Date: Wed, 05 Jul 2000 00:08:7: -600
From: [EMAIL PROTECTED]
Subject: Re: Timeout Expired
On 2000-07-04 [EMAIL PROTECTED] said:
>That's possible, but if the Courier is a 9600 modem, and not a 14.4
>modem, then it should work just as well as the Zoom, and even the
>Zoom requires that the port be "locked" at 38400 to operate at its
>full potential (using V.42bis data compression).
This Courier has all of its commands printed underneath it, and there
it indicates it can be set to &N6, which is 14.4.
Thanks for the additional strings to examine with the ZOOM.
>don't have a 16550 UART on that port, you can't do that without
>having some dropped characters or bytes as you go. The question is
>whether you want "authenticity" or a working computer. The fact is
>that with Net-Tamer, you can really use the higher speed, but to
>get it you'll need a serial port card with a 16550 UART, _or_
>you'll need an _internal_ modem rather than external.
True, but I'd prefer to say I'd like the "best working authenticity".
A 16450 UART, which happens to be the serial card that I found with
this system, is probably closer to what was suitable around 1986 (or
a few years later) for this PC/XT -- actually a PC/XT-2, which was
the second (and final) model that IBM produced in the XT line and had
a 256k-640k motherboard. It is certainly a fine "working" computer,
whether or not it has a 16450 or 16550 UART card -- what's better or
not all depends on the need of the user. What's more, I'd don't like
getting rid of reasonably functioning components, if they're serving
their purpose reasonably well. 9600 bps is suitable and satisfactory
for this machine, and the Courier was designed to be flexible enough
to service this machine and its available UART at the V.32 standard
with a respectable, reliable speed. Of course, I said earlier that it
seemed a shame to use this Courier that was designed to go up to 14.4
kbps to run at only 9600 bps -- but when I finally got it running, I
decided that I liked some of it features better than the ZOOM that
runs at the same speed. And it's interesting to have one of these
USR Courier HST modems that support the "dual standard". They were
the top of the line in their day.
>I used internal modems with an old AT&T PC6300 partly because the
>built-in motherboard serial port wouldn't handle anything above 9600
>very well (it worked okay with an Anchor Volksmodem 12 external
>1200 bps modem for a while). Like your XT, the AT&T had an 8250
>UART on that serial port. There wasn't any way to easily remove
>the 8250, either, as it was permanently mounted, rather than
>socketed.
My version of WordStar 3.30p was the bundled software customized
for the AT&T PC 6300. :) Was this machine like the early model
PC/XT?
>Many people who had XT computers chose to use internal
>modems because they save space and a power outlet, and, as
>high-speed modems came along, they provide their own UART (either
>real or emulated). An internal modem which either has or emulates
>a 16550 UART should allow an 4.77 MHz XT to easily support 38400 or
>even 57600 for the port assigned to that modem.
Although the speed of the modem could be increased with such an upgrade,
it won't improve the parsing speed of Net-Tamer at 4.77 MHz. Even at
9600 bps, the time to load an html page is far smaller than the parsing
time of Net-Tamer -- so faster modem speed wouldn't make a great deal
of difference, in my view, after a certain point. What would need to
be improved is the parsing speed for html processing. And when it
comes to large downloads... well, I won't use anything less than one
of my Pentium systems and a V.90 modem and a hard drive much larger
than the 20 MBs on this XT... ;-)
Jerry >>>> USR Courier HST/V.32 9600 | PC/XT & PC Color Display <<<<
>>>>> PC DOS 3.3 & WordStar 3.30p | 20 MB HDD & 360K FDD <<<<<
Net-Tamer V 1.11.2X - Registered
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