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Type: Posts; User: oldmicros

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  1. Replies
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    By not functional I mean unable to read/write....

    By not functional I mean unable to read/write. Motor movement seems OK in both directions.
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    Amazing restoration job! Thanks for sharing. ...

    Amazing restoration job! Thanks for sharing.

    Makes me realize that this is really a daunting task.

    My machine looks to be in somewhat better shape than yours but still a lot of troubleshooting...
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    PDP-8L Modules

    I've acquired an 8L and have begun evaluating its condition.

    Looks fairly complete. Is missing one plastic switch lever but otherwise front panel looks pretty good.

    Did an inventory of the...
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    I have not had any success with generating an...

    I have not had any success with generating an EOF. Tried all the above suggestions.

    I am starting to think that ON EOF is only handled for the internal tape drive.

    I started looking at the 4051...
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    I've also read only values 0-9 are valid. So...

    I've also read only values 0-9 are valid. So maybe GPIB address or some kind of logical assignment number.

    In any case, I'm attempting to create a valid EOF at the end of binary data and so far...
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    I have been making (slow) progress on the tape...

    I have been making (slow) progress on the tape emulator.
    I have implemented and tested FIND, MARK, OLD, SAVE, HEADER.

    I am currently testing WRITE/READ functionality.
    Does anyone know what the...
  7. Replies
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    Dave, Makes sense to me. Thanks for all your...

    Dave,

    Makes sense to me. Thanks for all your research on this.

    If I implement this suspected behavior in my emulator, how would I verify correct functionality?
    Could I use "ON EOF" while...
  8. Replies
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    Dave, The header I was referring to is the 2...

    Dave,

    The header I was referring to is the 2 byte header preceeding binary data.

    The file header is definitely generated by the 4924 and I do that in my emulator.

    My suspicion is that the...
  9. Replies
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    Dave, My understanding of the 4924 side of...

    Dave,

    My understanding of the 4924 side of things is that it simply reads and writes bytes as directed by the 4051.
    It does not interpret the header during a "READ" or create the header during a...
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    Monty, I took a somewhat different approach....

    Monty,

    I took a somewhat different approach. Since my original use for this device was an HP drive emulator, I reused the concept from that. It uses an image of a disk on the SD card as one file....
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    Dave, I have a barebones 4924 tape emulator...

    Dave,

    I have a barebones 4924 tape emulator functioning using a PIC and an SD card. By barebones I mean it only handles FIND, MARK, OLD, and SAVE. I have been able to create tape images on the SD...
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    Dave, Thanks. I was very happy when it was...

    Dave,

    Thanks. I was very happy when it was alive again! I used one back in college and always remembered how cool it was.

    Monty,

    Thanks for the link to your previous thread. Sounds like you...
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    Dave, Thanks. I was glad to get it up and...

    Dave,

    Thanks. I was glad to get it up and running.

    I used one 35 years ago while in college and always remembered what a cool machine it was.

    I am in the US.

    I'm not sure a general...
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    Tektronix 4051 Tape Emulator

    I've read with interest the recent 4051 discussions here and have noticed that a tape emulator has been mentioned. I too have recently repaired a 4051 and since the tape drive is not functional, I am...
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