#DSB/ASDG
First of all, I would like to point out that my original message was not
intended as a critique of the DSB. The DSB seems to be well manufactured and
works as advertised. Now to answer your questions:
I always use Z-Modem for downloading to either RAD (FFS) or Ram.
The speeds I achieve on the Amiga serial port, with no HD partitions mounted,
can be in excess of 1650 cps, with NO errors. The equivalent transfer with the
DSB comes in at less than 1450 cps.
A fully loaded system gives me transfer speeds of less than 1550 on the Amiga
serial port, usually with errors of course. The equivalent DSB rates are
approximately 1300 cps. Errors should not factor into the Amiga serial
calculations, as JRComm uses actual data transferred in its calculations. I
have also verified these numbers on the host system.
I also thought the CTS/RTS handshaking was causing a major delay, as the RTS
line drops frequently during transfers with the DSB, so I lowered the DTE rate
to 19,200. This reduced the RTS delays marginally and it also caused a minor
drop in transfer speeds.
I don't quite have six HD partitions, only three FFS partitions plus my
autoboot partition. Jack Radigan claims that other people using the 2090a are
having similar problems with high speed transfers. I'll be switching to a
HardFrame when it gets back from the shop.
Please note that the above transfer speeds quoted for the Amiga serial port
under "loaded conditions" are highly variable, depending on the error count and
the phase of the moon. However, I can always achieve better transfer speeds
through the Amiga serial port running a "dead system".
WCM