18 Apr
2013
18 Apr
'13
7:56 a.m.
I took a look at the motherboard on the SUN 3/140 , mine has 500-1164-05 ,
near the DB9 video output I see two 380 ohm resistors.
On Wed, Apr 17, 2013 at 10:21 PM, Dave McGuire <mcguire at neurotica.com>wrote:
On 04/17/2013 04:39 PM, Jochen Kunz wrote:
Oh yes, I remember those! They didn't last very far into the
SPARCstation
era, if memory serves.
Those monitors are getting really tough to find. I'd like to have a few
for my 3/60s.
--
e-?
> Quite a few Sun framebuffers have ECL
outputs, but they're all very
old
ones
(older than the 3/140) and all monochrome.
I have some SBus bwtwo with ECL output.
They where used in the first
SPARCstation 1s. Regarding the cable length problem: Smells a lot
like a termination
problem. There are special differential ECL transmitter and receiver
ICs with build in active termination for this purpose.
What are the characteristics of those terminators? I wonder if that's
the
OP's problem as Tony suggested.
-Dave
--
Dave McGuire, AK4HZ
New Kensington, PA