On 2021-03-02, at 11:18:25, Fred Shaheen wrote: > > > The ASCII controller was the 7171, developed by Dr. Wehrle's team in the > Glendale Lab in the 1980's. > I believe that was a successor and embedded the "Yale ASCII" which was based on an IBM Series 1 minicomputer. Those provided the hardware base for IND$FILE and Columbia Kermit, which switched modes with a valid but improbable sequence of 3278 control bytes.
I believe the 3174 AEA was different. But it may have embedded 7171 firmware. > My car pool buddy at the time, Tom Murphy Jr. (the other Tom Murphy for > those of you in VM) was the lead > developer on that box. > From: Paul Gilmartin > Date: 03/02/2021 12:07 PM > > On 2021-03-02, at 09:38:54, Dave Jones wrote: >> >> I wonder how hard it would be for z/VM to emulate, or virtualize, a >> VT220 type terminal? >> > In days of yore, there was a hardware solution. The 3174(?) > Asynchronous Emulation Adapter. I don't remember the configuration > I tried, but it made an (independent vendor) 3278 behave remarkably > like a VT-220. -- gil ---------------------------------------------------------------------- For LINUX-390 subscribe / signoff / archive access instructions, send email to lists...@vm.marist.edu with the message: INFO LINUX-390 or visit http://www2.marist.edu/htbin/wlvindex?LINUX-390
