[rescue] Serial console - break "filtering" connection - resistor method

[vom513]

> On Oct 16, 2023, at 7:44 PM, John-Paul Stewart via rescue <rescue at sunhelp.org> wrote:
> 
> 
> 
> Indeed.  Pin 25 was used for -5V in the Sun3 era according to:
> 
> http://www.sunhelp.org/faq/sunref3.html
> 
> Search for VERR to find the references.
> 
> Pin 25 was also used, but for a totally different purpose, on some of
> the later machines that had two serial ports in one DB-25 connector
> (such as the SparcStation 10 & 20).  But that doesn't apply to your IPX.
> 
> https://www.sunhelp.org/unix-serial-port-resources/serial-pinouts/

Yep thanks - that lines up with what I’m seeing.  I also have an ss10+ss20 - but I’m really hoping there is a single pinout “to rule them all”.

I’m using a db25 serial breakout as well - and have tried several different connections from that old thread etc. and so far no dice.  Turning off the terminal and back on drops me to “db>” in NetBSD (I’m bootin single user/ro as to not fsck thrash the disk).