Yeah, I think that's the only way

Or you could try to tear the battery from the solder point of that thing and then tape a new battery, but that won't be pretty ^^

Sadly it requires desolder from the board and not the "arms/legs" since that is a type of standard cell battery.
Recommend to solder a holder to the board after instead.

tabm0de wrote:

that is a type of standard cell battery.

Ah, so the legs are all part of the battery... ok... damn. I do have a holder for CR2032 but it is not the same footprint... some short bits of wire may be in order. Maybe just have it off board altogether would be easier.

if you want u can replace with a super capacitor instead of a batt what i do on my amigas these days

Yep, soldered-on. However unless I'm mistaken that tabbed package often has a pin spacing compatible with common 'through-hole' CR2032 holders so swapping it out with something replaceable might be easy.

kev wrote:

if you want u can replace with a super capacitor instead of a batt what i do on my amigas these days

This is not a rechargeable battery, a supercap is pointless here. As it will stay flat

Maeslin wrote:

that tabbed package often has a pin spacing compatible with common 'through-hole' CR2032 holders so swapping it out with something replaceable might be easy.

Well, thats exactly what I did. The CR2032 holder I had didn't have pin spacing that was compatible, but I salvaged one from a dead LGA775 motherboard I had that fit pretty well perfectly. Due to the pin arrangement, the new holder is a little skewed, but.. whatever, it works.

However, all that effort and the system still presents "102 - System Board Error". Now I'm starting to get angry 😠

My next idea is to try a power supply with actual -5V to see if maybe the board doesn't like that being absent for whatever reason (I am just using a modern-ish ATX supply with basic ATX-to-AT adapter). We'll see how that goes...

RJDog wrote:

My next idea is to try a power supply with actual -5V to see if maybe the board doesn't like that being absent for whatever reason

Nope.. that wasn't it either. I really have no idea what to do next, other than desperately try to find a service manual for this thing and ensure the ~10 jumpers are set correctly on the board...

Sorry, just notes for my future self;

http://www.datasheet4u.com/mobile/860023/VL82C114.html
https://www.google.ca/url?sa=t&source=web&rct … yLvlgrHYhWsOf-g

My newest suspicion (read: hope?) is that maybe the "Clear CMOS" jumper is set incorrectly... I'll be able to check it out in a couple days...

Is that a BR2330 battery? You have 2 pins on one side and one in the middle.

https://www.alliedelec.com/panasonic-br2330a-ga/70196829/

Unknown_K wrote:

Is that a BR2330 battery? You have 2 pins on one side and one in the middle.

Yup thats correct; the CR2032 holder I installed fits between the one (negative) terminal and one of the two "side" (positive) terminals. There is a trace on the PCB between the two "side" terminals, so no worries about continuity (at least between those two pins... I haven't checked for valid continuity everywhere else)

RJDog wrote:

My newest suspicion (read: hope?) is that maybe the "Clear CMOS" jumper is set incorrectly...

Well my friends, that was indeed the problem. Using the manual I found, I was able to determine that P14 was the "Clear CMOS" pin which, as it turns out, really just provides the Vbat from the battery cell to pin 81 of the RTC chip. Floating voltage on pin 81 with no jumper on P14 (as it was shipped to me), 2.9V on pin 81 with jumper present on P14 😀

Now I feel like an idiot for not checking that first, but I don't feel that replacing the previous coin cell battery with a new CR2032 holder was wasted effort... for one, it is now a removable and easily replaceable battery type and, second, the voltage on the old cell was well below spec for the RTC so it probably needed replacing anyway (battery was 2.2V, RTC needs 2.4V).

Happily booted into DOS off a floppy now 😊

Congrats... Nothing like fixing it personally. 😀

RJDog wrote:

Happily booted into DOS off a floppy now 😊

Wow man, that's great!
Congratulations!!! What's an RTC?

I would be grateful if you could have a look at this post of mine about a Compaq Prolinea 4/66, any suggestion would be greatly appreciated:
Re: SOLVED Compaq Presario CDS 524 - 102 - System board failure

Thanks so much!

I know this is an old thread but it has helped me in repairing/rebuilding a very similar more modern PC Compaq Deskpro 2000 / model 5200 (Socket 7, single voltage, Intel Pentium 200Mhz),
there is the same stupid battery with welded contact points. Possible to replace with CR2032 holder - however one must be looking for a proper one - not all of them fits - me also used one from some dead socket 775 board.
BUT: don ´t give up if it does not work - my CMOS jumper was at the right place, but the pins a bit corroded and the board was not holding the settings. After "clearing the cmos" and rubbing the pins a bit everything is reliable and OK.
One remark: if you have got one of these pretty cool Compaq machines and you are not able to get into the BIOS SETUP, you need a special diskette to do so. There is no setup on-board! It was a bit of pain to find it. I will upload it later or if any of you going through this, leave me a message. The SETUP might be stored on your original drive, but in case the drive is lost or deleted you need the diskettes to make it to factory state again.
Thank you to RJDog, this thread inspired me to finish it.

H.W.Necromancer wrote on 2022-05-10, 15:11:

I know this is an old thread but it has helped me in repairing/rebuilding a very similar more modern PC Compaq Deskpro 2000 / mo […]
Show full quote

I know this is an old thread but it has helped me in repairing/rebuilding a very similar more modern PC Compaq Deskpro 2000 / model 5200 (Socket 7, single voltage, Intel Pentium 200Mhz),
there is the same stupid battery with welded contact points. Possible to replace with CR2032 holder - however one must be looking for a proper one - not all of them fits - me also used one from some dead socket 775 board.
BUT: don ´t give up if it does not work - my CMOS jumper was at the right place, but the pins a bit corroded and the board was not holding the settings. After "clearing the cmos" and rubbing the pins a bit everything is reliable and OK.
One remark: if you have got one of these pretty cool Compaq machines and you are not able to get into the BIOS SETUP, you need a special diskette to do so. There is no setup on-board! It was a bit of pain to find it. I will upload it later or if any of you going through this, leave me a message. The SETUP might be stored on your original drive, but in case the drive is lost or deleted you need the diskettes to make it to factory state again.
Thank you to RJDog, this thread inspired me to finish it.

Wow, thanks so much for your update!
If you don't mind, I'll message you my email as it could be good to remain in touch in case of future info exchange. I have some old Compaq PCs (Deskpros and a ProLinea).

Hallo, yes feel free to contact me. I need to find some time to make images of those 2 floppies and share them. It would be much easier than downloading the exe file and creating the m the way I did...My machine is now equipped with a voodoo 1 card and SB 16 Vibra ISA sound card and it serves as a 1996-1997 dream game box (-:

H.W.Necromancer wrote on 2022-05-11, 06:16:

Hallo, yes feel free to contact me. I need to find some time to make images of those 2 floppies and share them. It would be much easier than downloading the exe file and creating the m the way I did...My machine is now equipped with a voodoo 1 card and SB 16 Vibra ISA sound card and it serves as a 1996-1997 dream game box (-:

Fantastic, thanks! I'm about to send you my email via direct message 😀