[PLUG] How to set base I/O on old modem?
Marvin J. Kosmal
lamsokvr at xprt.net
Thu Jan 2 18:03:02 UTC 2003
On Thu, 2003-01-02 at 17:51, Marvin J. Kosmal wrote:
> On Thu, 2003-01-02 at 17:13, Tyler F. Creelan wrote:
> > Hi everyone -
> >
> > I've got a non-pnp ISA modem and I can't figure out how to set the base
> > I/O address on it. Below is a schematic of the jumpers on the card and
> > their labels. It would appear the numbers in the ON column refer to
> > jumpers that need to be set, which is straightforward, however it's not
> > clear to me what this cryptic "COM" thing refers to; since the I/O address
> > isn't referenced anywhere on the card, perhaps COM refers to it in some
> > way? Any ideas?
> >
> > Schematic of the modem, where '.' is a pin and [ ] is a jumper:
> >
> > JMP4
> >
> > . [. .]
> >
> >
> > JMP8
> >
> > 6 . .
> > 5 . .
> > 4 [. .]
> > 3 . .
> > 2 . [. .]
> > 1 . [. .]
> >
> >
> > There is also a table of this form, it is not situated near the jumpers:
> >
> > COM IRQ ON
> > 1 4 1,2,5
> > 2 3 2,4
> > 3 4 1,5
> > 3 5 1,6
> > 4 3 4
> > 4 2 3
> >
> >
> > For reference, the modem is a Cirrus Logic 1414 ECT. The microprocessor,
> > SAFE device, and DSP are "CL-MD1214-11QC-D", "CL-MD1724-11VC-D", and
> > "CL-MD2614-20QC-E" respectively, and there are: "WS-1414IV1 NO:F1-0001" at
> > the slot side of the card, and "HT IV-0 9511" at the top. According to
> > this reference the card will work as a modem device under linux when
> > configured with setserial:
> >
> > http://www.idir.net/~gromitkc/intel/cirrus_cl-md1414ecx.html
> >
> > I'm using this Modem Howto as a guide:
> >
> > http://en.tldp.org/HOWTO/Modem-HOWTO.html
> >
> > The device is not a winmodem. FYI, there appears to be a program "scanport"
> > shipped with Debian to probe ISA devices but it's segfaulting and I'll
> > have to try reinstalling it. The reason I want to know the base I/O is I
> > want to setup the modem as a serial device under linux, using setserial,
> > so I can access the internet.
> >
> > Thanks!
> >
> > Tyler
> >
>
>
>
>
> comm refers to your serial communications port...
>
> Of which you have two
>
> comm 1&3 are the same
> comm 2&4 are the same
Correction:
Usually comm1 & comm3 use irq4
and
comm 2 & comm4 use irq3
And yes comm1 and comm3 have different addresses.
There are only 2 UART's on the motherboard -- or one
if you have a cheap motherboard...
So if you really need two comm ports.
The usual configuration is one even and one odd..
You can usually -- manually -- change the address in BIOS.
HTH
Marvin
>
> do a cat on /proc/ioports and you should get something like
> this :::
>
> 0000-001f : dma1
> 0020-003f : pic1
> 0040-005f : timer
> 0060-006f : keyboard
> 0070-007f : rtc
> 0080-008f : dma page reg
> 00a0-00bf : pic2
> 00c0-00df : dma2
> 00f0-00ff : fpu
> 01f0-01f7 : ide0
> 02f8-02ff : serial(set)
> 0378-037a : parport0
> 037b-037f : parport0
> 03c0-03df : vga+
> 03f6-03f6 : ide0
> 03f8-03ff : serial(set)
> 0cf8-0cff : PCI conf1
> 4000-40ff : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
> 5000-500f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
> 6000-607f : VIA Technologies, Inc. VT82C686 [Apollo Super ACPI]
> c000-c00f : VIA Technologies, Inc. Bus Master IDE
> c000-c007 : ide0
> c008-c00f : ide1
> :
>
>
> Notice address 03f8 - 03ff an eight bit port..
>
> Comm 1 or comm 3
>
> now cat interrupts
> CPU0
> 0: 1007032 XT-PIC timer
> 1: 6061 XT-PIC keyboard
> 2: 0 XT-PIC cascade
> 4: 1531380 XT-PIC serial
> 8: 3 XT-PIC rtc
> 9: 0 XT-PIC es1371
> 10: 91 XT-PIC usb-uhci, usb-uhci
> 11: 48888 XT-PIC ide2, ide3
> 12: 273792 XT-PIC PS/2 Mouse
> 14: 11 XT-PIC ide0
> NMI: 0
>
> You will notice irq4 is serial or comm1
>
> Which is ttyS0 in linux
>
> HTH
>
>
> Marvin
>
>
>
>
>
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