-=> Quoting Rod Speed to Dieter Mirbach <=-

 DM> If it were a flow control problem, surely it would show on any
 DM> transfer protocol, not just Zmodem.

 RS> No, a small block, non windowed protocol doesnt need flow control. For
 RS> example with Xmodem, the sending comms prog sends a block, small one
 RS> too, and waits for an ACK form the receiver. The block is so small
 RS> that it cant overflow the buffer in the modem, so if flow control isnt
 RS> working you wont notice since flow control wont be used anyway.

Good point, didn't think of that. I knew that Zmodem went flat tack, and 
only signaled if there was something wrong with the packet, but was 
unaware that it could be upto 8 packets in front before the sending 
modem corrected any errors. Hence that may expalain that the entire 
REP Packet is sent in its entirety at first (say 6k), and then the 
response from the upload window is "Retrying from 1024", and then the 
CRC erros mount up.

Anyway, I heard that someone else has the problem, I saw it on one of 
the modem suppport echos. 
 
 DM> It looks as if I will have to get serious with this & devote some
 DM> time to sorting it out.

 RS> Yeah, looks like it. Wouldnt be the first time that its something
 RS> caused by a bizarre combination of things.

Well that will be two modem problems in as many months, the other being 
this MaestroSpirit thing.

Dieter



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