Looking at the PSU edge connector again...

The top row, left to right:
-one signal pin (low current)
-6 power pins; +12 V, based on the bodge
-17 power pins; +5V no doubt
-another signal pin

The thick trace right below gives us some idea about the pins on the
solder side - all possibly connected together (ground), with the
exception of the rightmost pin (see the vias).

Does that sound familiar?

https://ardent-tool.com/50_70/Power.html

Yep, looks like the pinout may be a copypasta as well (needs
confirmation before any action ♪).

Btw, the connector drawing on the page above seems to be off by one pin
(the +12/+5 V split. I'll fix that too...

On 21.12.2021 22:02, schimmi wrote:

Tomas Slavotinek schrieb am Dienstag, 21. Dezember 2021 um 21:59:40 UTC+1:

That will be the reason then. One bad socket and you lose the entire
bank - four sockets for a 32-bit system. From my experience, it's rather
difficult to get it working reliably with one latch broken. You have to
get creative and add some kind of support or better replace the entire
socket.

Or, you know, use a memory expansion adapter... :)
On 21.12.2021 21:50, schimmi wrote:

Tomas Slavotinek schrieb am Dienstag, 21. Dezember 2021 um 21:45:32 UTC+1: >>>> I meant the SIMM sockets there (as an answer to Louis' question). Only >>>> the cheapest ones are all-plastic, most have either metal support around >>>> the release clips or all-metal latches (but some of these tend to break >>>> as well).

On 21.12.2021 21:36, schimmi wrote:

Tomas Slavotinek schrieb am Dienstag, 21. Dezember 2021 um 21:14:25 UTC+1:

Hard to tell from the grainy photos but one of the release levers on the >>>>>> left side looks somewhat mangled (4th slot from the top). Are these the >>>>>> nasty all-plastic sockets?
On 16.12.2021 21:50, schimmi wrote:

Leads to the question, why the free onboard-RAM slots were not utilised first.
¯\_(ツ)_/¯

Are there any other sockets than plastic ones? They seem to be fine :) https://photos.app.goo.gl/tabwnRspu6oHbqGh7

Ah, the RAM-Slots. Yeah, turn into the cheap street. And yes, the 4th slot is indeed broken.

it's just the holder, nothing, that cant't be fixed :) just added a main pcb photo, feel free to find more issues :D

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