Honeywall mainframe CPU front panel ID?

Charles Anthony charles.unix.pro at gmail.com
Thu Jul 27 09:07:00 CDT 2017

On Thu, Jul 27, 2017 at 6:33 AM, Noel Chiappa via cctalk <
cctalk at classiccmp.org> wrote:

> I wish I knew why there were two different kinds of IOM panel, but I'd
> only be guessing - I haven't seen anything in the manuals so far.
I know that the IOMs evolved; starting with the GE era GIOC (Generalized
I/O Controller), IOM, IMU (Information Multiplexor Unit), and the NSA (New
System Architecture).

I have seen references to IOM 6000 and IOM 6000A model numbers.

The NSA units duplicated the page table lookup hardware, allow process
generated channel programs to do I/O in the process memory space.

If one of the IOM panels has any reference to paging, then it would be from
the NSA series.

The SCU memory size configuration switches would also be a clue. I believe
that the early SCUs had a 256K word maximum configuration, the later 4MW
SCU a 4MW maximum; the settings on the configuration switches should
correspond to earlier or later models, but I don't have any correlation
between model names/numbers and capacity.

-- Charles

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