[CQ-Contest] Expanding Comm Ports

[Jeffrey Maass]

On Sat, 3 Jan 1998, Barry Kutner wrote:

> On  3 Jan 98, Michael A. McCarthy <w1nr at eecorp.com> wrote:
> 
> 
> >    Again, you don't need 650's for anything less than 115K bps...
> > 
> > 73,
> > Mike W1NR
> > -- 
> My experience says otherwise. I have an old PC that was originally a 
> 386/25, which I replaced the motherboard to make it a 486/80. It 
> still has the original serial board with 8450 UARTs. It won't run 
> reliably unless the speed between the puter and modem is 14.4 or 
> less. No, it's not my phone lines, as it runs fine at 33.6 on my 
> Pentium with 16550s.

I don't see that you are saying anything contrary: just different. He said
the '550 chips are all you need. You're saying the '50 chips aren't
enough, and that the '550 chips work fine. 

> 
> On a related note, I read in a recent PC Magazine that some of the 
> new Pentium II systems have NO available IRQs as delivered from the 
> factory. So you won't be able to add axtra COM ports, etc. Check 

My Pentium II system is in that class: not even one spare interrupt.

Has anyone seen a sloution (add on multi-RS232 interface) using the Universal
Serial Bus (USB) port? 


Jeff Maass       (jmaass at freenet.columbus.oh.us)      Amateur Radio K8ND
      USPSA/IPSC # L-1192   NROI/CRO          NW of Columbus Ohio
      25000 Members in 2000!




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