Re: How to access to Open Firmware via Null-modem?

[Michael Lorenz <macallan%netbsd.org@localhost>]

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Hello,

On Jan 2, 2008, at 09:09, R.D. Hammond wrote:

> I use 38400 8N1 /TYPICALLY/ some four-fingered salutes will return  
> the mobo to its factory condition. I think 7 rounds of Meta+Alt+P+R  
> clears the PRAM of ALL settings. (Including current date/time and  
> total uptime, on some (?all) systems.) Then the meta+alt+O+F should  
> put you at the prompt. feq counters, silly-scopes can help narrow  
> it down, or a pair of headphones if you are really really good.

... and if that doesn't help unplug, take out the battery, hold the  
CUDA reset button for a minute or so, try again.

> For The Record: My e250s have two single-channel DB25 DTE sockets.

Some Suns have 8 pin mini DIN connectors, I used an adaptor made for  
Macs with one of those, that's why I asked, I had no idea what kind  
of connectors the E250 has ;)

> Remember the Mac has differential RS422 (or better) signaling that  
> garantees voltage relative to ground at the transmitter,good for  
> backwards compatability OR long distance+highspeed.

Reminds me - many Suns have jumpers on the mainboard to select RS422  
or RS232 signalling.

have fun
Michael
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