[rescue] Sun SBus serial cards

[Mouse]

>> I am looking for a SBus serial card to use on a Sun4m system.  [...]

> Async serial cards were pretty rare in general.  While there weren't
> none, companies did tend to make lots of things for lots of markets,
> including custom Sun S-Bus async serial.

I lucked into a Magma 16-port serial card, long enough ago I don't
recall where I got it from:

magma0 at sbus0 slot 3 offset 0x0 level 9 softpri 6: Magma 16 Sp
magma0: CD1400 0 addr 0xfe23d000 rev 46 clock 25Mhz
magma0: CD1400 1 addr 0xfe23e000 rev 46 clock 25Mhz
magma0: CD1400 2 addr 0xfe23f000 rev 46 clock 25Mhz
magma0: CD1400 3 addr 0xfe240000 rev 46 clock 25Mhz
mtty0 at magma0: 16 ttys

It has an idiosyncratic connector with an external screw-on unit that
breaks it out into one 8P8C connector per port.  (I _have_ fiddled with
the magma driver, but, based on the commit messages, not very much.)

I use it for serial consoles.  I currently have 12 ports assigned to 12
different machines' serial consoles....

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