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From: "Steven Levine" 
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@Date: Mon, 08 Dec 2003 09:16:19 -0800
Subject: Re: Contacting Ray Guinn
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In , on 12/08/03 
   at 05:43 PM, "Wilfried Kramer"
 said:

>Yes. In fact most code doesn't require knowledge about PCI. Base  address
>and IRQ sharing is enough, the rest is only for Plug & Play 
>configuration.

True, although as you say, it's handy for probing the port and irq.

>In fact, I do not know a manufacturer with PCI cards limited to 115200 
>baud. All of them run faster.

These days, it's easy.  I go back far enough to have worked with some of
the first 8051s.  Getting these to work at 38K could be a challenge. :-)

>of frequencies. The crystal may have 40 MHz to provide all of them. And 
>there are extra dividers to clock down for COM1/2. A lot of historical 
>stuff.

So true.

>We exchanged some mails at that time, but this is also more than a year 
>ago. In the documents of SIO2k, the "multiplier probing" is only named 
>at two places. I remember it was more documented in an earlier version. 
>But it may also be part of an email.

I see a section titled "Automatic Crystal Frequency." in TECHTALK.TXT. 
This seems to be related to what we are discussing.

One thing that SIO2K can do that I don't recall seeing mentioned in the
message thread is SIO2K provides a debugging tool named logger.exe.  It
collects more detail than what one can gather with the logfile= commonad
line parameter.  It may even record sufficient detail to show the
parameters that the frequency adjustment logic is attempting to use.

>Before SIO2k we had a way to use SIO 1.60d for the ISA and PCI serial 
>cards. You only need to know address and IRQ. Basically these values  are
>variable, but they only change when the configuration of the  computer is
>also changed.

True and this is easy enough to check on startup.  The biggest problem
I've had using PCI COM cards on older software is the IRQs.  A lot of the
older code allows the port and IRQ to be overridden, but limits the IRQ to
between 0 and 8.

>And second, ISA bus will be available for some years. But these are 
>special industrial computers, hence costly. It is still possible to 
>build a system based on 486 or even 386SX.

This I know.  The code I posted is running on these kinds of boxes.  A 486
is plenty fast for the application, so the boxes don't get upgraded until
they break.  I think all the PS/2 Model 30s are gone, but I haven't
spokent to this customer in a while.

>Anyone else here, applying for free hardware? :-)

Sorry. :-)

>Do you have the URL available? I'm not familiar with IBMs websites, I 
>can not find any DDK related information.

  http://www3.software.ibm.com/regsvs/ddk/>

You have to register, but registration is free.

The UART code is in inout.zip.  It's mostly assembler, but that's to be
expected given its vintage.  The code we care about at the moment is
SetBaud in atsub.asm.  Unless I missed it there's no code to adjust the
clock scaler but it would be easy enough to add.

Be aware that this code may or may not be the same as was IBM is currently
distributing as COM.SYS.  IBM can be slow to update the site.  Also, code
that a vendor might consider proprietary is not supposed to get to the
site.

Regards,

Steven

-- 
----------------------------------------------------------------------
"Steven Levine"   MR2/ICE 2.41
#10183 Warp4/FP15/14.093c_W4
www.scoug.com irc.webbnet.info irc.fyrelizard.org #scoug (Wed 7pm PST)
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