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Type: Posts; User: Hutch

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  1. Replies
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    273

    @Eudimorphodon, Yeah, according to John Feagans,...

    @Eudimorphodon, Yeah, according to John Feagans, the prototype was based on the IBM Selectric typewriter, but in the end it was cheaper to use their sheet metal factory on Toronto that was already...
  2. Thread: PET 2001 Sound

    by Hutch
    Replies
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    3,544

    To be fair, the bit-bang speed is limited to 300...

    To be fair, the bit-bang speed is limited to 300 baud, so ...
  3. This might be of interest here. I was playing...

    This might be of interest here. I was playing around with a program called PETTerm and using a MAX232 TTL<>RS232 level converter to get 300 baud serial comms to RS232.
    PET Term includes it's own...
  4. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    The PET Can bit-bang a serial connection. It's...

    The PET Can bit-bang a serial connection. It's just that Commodore never included bit-bang routines in ROM so there's no standard for serial comms.
    I'm using the program PET Term which includes it's...
  5. Replies
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    New Photos of the wooden PET prototype

    This has been around Facebook and Twitter for a few weeks but I don't think it's been shared here yet. I thought it might be of interest to some Commodore enthusiasts here.

    I've been doing...
  6. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    FWIW, I just built one of these myself. I just...

    FWIW, I just built one of these myself.
    I just used a 1K ohm resistor to a Piezo speaker.
    I added 3.5mm audio jack to optionally connect to a powered speaker, and with that 1K ohm resistor and the...
  7. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    Where were you taking the output from a single...

    Where were you taking the output from a single resistor to go to the amp?

    Also worth noting that you can't use just one resistor. You need a POT or two resistors to divide the voltage.
    If you...
  8. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    1. Capacitors are not measured in OHMs. So I...

    1. Capacitors are not measured in OHMs. So I assume you used a 10 ohm potentiometer ?
    2. 10 Ohms is too small for the Potentiometer and will overload the output too much to hear anything. 10...
  9. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    Something this simple I think. (?) This will let...

    Something this simple I think. (?) This will let you adjust the output voltage from the full 5v to 0v. Without grounding one side of the pot, the voltage won't change, only the current.
    Should a cap...
  10. Replies
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    Why discount the CRT? A horizontal line...

    Why discount the CRT? A horizontal line indicates no vertical deflection, not necessarily no vertical sync.
    It makes sense to check the vertical sync of course but a voltmeter won't show what you...
  11. Thread: PET 2001 Sound

    by Hutch
    Replies
    54
    Views
    3,544

    There's a great audio circuit with a selector...

    There's a great audio circuit with a selector switch that Glen Kleinschmidt used in his 2001 clone that I keep meaning to build.
    http://www.glensstuff.com/pet2001/pet2001.htm
    57521
  12. Replies
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    1,563

    Oh, there's yellowing but it's not even all over....

    Oh, there's yellowing but it's not even all over. Also, I did so much scrubbing with a magic eraser to get it cleaned up that I removed some of the yellowing just by removing some of the surface....
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    Yep. I found the tech manual....

    Yep. I found the tech manual. http://www.bitsavers.org/pdf/dec/terminal/vt100/EK-VT100-TM-003_VT100_Technical_Manual_Jul82.pdf
  14. Replies
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    Thanks. I tried this tonight and after fiddling...

    Thanks.
    I tried this tonight and after fiddling with it for an hour I found I had a bad connector and got it working about a minute later.
    I took the baud rate all the way down to 300 just to...
  15. Replies
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    2,735

    On the subject of missing keys. The key caps on...

    On the subject of missing keys. The key caps on my VT100 keyboards seem to fall off easily. One or two will bounce right off the keyboard just from the spring rebound when typing.
    Is this common on...
  16. Replies
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    I memorized the Hayes command set 40 years ago. ...

    I memorized the Hayes command set 40 years ago. I think I still remember most of it ;)
  17. Replies
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    There are Hayes command compatible "modems" that...

    There are Hayes command compatible "modems" that will connect a dumb terminal to a Telnet session without a computer. Granted, they are a small embedded computer but this is what I'm talking about.
    ...
  18. Replies
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    OK. So forget about TTL levels. I'm mainly a...

    OK. So forget about TTL levels.
    I'm mainly a Commodore user and most of the devices I've seen are for the old 8bit Commodore machines which are all TTL level, so I just wanted to make sure I got a...
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    I'm mainly worried about not having enough...

    I'm mainly worried about not having enough signaling level to work with the VT102 if it's expecting 12v and only getting 5 and/or frying the TTL input with a 12v signal.
  20. Replies
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    As far as the TV-102 goes, Isn't the RS232-C...

    As far as the TV-102 goes, Isn't the RS232-C standard TTL? It's actually hard to find specifics on the different versions of RS232.
    I'm thinking if I get a TTL level RS232 wifi modem, it may just...
  21. Replies
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    WiFi Modem for VT-100/102?

    I recently acquired a VT-102 in good working condition. I was thinking about connecting it to a Pi running a PDP emulator but I think some level shifting is required to get RS-232 working on the Pi....
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    Very curious... A date of April '77 is far too...

    Very curious...
    A date of April '77 is far too early for that PCB. To the best of my knowledge, there were no units built by April except for the prototype. Early boards had no solder mask and...
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    I have a 2031 (not the LP version) and didn't...

    I have a 2031 (not the LP version) and didn't have much luck using ZoomFloppy with it, but to be fair I didn't spend a lot of time on it.
    Since I have a good 1541, I just use that. The 2031 is fully...
  24. Replies
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    I need a shift key and the period key from the...

    I need a shift key and the period key from the num-pad for my VT-102, if you still have any available.
    These keys seem to fall off easy and sometimes pop off just from the spring recoil. I just...
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    Do you have a close up of the stickers on the...

    Do you have a close up of the stickers on the logic board? What's the date written on the sticker just above the 0355?
    FYI, the hand written number (0355) is a production tracking number for testing...
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