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Thread: A new G888 manchester read/write module

  1. #21
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    Is the tape format documented somewhere? I looked around, but the only reference I could find was in the 18bit_extract.c file mentioned by anders_bzn

  2. #22

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    Quote Originally Posted by m_thompson View Post
    I can see a directory structure on the tapes using my Windows program.

    Attachment 50542
    I tested to view the directory in a SimH PDP-15 running DOS-15 V2A and got this. Similar but not the same:

    Code:
    >L TT_DT2
    
         14-JAN-83
     DIRECTORY LISTING  
        213 FREE BLKS
         17 USER FILES
        367 SYSTEM BLKS 
     .LIBR  BIN     141    151
     DDT9   BIN     142     12
     .LOAD  BIN     143      7
     CHAIN  BIN     144     11
     INTEGE EAE     217      1
     INTEGE NON     236      1
     REAL   EAE     267      4
     REAL   NON     225      4
     FNEW   SRC     257     14
     FNEW   BIN     263      1
     FOCAL  BIN     161     21
     SRCCOM BIN     270     16
     DTCOP  BIN     353      3
     TIME   BIN     147      1
     TIME10 BIN     154      1
     KM9    SYS       0
     .SGEN2 SYS      36
     SKPBLK SYS      44
     UPDATE SYS      45
     IOBLK  SYS      55
     .SYSLD SYS      56
     EXECUT SYS      67
     ^QAREA SYS     101
     PATCH  SYS     652
     EDIT   SYS     657
     PIP    SYS     671
     F4     SYS     711
     F4A    SYS     742
     MACRO  SYS     771
     MACROA SYS    1020
     DUMP   SYS    1044
     .SGEN1 SYS    1050
     CONV   SYS    1064
    I checked other files and some are readable in this way. Many give garbage listing output. Some kind of incompatibility with DOS-15 V2A, but I don't know more details. Later DOS file system on tape?

  3. #23

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    Tested SIMH with KM9-15 V5B and the results are approximately the same. Files readable in DOS-15 V2A seems to be readable in KM9-15 V5B. Which makes sense

  4. #24
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    I will look at the output from my Windows program and see if I can get it to match the output from DOS/KM9.
    Makes want to get the RICM PDP-9 out of the warehouse, and get the TC02 connected and working.
    Member of the Rhode Island Computer Museum
    http://www.ricomputermuseum.org

  5. #25

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    I guess that the tapes have different formats, there are markings like "FORM 1", FORM2", "FORM PC" on the tapes. Some marks are harder to read than others. I think I got all the bits of the tapes correct. The ones that got badblocks when I read them has notes in the text file "list.txt"

    Is the format (not the structure on the tapes) documented somewhere? I have browsed some documentation available on bitsavers.org but couldn't find anything. I wander if I have stuff here that is not yet scanned...

  6. #26

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    Quote Originally Posted by m_thompson View Post
    I will look at the output from my Windows program and see if I can get it to match the output from DOS/KM9.
    Makes want to get the RICM PDP-9 out of the warehouse, and get the TC02 connected and working.
    Do you have DECTapes for that machine as well?

  7. #27
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    Quote Originally Posted by anders_bzn View Post
    Is the format (not the structure on the tapes) documented somewhere?
    Indirectly, in the driver code.
    These systems are a little unusual in that the file structure is not implemented across devices, but is unique to each driver.
    Because of that, it doesn't surprise me that they might have changed the file system between releases.

  8. #28
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    Quote Originally Posted by anders_bzn View Post
    Do you have DECTapes for that machine as well?
    Charles Lasner donated a TC02, and we can borrow two TU55 drives from the PDP-8/I. We don't have any DECtapes containing an OS that would run on the system, so we would have to make them using Dumprest.
    Member of the Rhode Island Computer Museum
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  9. #29
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    Quote Originally Posted by Al Kossow View Post
    Indirectly, in the driver code.
    These systems are a little unusual in that the file structure is not implemented across devices, but is unique to each driver.
    Because of that, it doesn't surprise me that they might have changed the file system between releases.
    Section 4.6.2, File-Oriented DECtape, in the DEC-15-MR2B-D Advanced Monitor Software System Programmers Reference Manual, describes the DECtape structure. There is usually a directory at block 100 (octal). Some of the tape images that Mattis just made don't have a recognizable directory anywhere.

