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 Post subject: IBM boards
PostPosted: Sat Mar 07, 2020 11:09 pm 

Joined: Fri Jul 01, 2016 6:55 pm
Posts: 750
Location: Texas
I know.....
The Dallas boxes on the two big boards will come off.
The brackets will come off.
The HDD board is still on the HDD.
Is it gold cap chip board or HDD board and can I pull the gold eprom if so what would it go as?


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 Post subject: Re: IBM boards
PostPosted: Sun Mar 08, 2020 1:22 am 
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Joined: Tue Feb 03, 2015 6:57 pm
Posts: 10498
Location: Low DOS
As is hard drive board
Removed it would be an ibm via chip only if it has gold pins. I don’t believe the that one does. I could be wrong as my memory fades but I believe that one uses a silver plated nickel pin


Backplane, yes you can trim

Remove bracket High telco
Remove bracket high telco
Gold finger card
Backplane don’t trim
Large socket motherboard
Large socket motherboard


The benchmarq box is the same as Dallas, needs to come off.

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 Post subject: Re: IBM boards
PostPosted: Sun Mar 08, 2020 7:56 am 

Joined: Fri Jul 01, 2016 6:55 pm
Posts: 750
Location: Texas
I thought the two larger boards were lg socket, but wasn't sure.
Since that is confirmed it confuses me a bit.

Which boards are the cpu’s (the two HT)? If so why are they not apple CPU’s? The two new pictures are of the silver colored chips with showing the numbers.


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 Post subject: Re: IBM boards
PostPosted: Sun Mar 08, 2020 1:21 pm 
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Those are definitely CPUs. Ibm implementations of Intel 32bit chips. One I believe is a 486-DX, the other is a AMD based MX686.

Let me cover your question and the other obvious one together.
Apple CPU. “Apple”. Apple is the largest use company but other companies made variants as well. This is a socket that has pin connectors to multiple other chips (controllers) on the board. They allow the processor board direct access and override access to various components. Hence the Apple name Processor Direct Slot.
This does not have such a connector architecture. Nor is it in the correct format size wise.

The slot processor architectures were the precursor to the direct access socket above.
These cards and matching sockets have two or three matching connector rows. In a very simplified explanation that is not completely accurate; for general understanding: One is the standard bus connector. The other row is the direct access row.
The card has separate memory for each level of cache. Ram for buffering beyond the cache, its own I/O controllers, etc. This has some of that but not all of it.
This is obviously not a slot processor.

So I look at the two places it can not go, and then where it obviously would go. Gold finger card. This is more populated than any standard GFC AND has a full CPU on it. So I know it’s better that GFC. So I look at the list and figure the next acceptable spot in line. High telco.

Hope that explain better.

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 Post subject: Re: IBM boards
PostPosted: Sun Mar 08, 2020 3:03 pm 

Joined: Fri Jul 01, 2016 6:55 pm
Posts: 750
Location: Texas
I was looking at the board with benchmarq box and was wondering if that was a the same as Dallas box. I was thinking there is no Dallas box or button battery on this one, how odd is that?.....well it is IBM and I have never encountered stuff quite like this.
Then I was reading back over your first response thats when I seen your comment about benchmarq box.

Yes your explanation makes some sense about the CPU ;)


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