Re: External Modem Emulator
Hi This sounds like a fun project. I like electronics.
I'm wanting to build a little electronic circuit that will
automatically reboot my computer on every blue screen.
Sometimes, hackers attack my computer when running my
irc bots and I wake up the next morning to see that my computer
crashed. So I thought, why not put a phototrasistor on a certain
part of my monitor and whenever my computer crashes, the transistor
recognizes the color and triggers my reset button on my computer.
Well, I have'nt built it yet, but, I will sometime. :)
NOTE: I was wondering about your linux. I think that 14.4
modems can use lots of different drivers. Linux might have a
generic driver for 14.4 that will work. ...timmy
Ben Logan wrote:
> Thanks, Bernie, and Jeff. I was able to get the com ports working.
>
> Here's what I'm trying to accomplish:
>
> I have two computers on the same desk; a P166 with a controller-less modem
> (winmodem--BLEHCK), and a 486 with a 14.4k modem. I've recently installed
> Linux (Redhat 5.2) on the P166, and it won't work with the winmodem. (I'm
> still running Windows on the P166, I'm just playing around with Linux.)
>
> So...I was thinking...what if I could redirect the input and output on the
> 486 so that anything coming in thru COM1 is sent out COM2, and anything
> coming in thru COM2 is sent out COM1. Now, assuming that the modem in the
> 486 is on COM2, if I connect the two computers via a serial cable (COM1 on
> 486 to COM1 on P166) then the P166 will be fooled into thinking that it's
> got an external modem. (I'm speculating, not stating fact.)
>
> So far, it seems to be working. I can control the 486's modem from the P166
> in Windows or Linux. Some things don't seem to work properly, but I think
> it's probably because it's so slow. One thing I don't understand is that it
> will only work if I set flow control to software...it won't work on
> hardware.
>
> Now that I've explained what I'm trying to do, I was wondering if anyone can
> tell me how to make it work better--or tell me that there's no chance of
> getting it to work properly. I've included the program I wrote. It runs on
> the 486.
>
> -------------------MEMU.EX-----------------------
> --Modem emulator...fools computer on other end of serial cable, into
> thinking
> --it owns an external modem.
>
> --Anything that comes in com2 is sent out com1, and anything that comes in
> --com1 is sent out com2.
> --Some concepts are taken from E-TERM.EX--Thanks to PJB Systems
> --Pressing any key breaks out of the program.
>
> without type_check
>
> include serial.e
>
> integer key,data,rcnt
> sequence rBuffer rBuffer = {}
>
> clear_screen()
> puts(1,"Modem Emulator in operation...press a key to terminate...")
>
> SetPortBPDS(1,19200,0,8,1) --Configure the ports
> SetPortBPDS(2,19200,0,8,1)
>
> rcnt = 0
> key = -1
> while key < 0 do
> data = GetSerialByte(2) --See if modem has sent any data
> if data > 0 then
> rBuffer &= data --Yes, so put it in buffer
> rcnt = 200 --This must be 200 in order not to lose data
> else
> rcnt = rcnt -1
> end if
> if rcnt < 1 then
> rcnt = 0
> key = get_key() --If user has pressed a key, then exit prog
> if length(rBuffer) > 0 then --If there's anything in buffer,
> for i = 1 to length(rBuffer) do --Send it out
> SendSerialByte(1,rBuffer[i]) --com1
> end for
> rBuffer = {} --Empty the buffer
> end if
> data = GetSerialByte(1) --Get data from com1 (remote 'puter)
> if data > 0 then --If any data was waiting,
> SendSerialByte(2,data) --send it to modem
> end if
> end if
> end while
> puts(1,"\n\nDone.\n")
> -------------------------------------------------
>
> Thanks in advance,
>
> Ben
>
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