="JANC-t2.jpg">picture 2</a>
lab_code_1979.linc	Unknown what programs do. <a href="lab_code_1979-t1.jpg">picture 1</a> <a href="lab_code_1979-t2.jpg">picture 2</a>
LAP6-backup.linc	No index. <a href="LAP6-backup-t11.jpg">picture 1</a>
lap6-mymaster.linc	Block 0 & 4 bad. Blocks are empty. Minimal LAP6 tape.     <a href="lap6-mymaster-t1.jpg">picture 1</a>
Moore_V.E.backup.linc	More programs that don't say what they do. <a href="Moore_V.E.backup-t1.jpg">picture 1</a> <a href="Moore_V.E.backup-t2.jpg">picture 2</a>
music.linc	Music files.      <a href="music-t1.jpg">picture 1</a>
music0.linc	More music files.      <a href="music0-t1.jpg">picture 1</a>
music-lap6.4.linc	Music player. LAP6 system blocks 195, 197, and 198 bad.     <a href="music-lap6.4-t1.jpg">picture 1</a>
new_programs.linc	Unknown programs.  <a href="new_programs.png">Tape has all data tracks erased at beginning of tape</a>. Blocks 0-187 which don't contain files are bad.  <a href="new_programs-t1.jpg">picture 1</a> <a href="new_programs-t2.jpg">picture 2</a> 
simbc-backup.linc	Octal dump and other unknown programs.    <a href="simbc-backup-t1.jpg">picture 1</a> <a href="simbc-backup-t2.jpg">picture 2</a>
TT2400.linc	Math routines, bouncing ball, Teletype, tape check/dump. Arith tape newer. <a href="TT2400-t1.jpg">picture 1</a>
tfftmod.linc	FFT and other signal processing.     <a href="tfftmod-t1.jpg">picture 1</a> <a href="tfftmod-t2.jpg">picture 2</a>
xtlk_data.linc	No index. <a href="xtlk_data-t1.jpg">picture 1</a>