Hey everyone, thanks for always serving as a great sounding board and
source of advice!
I have an issue with a PDP8E which has an issue with the power supply.
The -15V, 15V, and 5V are good, and my Bus Loads board is good, but for
some reason the power supply is bringing down the 3.75V signal
Well... Finally figured it out! Found a lose solder blob shorting 2
pins on one of the motherboard ICs. That explains why I've been going
crazy trying to figure out why it's been so random and intermittent.
Thanks everyone for chiming in, and helping out!
On 1/1/2018 6:12 PM, Nick Allen wr
I spoke too soon, I think simply cleaning the contacts rattled a short
and dumb luck made it boot the first time. By pressing the fatherboard
I can see characters corrupt when running a program, guess I need to do
some more digging to find out exactly where and why this is happening.
On 1/1/
cleaning the connector pins with a brass brush solved the issue, thanks
everyone!!
On 1/1/2018 5:03 PM, Nick Allen wrote:
Thanks for the tips everyone! I can confirm power is GOOD, and the
problem persists even without the RAM installed (Just CPU and MP-C or
MP-S board). I am going to clean
Thanks for the tips everyone! I can confirm power is GOOD, and the
problem persists even without the RAM installed (Just CPU and MP-C or
MP-S board). I am going to clean the buss connectors and see if it helps!
On 1/1/2018 12:32 PM, Nick Allen wrote:
Hey everyone, Happy New Years! I am thank
Hey everyone, Happy New Years! I am thankful for an active community
that enjoys helping each other learn, and today I am coming with an ask
for help.
I have a SWTPC 6800 and ADM3A terminal, I can get it to boot, and when
it boots it will continue to boot for several hours. But getting it to
I am almost complete in fixing my Xerox Alto (been a 7 year journey,
have the power supplies, CRT, and boards all working). I can get the
Alto to run the microcode to boot, but my disk drive is not working so I
can not boot (looking into Network boot with Carl, but this is not yet a
possibility
wow impressive work Brad! Thanks for blogging about it, it's fun to
watch you progress. Ever consider selling some of the PCB boards, and
coming up with a BOM list, so we can recreate some too?
