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  • Re: IBM 3270 coaxial type A protocol controller chip

    From Louis Ohland@21:1/5 to Louis Ohland on Fri Nov 19 10:06:58 2021
    Uh, the original 3270 used a 93 ohm, RG-62 coax [close fit to ECL].
    Later versions could use the 150 ohm [ICS?] as well.

    I think...

    On 11/19/2021 09:57, Louis Ohland wrote:
    So. I'm not findting a mountain of documentation, here. What is the difference between the "A" and "B" Coax controller chips?

    Does this have anything to do with the 3270 /A and 3270 /B versions? Is
    Elvis still alive? Was Joe Biden the man on the grassy knoll?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to Louis Ohland on Fri Nov 19 10:08:19 2021
    https://www.rs-online.com/designspark/a-fresh-look-at-ibm-3270-information-display-system

    The physical interface of choice for a regular terminal is RS-232 and
    the standard specifies 15m as the maximum cable length, with a typical
    speed of 9,600 bits/second. Whereas a 3270 terminal has a 93 ohm coax connection and can be located up to 3 kilometres from its controller,
    with a data link that operates at 2.3587 Mb/s.

    On 11/19/2021 10:06, Louis Ohland wrote:
    Uh, the original 3270 used a 93 ohm, RG-62 coax [close fit to ECL].
    Later versions could use the 150 ohm [ICS?] as well.

    I think...

    On 11/19/2021 09:57, Louis Ohland wrote:
    So. I'm not findting a mountain of documentation, here. What is the
    difference between the "A" and "B" Coax controller chips?

    Does this have anything to do with the 3270 /A and 3270 /B versions?
    Is Elvis still alive? Was Joe Biden the man on the grassy knoll?


    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Fri Nov 19 09:57:50 2021
    So. I'm not findting a mountain of documentation, here. What is the
    difference between the "A" and "B" Coax controller chips?

    Does this have anything to do with the 3270 /A and 3270 /B versions? Is
    Elvis still alive? Was Joe Biden the man on the grassy knoll?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)