    This is a good directory:


    Offset 0 1 2 3 4 5 6 7 |--------6-Bit---------| |------7-Bit-------|
    000000: 777777 777777 777777 777777 777777 777675 736757 367573 >=;7/↑=; ^^=
    000010: 655377 571635 777777 767553 265536 757365 430614 306143 5+ /N] >=+V-↑=;5 FLX1 /N5-5^F 1
    000020: 061430 614306 143061 430614 306143 061430 614306 143077 FLX1 FLX1 FLX1 FLX1 FLX 1F 1F1F 1F
    000030: 777777 777777 777777 777777 777777 777777 777777 777777
    000040: 561411 022200 021116 400141 040424 710000 021116 400142 .LIBR BIN A!DDT9 BIN A" 0H$\ $ 0 ' $ 1
    000050: 561417 010400 021116 400143 031001 111600 021116 400144 .LOAD BIN A CHAIN BIN A$ 0 $ 1 \ $ 2
    000060: 111624 050705 050105 400217 111624 050705 161716 400236 INTEGEEAE BOINTEGENON B↑ 9 Q , G 9 Q < O
    000070: 220501 140000 050105 400267 220501 140000 161716 400225 REAL EAE B7REAL NON BU $ \ , $ \ < J
    000100: 061605 270000 232203 400257 061605 270000 021116 400263 FNEW SRC B/FNEW BIN B3 8* &H W 8* $ Y
    000110: 061703 011400 021116 400161 232203 031715 021116 400270 FOCAL BIN A1SRCCOMBIN B8 < $ 8&H 3 $
    000120: 042403 172000 021116 400353 000000 000000 000000 000000 DTCOP BIN C+ P $
    000130: 241115 050000 021116 400147 241115 056160 021116 400154 TIME BIN A┤TIME10BIN A, ($P $ 3($ 8 $ 6
    000140: 000000 000000 000000 000000 000000 000000 000000 000000
    000150: 000000 000000 000000 000000 000000 000000 000000 000000
    000160: 000000 000000 000000 000000 000000 000000 000000 000000
    000170: 000000 000000 000000 000000 000000 000000 000000 000000
    000200: 777777 777777 777777 777777 777777 774000 000000 000000
    000210: 000000 000000 000000 000000 000000 000000 000000 000000
    000220: 000000 000000 000000 000000 000000 000000 000000 000077
    000230: 777777 777777 777777 777777 777777 777777 777777 777777
    000240: 131571 000000 233123 400000 562307 051662 233123 400036 KM9 SYS .SGEN2SYS ↑ 7H & L8SY&
    000250: 231320 021413 233123 400044 252004 012405 233123 400045 SKPBLKSYS $UPDATESYS &- # & *\ &
    000260: 111702 141300 233123 400055 562331 231404 233123 400056 IOBLK SYS -.SYSLDSYS . < B& MJ3 &
    000270: 053005 032524 233123 400067 362101 220501 233123 400101 EXECUTSYS 7↑QAREASYS AA (5*& <D &
    000300: 200124 031000 233123 400652 050411 240000 233123 400657 PATCH SYS F*EDIT SYS F/ 2 & U J\ & W
    000310: 201120 000000 233123 400671 066400 000000 233123 400711 PIP SYS F9F4 SYS GI % & P &
    000320: 066401 000000 233123 400742 150103 221700 233123 400771 F4A SYS G"MACRO SYS G9 P & #&
    000330: 150103 221701 233123 401020 042515 200000 233123 401044 MACROASYS HPDUMP SYS H$ #& T &
    000340: 562307 051661 233123 401050 031716 260000 233123 401064 .SGEN1SYS H(CONV SYS H4 L8SX& < &
    000350: 000000 000000 000000 000000 000000 000000 000000 000000
    000360: 000000 000000 000000 000000 000000 000000 000000 000000
    000370: 000000 000000 000000 000000 000000 000000 000000 000000
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  10. #30
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    Quote Originally Posted by m_thompson View Post
    Section 4.6.2, File-Oriented DECtape, in the DEC-15-MR2B-D Advanced Monitor Software System Programmers Reference Manual, describes the DECtape structure. There is usually a directory at block 100 (octal). Some of the tape images that Mattis just made don't have a recognizable directory anywhere.
    Guess I need to get off my butt and scan the REDAC PC layout system source listings he sent me.
    I suspect some of the tapes will be unique to that.

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