3270 controller simulation

[Dave Wade]

> -----Original Message-----
> From: cctalk <cctalk-bounces at classiccmp.org> On Behalf Of Grant Taylor via
> cctalk
> Sent: 18 November 2019 17:07
> To: cctalk at classiccmp.org
> Subject: Re: 3270 controller simulation
> 
> On 11/18/19 9:42 AM, Dave Wade via cctalk wrote:
> > Yes the second. So it only works with SNA .
> 
> ACK
> 
> I don't think DLSw being SNA only is a problem.  I say this because I think DLSw
> requires TCP/IP connectivity.  Thus you already have TCP/IP connectivity to the
> mainframe.
> 

The free VM370 does not support SNA so for that you would need to convert from SNA 3270 back to channel attached protocol...
... I suppose on reflection that’s do-able..


> > Yes its DLSw. Was demonstrated at the recent DEC Legacy event..
> 
> ACK
> 
> [3270]---(coax)---[3174]===(SDLC)===[Cisco]---(Ethernet)---[Hercules]
> [3270]---(3720)---[3174]===(????)===[Cisco]---(DLSw/IP)----[Hercules]
> 
> Is it proper to say that SNA is the protocol that is carried across the DLSw over
> IP?  Is it also what's carried over the SDLC?
> 
> > No, I was thinking if you had an older  mid-range box with no TCPIP...
> 
> Okay....  I'm lost.

If you needed to get screens into a System/36 which has an SDLC port but no ethernet.

> 
> If there's no Cisco box with Twinax and the host doesn't have TCP/IP, how are
> you going to connect things?
> 
> SNA across Token Ring and / or Ethernet?
> 
> #confused
> 

Real SDLC from the CISCO

> > This is where I miss the old IBM offerings cataloge
> 
> pr0n   :-)

Well mine seems to have banished. I wonder if my wife hid it on purpose.

> --
> Grant. . . .
> unix || die

Dave