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- Path: lilith.uab.es!newsmgr
- From: s_0056@blues.uab.es (Maite Auladell)
- Newsgroups: comp.dcom.modems
- Subject: Incompatibility between modem & CDROM
- Date: Mon, 26 Feb 1996 18:10:12 GMT
- Organization: Universitat Autonoma de Barcelona
- Distribution: inet
- Message-ID: <4gssjt$auh@lilith.uab.es>
- NNTP-Posting-Host: ppp-2.uab.es
- X-Newsreader: Forte Free Agent 1.0.82
-
- The short story is that my internal modem doesn't work well with the
- CD/ROM drive. Here are the details:
-
- I'm using my PC & modem to connect to a PPP account and to a Slirp
- one, and the thing went pretty sluggish, so I decided to track things
- down. Since I'm using windoze 95, I enabled the option (in contol
- panel, network) to make a log of every PPP connection, and I realized
- that there were a lot (30% or more) of CRC errors, but neither framing
- or overruns. I thought that it was strange, since the modem always
- negotiated an error corrected link, so I made a simple test: I put the
- modem in local analog loopback, sent a file with HyperTerminal and got
- it back in another file. Then I compared the two files and, oh
- surprise! Every now and then some of the characters doubled (i.e.: if
- I sent "Good morning" I got back "Good morrning"). Thinking that the
- culprit was HyperTerminal (never got it to work well), I tried with
- the Dos Comm package that came with the modem at various speeds, and
- always got the same result. I tried all the possible com settings for
- the modem (com1,2,3,4 irq3,4,5,7) and also removed the multi/io card
- that I use for the floppy controller and mouse. No luck. I thought I
- had a defective modem. But then, just to give it a try, I disconnected
- the CD/ROM drive and repeated the simple loopback test. It was ok.
- Tried it many times and always got it right. Then I went surfing for a
- while, and I got _NO_ crc errors (and a much more responsive
- connection). I reconnected the CD/ROM and the same problem arose. I
- also tryed to boot clean (i.e. not loading the CD/ROM driver) and to
- put the CD/ROM in the secondary IDE channel, with no luck. Now, if I
- want to use my modem, I have to diconnect the CD/ROM.
- The ingredients:
-
- - A no name Rockwell glue'n'go V34 internal fax/modem (now setup as
- COM3-IRQ7, but I tried all the other configurations)
-
- - A multi/io card with COM1(IRQ4), COM2(IRQ3), LPT1, FLOPPY, GAME and
- HD Controller (the HD controller is disabled)
-
- - An ATAPI MITSUMI FX400 quad speed CD/ROM Drive, now connected to the
- secondary IDE Channel of the MotherBoard.
-
- - A no name 486 motherboard with VESA/ISA/PCI Slots, integrated dual
- IDE/PCI controller, AMD 486 DX4/100 CPU, 8Mb RAM and (as I just
- discovered) fake cache memory. The Bios is an AMI with date 07/25/94.
-
- - A Trident SuperVga PCI Card (TGUI9440) with 1Mb RAM, Bios version
- A5.2 (67)
-
- - A Maxtor 7540AV Hard Disk (540Mb in Maxtor docs, but they really are
- 504)
-
- I'd like to leave the CD/ROMA always connected (mostly because it's an
- internal model) so if is there someone out there who knows a solution
- out of changing the modem/CD-ROM, please tell me. (I'll ask the dealer
- to change the motherboard anyway, for the fake cache, but I'm not sure
- he will do that since I bought it 10 months ago).
- Please mail-me as well as posting here, 'cause I do monitor this
- group, but my server seems to be loosing a lot of messages (or gets
- them very late).
-
- Many thanks
-
- Maite Auladell
-
-