[HECnet] DDCMP over asynchronous emulated lines on simh 4.0

[Johnny Billquist]

On 2013-05-02 18:01, Paul_Koning at Dell.com wrote:

On May 1, 2013, at 10:32 PM, Johnny Billquist wrote:

On 2013-05-01 23:18, Clem Cole wrote:
...The Able DH's
actually could run at faster speeds than the DEC one did.

Are you sure about Able? I can't remember seeing any such thing from them. Emulex did that, though. SC02 and various incarnations. It didn't have full modem control, but enough for the common use.
Speed was better than a real DH-11 for sure, as well as just taking one slot.

How can speed be better?   DH-11s had no trouble running all 16 lines at line rate -- RSTS did that routinely.   In fact, RSTS systems were used at DEC as system test controllers for that reason (with a number of DH-11 controllers, or possibly DHU-11 later on, controlling the consoles of numerous systems under test).

Bad phrasing on my part.
DH-11 runs the lines at a maximum of 9600 bps. The Emulex card could also run them at 19200 bps, using the speed code called Ext.A on the DH-11.

	Johnny