IBM BSC CRC?
ethan.dicks at gmail.com
Mon Jan 27 13:36:51 CST 2020
On Sun, Jan 26, 2020 at 2:59 PM Mattis Lind via cctalk
<cctalk at classiccmp.org> wrote:
> Hello IBM BSC Experts!
I used to be one 25 years ago, but it's been that long since I've even
set up a BSC line.
> I am trying to figure out the CRC algorithm used by IBM BSC...
> From this document (
> I get that the CRC calculation is reset on SOH (01h) or STX (02h) and
> accumulates until and including the ETX (03h). (excluding any SYN (32h)
That's a good document.
What we used as our "gold standard" in the 80s was a "Data 100" manual
for a 3rd party BSC workstation. The documentation went way beyond
CRC-16 and message formats. It delved deeply into the whole protocol.
I don't remember the vendor, and I know I don't have a scan of it. I
was not able to quickly find a copy online but I admit I didn't search
more than a few minutes. It would be a good resource to locate.
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