3270 controller simulation

Dave Wade dave.g4ugm at gmail.com
Mon Nov 18 14:37:22 CST 2019


One thing which complicates things is that we have (roughly) layered protocols in place between the 3174 and the host. 
So at the physical level we have channel attached, SDLC, Token Ring and bi-sync.
Above that we have the channel protocols, HDLC/SDLC and bi-sync polling.
Then we may have SNA (which encompasses many options) to transport the data through the network.
At the top the protocols and frame formats in the Data Streams manual which are broadly the same but with tweaks for SNA, Local and Bi-Sync.


> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Al Kossow via
> cctalk
> Sent: 18 November 2019 17:32
> To: cctalk at classiccmp.org
> Subject: Re: 3270 controller simulation
> On 11/18/19 9:16 AM, Grant Taylor via cctalk wrote:
> > Would you please clarify if you have the "Local" or "Remote" 3174?
> All of my terminal controllers are remote, since I don't have anything with a
> channel.
> I have a small S36 in storage which is why I have some interest in twinax. I
> guess I'd have more if anyone ever gets S34 or 36 running in simulation.
> I have started collecting ISA/PCI/Nubus cards and software for twinax to go
> along with what I've been doing for coax. They are pretty cheap and available
> right now (at least the HW, software is harder) with the exception of the Nubus
> Coax/Twinax board which is unobtanium.

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