Thank you (all of you)

I really think that  the problems is in the cable pinout because, reading
and trying all the possibilities the best thing I obtain in the minicom is
this:

Welcome to minicom 2.3-rc1

OPCIONES: I18n                                                             =
 =20
Compilado en Dec  9 2007, 12:37:36.                                        =
 =20
Port /dev/ttyS0                                                            =
 =20
                                                                           =
 =20
               Presione CTRL-A Z para obtener ayuda sobre teclas especiales=
      =20
                                                                           =
      =20
|y=3DX=EF=BF=BD2=EF=BF=BD3i=EF=BF=BD=EF=BF=BDI=EF=BF=BD=EF=BF=BD=EF=BF=BDr=
=EF=BF=BD=EF=BF=BDf=EF=BF=BDfM=EF=BF=BD=EF=BF=BD=D6=AEB~rBF.ZF*j~vBB.ZFb~.^=
j~=EF=BF=BDzr=C2=B2~.>j=16=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD=EF=BF=BD6j.*=
6F=06=EF=BF=BD=D6=AEB~rBF.ZF*j~vBB.ZFb =20
~f6BJ~.^j~njfz*N.~vBB.~nj&Zrj~.=EF=BF=BD

For this I've connect the adapter from Din-8 modem port in the Mac to Seria=
l
DB-9 with a null-modem... If I connect only the adapter from Din-8 to DB-9 =
I
don't obtain anything.

My next check, the pinout!!! Here I go!

Michael, to connect from an E250 to a PC is necessary only a null-modem fro=
m
the DB-25 'A' port in the Sun to a DB-9 Serial port in the PC. The Din-8
port is only (I think) for the keyboard and mouse.

Regards!


Michael Lorenz wrote:
>=20
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>=20
> Hello,
>=20
> On Jan 2, 2008, at 09:09, R.D. Hammond wrote:
>=20
>> I use 38400 8N1 /TYPICALLY/ some four-fingered salutes will return =20
>> the mobo to its factory condition. I think 7 rounds of Meta+Alt+P+R =20
>> clears the PRAM of ALL settings. (Including current date/time and =20
>> total uptime, on some (?all) systems.) Then the meta+alt+O+F should =20
>> put you at the prompt. feq counters, silly-scopes can help narrow =20
>> it down, or a pair of headphones if you are really really good.
>=20
> ... and if that doesn't help unplug, take out the battery, hold the =20
> CUDA reset button for a minute or so, try again.
>=20
>> For The Record: My e250s have two single-channel DB25 DTE sockets.
>=20
> Some Suns have 8 pin mini DIN connectors, I used an adaptor made for =20
> Macs with one of those, that's why I asked, I had no idea what kind =20
> of connectors the E250 has ;)
>=20
>> Remember the Mac has differential RS422 (or better) signaling that =20
>> garantees voltage relative to ground at the transmitter,good for =20
>> backwards compatability OR long distance+highspeed.
>=20
> Reminds me - many Suns have jumpers on the mainboard to select RS422 =20
> or RS232 signalling.
>=20
> have fun
> Michael
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.4.7 (Darwin)
>=20
> iQEVAwUBR3u7rspnzkX8Yg2nAQKzTwf/bdE7m7dLG+NrjpHuLLcDM3wkcyV+7d0Q
> qN/7OrNoos6Fy2T97z+ytz5VEPrq4grsrFnuYBf4dx4073JXRo2kBwJ4HhFal9yV
> RuCK6DjHoS861iVVprKggaWfI8/mO1s19CZFpHM4RKGcKEQJu1jGh/9H4v31EFJs
> BzWE1ZJdAoOW62Ic8L3oAzUrF4NCU4LttRLTNjugPCnz72zubcYcMIGdIF97IPTD
> EoMou/pyULLu+35f4Lh2rCtUae2SL+xX5N7zkWezTdKGebigDYNXLpOnv6N3DvOX
> MayTPQTmUTg0PPs8hTc6tQI17nyIO+bb22pNTT+kLTxgpGL3GU8W9Q=3D=3D
> =3DY5k2
> -----END PGP SIGNATURE-----
>=20
>=20

--=20
View this message in context: http://www.nabble.com/How-to-access-to-Open-F=
irmware-via-Null-modem--tp14566316p14583153.html
Sent from the port-macppc mailing list archive at Nabble.com.