[rescue] 611s, 411 and ELC motherboards needing new homes (UK)
jkunz at unixag-kl.fh-kl.de
Tue Apr 22 03:39:30 CDT 2008
On Mon, 21 Apr 2008 15:03:34 -0400 (EDT)
der Mouse <mouse at Rodents.Montreal.QC.CA> wrote:
I did somthing similar, so I can add some experience. The ELC CPU board
only needs +5 V. I never found out what the -5 V is used for. I
measured current on all supply voltages and there was no current draw
on -5 V. So I left -5 V unconnected. It needs about 2 A on +5 V with a
single SIMM. Current draw on +-12 V is only a few mA. I suspect +-12 V
is only needed for the serial ports. So I used a PSU from an external
SCSI disk box to feed the ELC CPU board. I get +5 V and +12 V from the
PSU. -5 V is unconnected. I used this simple voltage inverter to
generate the -12 V: http://www.unixag-kl.fh-kl.de/~jkunz/inverter.pdf
Later I mounted this ELC board in a SCSI disk box together with a spool
disk, a CDROM and a CD-Recorder making it a CDR burn appliance.
Pins C and D on the 6 pin connector are in deed Csync. (One pin is GND, the other is the usual TTL level sync.) Once I connected this Csync and the video signals from the RCA plug to a monitor and got video output from the ELC on the screen.
BTW: You can mount a Sun 600MP VME board in a 3/60 chassis. But the
3/60 chassis doesn't supply -12 V. So you can't use serial console on
the 600MP board. It works fine with a CG6 and keyboard. The voltage
inverter above can solve the -12 V problem quite easily. IIRC the -12 V
line is brought to the PSU from the "backplane", but unconnected at the
PSU. So you can mount the inverter in the PSU section of the chassis.
More information about the rescue