Image Map Image Map
Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Should I buy this?

  1. #1
    Join Date
    Mar 2017
    Location
    Niagara Falls, Canada Eh?
    Posts
    600

    Default Should I buy this?

    I need to attach a serial null-modem cable to my modern machine, but of course, it has no serial port.

    I am in need of an adaptor, and an adaptor which will handle a null-modem cable fine, because the one I ordered a month ago, doesn't as I keep getting timeout errors.

    I found this one.

    Would it work?

    http://www.ebay.ca/itm/USB-2-0-to-Se...4AAOSwWmhZkzpw

  2. #2
    Join Date
    Jan 2010
    Location
    New Zealand
    Posts
    4,101
    Blog Entries
    4

    Default

    Yes it should. What speed are you running your current on at?
    Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

  3. #3
    Join Date
    Mar 2017
    Location
    Niagara Falls, Canada Eh?
    Posts
    600

    Default

    Quote Originally Posted by Caluser2000 View Post
    Yes it should. What speed are you running your current on at?
    11152 or whatever it is.

  4. #4
    Join Date
    May 2006
    Location
    Hamilton, Ontario, Canada
    Posts
    3,791

    Default

    Funny that this should come up.

    I have a client that I sold a TRS-80 Model IV to and he was asking me if there was any way to connect it to a modern printer.

    With the addition of an appropriate 25 to 9 pin down-size adapter, would this work?

    Of course, he'd have to route the LPT output to the serial output, but, with LSDOS, that's pretty simple.
    Legacy Computers and Parts

    Sales of, parts for, and repairs to, Vintage and Legacy computers.

  5. #5
    Join Date
    Mar 2017
    Location
    Niagara Falls, Canada Eh?
    Posts
    600

    Default

    Quote Originally Posted by Druid6900 View Post
    Funny that this should come up.

    I have a client that I sold a TRS-80 Model IV to and he was asking me if there was any way to connect it to a modern printer.

    With the addition of an appropriate 25 to 9 pin down-size adapter, would this work?

    Of course, he'd have to route the LPT output to the serial output, but, with LSDOS, that's pretty simple.
    I would assume it would, my question is whether it'd work properly for thing like file transfers, or SLIP, stuff which requires a null-modem cable.

    For other things, I don't see what the problem would be.

  6. #6
    Join Date
    May 2009
    Location
    Connecticut
    Posts
    4,621
    Blog Entries
    1

    Default

    Quote Originally Posted by ScanDisk View Post
    I would assume it would, my question is whether it'd work properly for thing like file transfers, or SLIP, stuff which requires a null-modem cable.

    For other things, I don't see what the problem would be.
    Don't know about that specific adapter but http://www.jamesfmackenzie.com/2016/...from-pc-to-st/ is an example of how file transfers can work over a USB to serial connection. The Atari ST isn't that different from a typical PC in regards the serial port. The tricky thing is that there are so many serial port transfer programs that setting the best options of both computers can take awhile.

    I believe one can't go the other way and use a serial port to connect with a USB printer. The printer lacks the drivers necessary to handle serial port protocols.

  7. #7

    Default

    "Support Bits per second Data transfer rates from 300 baud to 921600baud (RS232 ) at TTL levels"

    This probably means that adapter's transmitter outputs 0/+5V, instead of RS232's standard -12/+12V.
    Not good. Some receivers tolerate that, some don't.

  8. #8

    Default

    http://www.ftdichip.com/Products/Cables/USBRS232.htm
    These explicitly mention "RS232 level converter" or "RS232 level shifter".

  9. #9
    Join Date
    Jan 2010
    Location
    New Zealand
    Posts
    4,101
    Blog Entries
    4

    Default

    Quote Originally Posted by ScanDisk View Post
    11152 or whatever it is.
    That'll be your problem then. You need to set it up much slower to match the old system.
    Last edited by Caluser2000; August 22nd, 2017 at 02:54 PM.
    Thomas Byers (DRI)- "You'll have a million people using the A> [MS-DOS prompt] forever. You'll have five million using [nongraphic] menu systems such as Topview, Concurrent PC-DOS, Desq, and those types. But there'll be 50 to 100 million using the iconic-based interfaces."

  10. #10
    Join Date
    Feb 2012
    Location
    New Zealand
    Posts
    2,656
    Blog Entries
    2

    Default

    Also USB doesn't exactly have hardware interrupts, so it's not great in situations where flow control is required (e.g. file transfers to old PCs).

    From memory, FastLynx 3 managed to work around this, but most older programs would just bail out on a regular basis - even at low baud rates like 9600. I really just put USB<->Serial in my "waste of time" basket for anything other than monitoring an Arduino and stick to using a low cost Win98 era machine for computer serial stuff.

    Just my two cents.

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •