* LAP6 format tapes
* These LINC tapes were origionally 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>
*
* 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>
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.     <a href="classic-test-t1.jpg">picture 1</a>
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>
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>
lap6-mymaster.linc	Block 0 & 4 bad. Blocks are empty. Minimal LAP6 tape.    <a href="lap6-mymaster-t1.jpg">picture 1</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>
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>
tfftmod.linc	FFT and other signal processing.    <a href="tfftmod-t1.jpg">picture 1</a> <a href="tfftmod-t2.jpg">picture 2</a>