THANKS! Guys,,,,
May I use the images you have shown here on the https://AtduinoInfo.Info wiki where I am collecting this with LOTS of other stuff?
Regards, Terry
Wow.. Gave one away at least 15 years ago... I LIKED the 7531 . I was the "IBM Industrial Computer Coordinator" (among other jobs) at an IBM Semiconductor factory site. Major dogfights over these Industrial versions VS things like PS-2 model 80's... And then there was blood over "Industrial...
Wow... Just got the new caps to try to resurrect three 5154's. Usual "works 10 minutes then Zap-Smoke/ That's the easy one.. Now I have one Horizontal Jitter, and One Apparently Dead.
A challenge! I do have the schematics etc... Now I have to tune my head, which was 55 years old in 1995 :-)
Thanks @Chuck(G) and @IBMMuseum ...
Help me be 100% on what PINS are involved with the Dremel Surgery. The photo above shows a BIOS chip that is 28 pins. But the DALLAS chips are 24 pins. so I'm not sure EXACTLY what pins you have modified. Can you mark or number per this pinout...
QUOTE "soldering that chip in was the mark of a malicious vendor"
Looks like PLANNED Obsolescence. Like "Buy my new motherboards in 15 years when this dies??"
I'm just interested if this easy, No Soldering solution will stand up. My Dremel(s) are at the ready, usually for sharpening my...
Hi Chuck, Thanks.. your diagrams are great.
It's pretty drastic to Dremel the module. In my case it's almost inaccessible right next to an ISA socket. This is different in using the "Clear CMOS" connection.
IF this works for months with two AA batteries I'll be happy... I'll update my...
Hello Everyone,
Many have had this dilemma; mine was worse because I have 3 HOT-555 motherboards with the same SOLDERED IN RTC CMOS CHip.
Eventually I got one to work WITHOUT Soldering.. Take a look here:
https://arduinoinfo.mywikis.net/wiki/DS12887A-DALLAS-RTC-DEAD
Let me know if this works...
@modem7 You are Way Way ahead of me. I have seen that you have helped many many people over many years... You are a great example of how This Internet Stuff can actually work!
GOOD Point! M3 is the cable from the on-off switch. And M1 and M2 which would send all voltages to the main board are disconnected and can be test points.
Thanks!
Yes that's a good description. I'll study the schematic some more. I do have a CRO (7854 Tek) but I have a handy small LCDO ;) At one point today after 5 Hr poweron it really smoothed out. Makes me suspect an electrolytic that reforms a little.
Thanks for help thinking this through.
OH...
Hi Vic, THANKS and I am digging into this today.
Question: What jumpers did you need to power up the module separate from system? The schematic shows the main power switch is remote and there are 4 connections to it. Looks like 2 jumpers could route power from the power cord to it. Or 120V...
@modem7, THANKS for the pointers....
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"Just in case relevant later, can you tell if it is a horizontal collapse, or a horizontal shift? "No, it's a small deflection wiggle, worst at power on. There's a video here...