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- From: john.navas@uttsbbs.uucp (John Navas)
- Newsgroups: comp.dcom.modems
- Subject: RE: GATEWAY TELEPATH MODE
- Message-ID: <8788.48.uupcb@uttsbbs.uucp>
- Date: 27 Jan 93 00:39:00 GMT
- Distribution: world
- Organization: The Transfer Station BBS, Danville, CA - 510-837-4610/837-5591
- Reply-To: john.navas@uttsbbs.uucp (John Navas)
- Lines: 38
-
- jrd@cc.usu.edu (Joe Doupnik) writes:
-
- > If you are technically curious about this area then here are some
- > hints. Kermit is very careful about testing the serial ports for
- > UART-ness and proper IRQ. It turns out that the reason many well
- > known comms programs seem to work, and not all do by any means, is
- > apparently they do not test. That is, a menu of port/irq values is
- > presented to the user and the selected numbers are used willy
- > nilly. I have not reverse engineered these programs but the
- > symptoms are as described. Add to this the need to hit some modems
- > between the eyes with a 2x4 (hard reset) and then speak to them
- > extremely s l o w l y (even typing ATDT at a slow pace on some)
- > during initialization. Imagine what the Bios does to them at boot
- > time. Some systems have a terrible time with stray interrupts so
- > Kermit's tests fail. These are all indications of, shall we say,
- > insufficient design effort and review, plus a probable attempt at
- > using a fancy slow chip to emulate an inexpensive fast UART and not
- > succeeding. Add strangness on some AT setup sequences, a pinch of
- > machine configuration difficulties, shake but do not stir. These
- > problems have shown up recently in force, so there is a common
- > factor amongst the many vendors. The basic Kermit serial port
- > operations have been successful for many many years, and still are
- > on quality modems. Thus the current crop have trouble behaving as
- > even a cheap UART.
-
- <sigh> The fact remains that most comm programs do NOT have problems
- with the "current crop" of modems. And where is it written that a
- modem be able to accept any command sequence at the maximum speed of
- the UART? "Methinks the lady doth protest too much!" <grin>
-
- Best regards,
- John
-
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