Rod, at 11:19 on Feb 13 1996, you wrote to Bill Grimsley...

BG> Normal Hayes convention has ATZ resetting ALL
BG> registers to their previously stored values,

RS> Nope, a real Hayes doesnt do that with the port speed
RS> and the absolute vast bulk of other modems dont either.

If the port speed isn't stored in NVRAM, then it can't be recalled.  Aside
from that, ATZ works exactly as it's meant to.

BG> and USR appears to follow this convention to the letter,

RS> Nope, it appears to be the exception on that ATZ behaviour
RS> with the speed the RING is sent out at when the port speed
RS> used in the ATZ command doesnt match the port speed which
RS> is stored in the NVRAM and used on a modem power cycle.

That's a load of double-dutch, but if I read it correctly, you're
suggesting that the port speed recalled by ATZ or a power-up is not the
same as that stored in NVRAM, right?  Well it does, which is Paul's main
complaint.

BG> which is why the modem won't auto-baud, but reverts to the last
BG> port setting stored with &W.  Nothing wrong with that at all.

RS> Corse there is, its completely counter intuitive, and the vast
RS> bulk of modems dont do it like that. There is a remote possibility
RS> that USR alone know of a good reason to do the port speed in such
RS> a quirky way, but if thats true it should be very unambiguously
RS> documented in the manual because its not what modems normally do.

The &B2 documentation appears to cover the reasons for that.

RS> And I think the possibility that there is actually a good
RS> reason to do it the way that USR does it is extremely remote
RS> when the vast bulk of other modems dont do it that way, and
RS> you dont see reports of problems because they dont.

I tend to think it's a carry-over of normal behaviour from the days when
the vast majority of calls were non-ARQ, and &B2 was frequently used.

BG> If one occasional extra AT command annoys you, I think you're going to be 
BG> awfully disappointed in life.

RS> Fucked designs do. Particularly when they completely fuck up a brilliant 
RS> concept on auto detection of the port speed in use like that.

I read the on-line manual again last night, and still couldn't find any
reference to ATZ's behaviour under those circumstances.  Seems to me the
real problem here is USR's failure to adequately document the difference
between their modems and everybody else's re the use of ATZ (can't comment
on other DSP modems like Digicom and AT&T though).

Regards, Bill

--- Msgedsq/2 3.20