#DSB/ASDG
I recently purchased a USRobotics HST 14.4k modem. I immediately began
experiencing transfer errors while trying to download at 14.4k. I tried all the
usual remedies, a one bit plane screen, no heavy multi-tasking, CTS/RTS flow
control and a multitude of term programs. These all helped to varying degrees,
but the errors persisted.
I proceded to do some extensive testing, first eliminating the modem as the
source of the problem, then the phone line and finally RF interference. This
left me with my Hardware(2000, 2090a,2052) or software as the cause of my
transfer errors. I finally discovered that unmounting all my HD partitions,
except the autoboot partion, eliminated the errors. Needless to say this left
me with a somewhat lifeless system and what I felt was a unacceptable
soloution.
After reading a review of the DSB from ASDG, I thought it was the answer to my
problems. I purchased the DSB and installed it with little difficulty. The DSB
did eliminate my transfer errors, but I also lost 200 – 300 cps in transfer
speed. I found this somewhat puzzling, as the DSB allowed me to use a DTE rate
of 38400, as opposed to 19200 with the Amiga serial port.
I did some more tesing and I discovered that the level of system activity had
little effect on the transfer speeds achieved by the DSB, which is encouraging.
I also spoke to Perry K. of ASDG who had a few suggestions, but these had
little effect. I would like to have changed the size of my serial buffer, but
JRComm is currently hardwired for 8K. It seems that the DSB adds an extra layer
of overhead to the transfer process, although I'm not sure why.
I would like some feedback from anyone who is using a similar setup, please
send me your suggestions or comments.
WCM