weedeewee wrote on 2024-03-31, 17:10:

https://ram-co-shop.de/16-MB-EDO-RAM-60-ns-72 … GM71C17403BJ6_1 […]
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jasposiris wrote on 2024-03-31, 17:03:

And I just tested with some ram not labellized edo (so probably fpm picture attached) with no improvement..
IMG_20240331_185226.jpgIMG_20240331_185218.jpg

https://ram-co-shop.de/16-MB-EDO-RAM-60-ns-72 … GM71C17403BJ6_1

still edo

additional. a 386sx only supports up to 16MB or RAM, so try to find some FPM sticks of 1, 2, 4 or 8 Meg size

Thanks a lot, I'll check tomorrow in other stocks!

Doigan wrote on 2024-03-31, 17:22:

jasposiris wrote on 2024-03-31, 16:22:

Thanks a lot! Here is pics of my motherboard which is not booting..
386sx 20, ram 72pin edo, trident 8900c VGA chipset and acc micro 2036 chipset.
Yet I only have 3 long beeps when there is no ram, but nothing on the screen unfortunately..IMG_20240330_213731.jpg.

Wow! That sure looks to be the very same motherboard, just a tad faster CPU - impressive! Would you be interested in selling it?

Possibly but before I would need to make it work! Post card ordered and will check for corrosion ñext week!

jasposiris wrote on 2024-03-31, 17:33:

Doigan wrote on 2024-03-31, 17:22:

jasposiris wrote on 2024-03-31, 16:22:

Thanks a lot! Here is pics of my motherboard which is not booting..
386sx 20, ram 72pin edo, trident 8900c VGA chipset and acc micro 2036 chipset.
Yet I only have 3 long beeps when there is no ram, but nothing on the screen unfortunately..IMG_20240330_213731.jpg.

Wow! That sure looks to be the very same motherboard, just a tad faster CPU - impressive! Would you be interested in selling it?

Possibly but before I would need to make it work! Post card ordered and will check for corrosion ñext week!

Very positive! It would mean the world to me to be able to buy it and to once again make my first ever PC come to life. And I would buy it as is, even if it does'nt boot 😀 Please let me know after you've had a look at it. Best of luck!

jasposiris wrote on 2024-03-31, 17:33:

Doigan wrote on 2024-03-31, 17:22:

jasposiris wrote on 2024-03-31, 16:22:

Thanks a lot! Here is pics of my motherboard which is not booting..
386sx 20, ram 72pin edo, trident 8900c VGA chipset and acc micro 2036 chipset.
Yet I only have 3 long beeps when there is no ram, but nothing on the screen unfortunately..IMG_20240330_213731.jpg.

Wow! That sure looks to be the very same motherboard, just a tad faster CPU - impressive! Would you be interested in selling it?

Possibly but before I would need to make it work! Post card ordered and will check for corrosion ñext week!

I found an image where mine shows the full motherboard (with the ISA riser card, only the DB25 was desoldered since is was covered in corrosion). I'm still amazed there are another one out in the wild there.

As i mentioned, I'm interested in buying it as is, just let me know 😀

Actually I will be pleased to offer it to you ! I'll keep you updated on my attempts to make it work and worst case scenario would send it to you unrepaired..
Next steps: fpm ram, replace pram battery and check for damaged traces...

Doigan wrote on 2024-03-31, 18:11:

jasposiris wrote on 2024-03-31, 17:33:

Doigan wrote on 2024-03-31, 17:22:

Wow! That sure looks to be the very same motherboard, just a tad faster CPU - impressive! Would you be interested in selling it?

Possibly but before I would need to make it work! Post card ordered and will check for corrosion ñext week!

I found an image where mine shows the full motherboard (with the ISA riser card, only the DB25 was desoldered since is was covered in corrosion). I'm still amazed there are another one out in the wild there.

As i mentioned, I'm interested in buying it as is, just let me know 😀

Nice picture! So you have the 316a while mine is a 320a!
We're you able to find any info on this mb online? Checked all retro web without finding anything..

jasposiris wrote on 2024-03-31, 18:28:

Actually I will be pleased to offer it to you ! I'll keep you updated on my attempts to make it work and worst case scenario would send it to you unrepaired..
Next steps: fpm ram, replace pram battery and check for damaged traces...

Thank you so much! This means a lot to me.

I have searched long and far for some additional information on the web but without any success unfortunately and the manuals we had when we got this way back only included the ones for MS-DOS and nothing about the computer it self 🙁

Quick update (but I'll explain more in details later):
I was able to make it boot!
And yes it is a copam motherboard yet unregistered on the retro web!

jasposiris wrote on 2024-04-11, 21:45:

Quick update (but I'll explain more in details later):
I was able to make it boot!
And yes it is a copam motherboard yet unregistered on the retro web!

This is such great news! So happy about this 😁

So here is a more detailed update!
- first, I had to clean traces around the pram battery, since oxydation particles were creating contact around the io controller

- then a pin of the graphic chipset was bent and probably creating a short to the nearby pin

- finally thanks to a POST card I was able to find a recognized simm barrett

it looks like LG frm 4mo ram...

I'm gonna solder a lithium pram battery and varnish some parts of the pcb, and then Doigan I should be able to send it to you. Could you send me your address?

jasposiris wrote on 2024-04-15, 14:43:

I'm gonna solder a lithium pram battery and varnish some parts of the pcb, and then Doigan I should be able to send it to you. Could you send me your address?

That is great news! It looks like you have done some really good progress 😁 I'm very happy. I will send you a PM!

(please send me your email address in pm since I can't yet send answers to pm messages because my account is too new ...)

jasposiris wrote on 2024-04-15, 22:57:

(please send me your email address in pm since I can't yet send answers to pm messages because my account is too new ...)

Gotcha! ☺️

Did you receive my email?

jasposiris wrote on 2024-04-25, 21:22:

Did you receive my email?

Yes, did you not receive my reply? I will send it again maybe it got stuck in spam 🙁

jasposiris wrote on 2024-04-25, 21:22:

Did you receive my email?

I sent a fresh one now, check if it got through from my address ☺️ hopefully it did not get stuck this time.