TheaterFire

Help me determine the origin of this motherboard! Please :D IBM

Posted by DeliveryUnhappy5082@reddit | vintagecomputing | View on Reddit | 13 comments

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13 Comments

Goldenyellowfish@reddit

https://www.nf6x.net/2014/09/ibm-5322-system23-datamaster-internals/
View on Reddit #84849936

DeliveryUnhappy5082@reddit (OP)

Thank you ! You are the best !!!
View on Reddit #84850568

Bits_Passats@reddit

That's a System/23 Datamaster. I, personally, have made reverse-engineering of the board and wrote a MAME driver. If you need assistance bringing it up to work just tell me. That being said, from the pictures I can say the following: \* It has 16 system ROMs. So a late 5322 or a 5324. \* No DRAM card. We are working on a contingency for cases like this. \* European motherboard, as it has two oscillators. \* No jumpers on the configuration pins. I should take a look into what it does mean both in the service manual and the driver I wrote \* No keyboard. We are currently working on a contingency, although I was able to trick the motheboard to think it has one. \* No floppy disk controller card. If you manage to get it working, you won't be able to load or store programs other than typing them. The FDC card still needs reverse-engineering work. Oh, and another thing. Dump the ROMs ASAP. The ones the System/23 carries are very, very nasty. They are the main cause of failure for this class of computer, other than RAM capacitors. Finally, again I extend my hand to you. If you want to make it work send me a DM. I will put all the available resources I can, but only if you are willing to deal with the maintenance work yourself.
View on Reddit #84924968

uburoy@reddit

You are amazing.
View on Reddit #85065879

Bits_Passats@reddit

Thank you, but I am not. I consider myself just a bit better than an amateur in electronics - I really have difficulties with analog. On the other hand, I find digital easy. I was able to thrive enough with this particular computer because there wasn't enough general interest in it, unfortunately. However, seeing the disarray wasn't enjoyable, so I decided to study and document it. Sharing the data I was obtaining is just restorative justice to the computer and the team who designed it.
View on Reddit #85075403

KeyPiglet8147@reddit

Key Features of this Board Processor: It was designed for the Intel 80286 processor, a 16-bit CPU that offered significant performance improvements over the earlier 8088-based PC and XT models. Expansion Slots: The board features several 16-bit ISA (Industry Standard Architecture) expansion slots, which are the longer black connectors visible at the top left. Memory: It could address up to 16 MB of memory, compared to the 1 MB limit of its predecessors. Connectors: The distinct red connector and the various socketed chips are typical of IBM's early mid-80s hardware design. Wikipedia Wikipedia This is what Gemini finds ... The board in the image is an IBM PC AT 5170 System Board, manufactured by IBM.
View on Reddit #84856881

boblecastor@reddit

I had respect for Gemini… ISA AT slots are a combination of the ones on top left with the ones at top right : but inline not separated. I understand why he think it was a AT motherboard
View on Reddit #84859936

Bits_Passats@reddit

No. The small slots are for DRAM memory cards only. As you can see, there's no RAM in the motherboard.
View on Reddit #84925060

Bits_Passats@reddit

This is not even a PC. Look, it doesn't even has RAM on it.
View on Reddit #84925016

bonzog@reddit

When someone asks a group of people (like a subreddit) a question, I think it's borderline rude to regurgitate an AI answer at them. Especially when it's wrong. If they wanted to ask Gemini, they would have bloody asked Gemini.
View on Reddit #84880670

Plaidomatic@reddit

Did you use your own eyes to see how this could not possibly be an AT? Or did you post this to show how wrong Gemini, and by extension you, could be?
View on Reddit #84873170

Away-Ad-3407@reddit

she’s a beaut clark!
View on Reddit #84888386

melk8381@reddit

Fuckin tasty!
View on Reddit #84873095