Illegal Operations

[Malcolm Robb, LC 0112G]

If by 'crash' you mean that they stopped receiving and displaying data (as 
opposed to the software locking up), then I have a similar problem on my 
IBM Thinkpad (can't remember the number, but it is an old steam powered 
'486 model). I wrote some simple 16 bit QuickWin code of my own to try and 
reduce the startup time, increase the sample rate and reduce the memory 
requirement (the notebook only had 12Mb, and Carbytes took forever to 
start, and would only manage 1 sample a second). I was quite surprised when 
my software also suffered the same fault.

What happened was that if/when a PC running Windows recieves an error on 
the COM port (for example a, framing error), it freezes the comport until 
you clear the error. This means that the PC can still transmit '232 data, 
but it will never receive anything. The only way to restore comms is for 
the host program to call GetCommError() (or the equivalent 32 bit 
function), and after that, everything is hunkey-dorey again (until the next 
error). The errors occur on my car during cranking, and under very heavy 
load (100% throttle 5000+ RPM, 1.5+bar turbo boost, 10mS + injector 
duration)

I haven't had time to investigate further with Carbytes or Freescan to see 
what their error recovery strategy is, but it is possibly the same fault. 
If so, then you will need to wait for Paul and/or Andy to sort it out, or 
download the source code and sort it out yourself. I was meaning to 
ask/tell both Andy and Paul about my observations, but never quite got 
around to it. Sorry guys.

Cheers,
Malcolm Robb, LC 0112G

-----Original Message-----
From:	Shawn R. Lin [SMTP:slin01 at mail.orion.org]
Sent:	Tuesday, April 25, 2000 6:42 AM
To:	gmecm at diy-efi.org
Subject:	Illegal Operations

Finally fully assembled my MAX232-based ALDL scanner.
Works great, but I'm having trouble on the PC-end.
I've tried both Andy Whittaker's FreeScan and Paul Blackmore's CarBytes
v2.
After a few minutes of reading the normal ECM chatter, both programs
will crash with an "Illegal Operation".
I'm using Com3 and Win98 on an IBM Thinkpad 560.  Com2 is my PCMCIA
modem, Com1 is the IrDA.

Anyone seen this before?
At first I thought it was the software, but since both programs crash,
I'm starting to think something's wrong with my PC.
Both programs work fine when I'm not accessing the serial port.  Maybe
it's my funky Thinkpad.

Shawn
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