serial port on DS5000 not responding fast enough to CNTRL/S?

[Timo Lehtinen]

In article <900 at usage.csd.unsw.oz.au> mcba at newt.phys.unsw.OZ.AU (Michael C. B. Ashley) writes:
>I have a LaserJet III connected to one of the serial ports on a
>DECstation 5000. My problem is that when I send long files to the
>printer, it loses about 30 bytes every time the LaserJet's input buffer
>fills up. What I think is happening is that the LaserJet is sending a
>control/S to the DS5000 to tell it to stop sending output, and the
>DS5000 doesn't take notice of the control/s until it has sent another 30
>bytes.

Just for the record, we had exactly this same problem when printing from 
a DS2100 to a Ljet III (with Adobe PS cartridge). Hooking the printer to
a VAXstation 2000 that we had lying around solved the problem. Both machines 
run ULTRIX V4.0 - it appears to be hardware based (or device driver). I 
thought the problem was related to the infamous DS2100/DS3100 -serial port 
problems and figured that when we get our DS5000 it would be fixed... Your 
experience seems to indicate that the situation is worse than expected.

Does any know if this is a known problem with ULTRIX/RISC or the HW ?

Timo

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