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