Re: Transfer time with ADTgs - 2.5 *HOURS*?

[pausch@saaf.se (Paul Schlyter)]

In article <XaB%7.9884$JF.84589@rwcrnsc52.ops.asp.att.net>,
Mad Martian <news@madmartian.com> wrote:
 
> It is taking me 2.5 *hours* per 140k .dsk file from a PC. This seems rather
> excessive. I used the pinouts listed in the transfer faq to build a
> combination 2gs high speed modem cable/null modem adapter in one cable (faq
> #20, end of question 6 answers, using dsub9f on the PC end).
> 
> Now doing the math, assuming 1 bit per baud at 9600 baud, 9600 bits per
> second at 8 data bits + 1 stop bit per byte means 1066 bytes per second.
> 140k bytes = 143,360 bytes should transfer in about 2.2 *minutes*. Adding
> time for software overhead (error checking) and file saving shouldn't add
> 2.3 *hours*. Is my math or my cable flawed? The disks do work and no errors
> are reported during transfer on either end.
> 
> Here's the pinouts I used from the faq:
> 
> IIgs       PC      Signal
> -----------------------------
> 3           2         RXD
> 5           3         TXD
> 4,8        5         GND
> 2           7         RTS
> 1           1,6,8   CTS, DSR, DCD
> 7           4         DTR
> 
> Thanks.
 
It's obviously not the cable, since otherwise you wouldn't get any
data transferred at all.  I've been running ADT (not ADTgs though,
but the standard ADT) with a simple 3-wire cable (RxD, TxD, GND) and
it worked fine, at a speed which could be expected.
 
Perhaps you could try to examine the serial port lines using a
"break box", to see which lines are "live" and which aren't, which
one changes and how often, etc.
 
-- 
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