On 2021-03-02, at 17:48:48, Jim Elliott wrote:
>
> There was a product called the Yale IUP and later product version the 7171
> Device Attachment Control Unit which "converted" ASCII displays (like the
> IBM 3101) into 3270 protocol devices.
>
> Later there was the 3174 Controller
> with the Asynchronous Emulator Adapter (AEA) which is what I think you are
> referring to, and it also emulated 3278 on ASCII.
>
It went both ways. According to:
http://bitsavers.trailing-edge.com/pdf/ibm/3174/ZZ25-8524-0_3174_Asynchronous_Emulation_Adapter_Feature_Nov87.pdf
IBM Internal Use Only
Introduction
Terminology
The 3174 Asynchronous Emulation Adapter (ABA) feature and Release 3 micro- code
provide the customer with increased connectivity by allowing the customer to:
• Use an ASCII device to communicate with an ASCII host
• Use an ASCII device to communicate with an IBM host
• Use a 3270 device to communicate with an ASCII host
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
• Use a 3270 CUT device in MLT (Multiple Logical Terminal) mode to have
multiple sessions with ASCII and IBM hosts.
I once tried the configuration I highlighted. Not very useful
to me since I had a real ASCII device on my desk. But the
emulation was surprisingly faithful.
-- gil
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