9 Dec
2018
9 Dec
'18
9:45 a.m.
Can't comment on the monitor, but I haven't had good luck with modern 48T02
devices and old Sun systems. Apparently ST changed something in how the
clock section works, iirc it's timing related. Definitely rebuild your old
NVRAMs! I've got a little repair board I made up for it:
http://www.glitchwrks.com/2017/08/01/gw-48t02-1
The files are on GitHub if you want to run your own, or I've got them
assembled and ready to be installed on your NVRAM.
Thanks,
Jonathan
On Sun, Dec 9, 2018 at 10:55 AM Guy Dunphy via cctalk <cctalk at classiccmp.org>
wrote:
Checking out a SUN SPARC station ELC tonight. It
powers up, passes self
test.
Boot fails because the CMOS RAM battery is dead, so it's lost boot config.
That's no problem, it's an ST MK48T02B-25 'TIMEKEEPER RAM' 2K x 8, which
is still available. Or I'll probably just cut open the tophat and connect
a new battery.
Then RTFM to find how to tell it to boot from external SCSI device 3.
By extreme good fortune this machine came with a complete set of manuals.
The main problem is the video monitor worked for a few minutes, then
dropped to
about half brightness - and since then is randomly varying in brightness.
Before I open it up and start connector wiggling and hunting bad caps, dry
joints
and so one, does anyone know if schematics for the monitor exist online?
Guy