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 Genuine 5170 AT mobo with generic case needs TLC View next topic
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Joined: 19 Apr 2006
Posts: 261
Location: WisConSin

PostPosted: Fri Mar 04, 2011 12:56 am Reply with quoteBack to top

My old 5170 has sat missing 1 piggyback chip for a long time and has 2 others dislodged.

I am curious if I can substitute Siemens 41256-12's in my old AT mobo.

I am uncertain if the pinouts are the same as the old TI ZA1250Nls aren't spec'd anywhere.

I have a feeling that if the address pins, voltage and ground end up where they are supposed to be the board should use the chips but won't see them at full capacity, probably half.

Any ideas?

Also on an off topic this board appears to have 2 standard BIOS chips and one of the old window type chips, IS the AT board one of those that would tolerate a bios from a more modern AT board?

I have a 1989 AMI 286 bios plus in the old ODD EVEN 2 chip format that looks like it would fit right in, unless those are for basica.

I really don't know much about the true blue AT, like I do for the PC/XT's

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Joined: 03 Feb 2006
Posts: 488
Location: pennsylvanai

PostPosted: Sat Mar 05, 2011 12:48 am Reply with quoteBack to top

I an guessing it is an IBM AT
I have some somewhere
including one in a box with the assition ram card..
but things are in a huge pile.
changing the bios? sure when i was at an intel co. we repaired one and they changed the bios.
I have some of those bio's somewhere.
3-4 sets.
I had a 12mhx LSI 286 mb and copied the bios at work and gave a copy to someone who had a close clone of the IBM at.
it had the type 47 so any hard drive ( up to dos and OS limits) could be used. meaning with an IDE controller you can use up to 2,048m with dos 6.22.
I THINK you can use a 4g if you divide it to two 2g partitions not 100% sure.
want qa 4g drive ? for shipping.
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