Intel 2107 dram sub....anything?

[boardjunkie1]

I'm working on a pc of equipment that uses these 2107 rams and having
nothing but problems with them. They're odd that they don't use a RAS
or CAS. I'm thinking they are their own animal and there's nothing
that can be hacked in as a replacement. The story goes that they were
manufactured on a site that was slightly radioactive leading to the
gradual degradation over time, so I'm a bit hesitant to track down NOS
parts. Any hope or am I dead in the water?

http://www.jrok.com/datasheet/mm5280_d2107_mb8107_tms4060.pdf

 

[Franc Zabkar]

On Tue, 21 Aug 2012 15:28:20 -0700 (PDT), boardjunkie1
<boardjunkie1@gmail.com> put finger to keyboard and composed:

I'm working on a pc of equipment that uses these 2107 rams and having
nothing but problems with them. They're odd that they don't use a RAS
or CAS. I'm thinking they are their own animal and there's nothing
that can be hacked in as a replacement. The story goes that they were
manufactured on a site that was slightly radioactive leading to the
gradual degradation over time, so I'm a bit hesitant to track down NOS
parts. Any hope or am I dead in the water?

http://www.jrok.com/datasheet/mm5280_d2107_mb8107_tms4060.pdf

If all 12 address lines are strobed at the same time, then ISTM that
you may be able to replace the DRAM with a static RAM.

In fact, if you have a bank of these DRAMs, say 4Kx16 or 4Kx8, then
you may be able to replace the entire array with one or two SRAMs.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

 

[boardjunkie1]

On Aug 21, 7:14 pm, Franc Zabkar <fzab...@iinternode.on.net> wrote:

On Tue, 21 Aug 2012 15:28:20 -0700 (PDT), boardjunkie1
boardjunk...@gmail.com> put finger to keyboard and composed:

I'm working on a pc of equipment that uses these 2107 rams and having
nothing but problems with them. They're odd that they don't use a RAS
or CAS. I'm thinking they are their own animal and there's nothing
that can be hacked in as a replacement. The story goes that they were
manufactured on a site that was slightly radioactive leading to the
gradual degradation over time, so I'm a bit hesitant to track down NOS
parts. Any hope or am I dead in the water?

http://www.jrok.com/datasheet/mm5280_d2107_mb8107_tms4060.pdf

If all 12 address lines are strobed at the same time, then ISTM that
you may be able to replace the DRAM with a static RAM.

In fact, if you have a bank of these DRAMs, say 4Kx16 or 4Kx8, then
you may be able to replace the entire array with one or two SRAMs.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.

They are used in banks in this application. 2 banks of 8 with the data
out at pin 7 shared in pairs. The static ram idea is a thought. I'll
have to see what I have on hand that may work.

http://www.flickr.com/photos/62937081@N00/7834705704/sizes/l/in/photostream/

That is the configuration.

 

[JW]

On Tue, 21 Aug 2012 15:28:20 -0700 (PDT) boardjunkie1
<boardjunkie1@gmail.com> wrote in Message id:
<7a3019d6-9c8f-4d77-8419-5a119f3ce783@l6g2000yqh.googlegroups.com>:

I'm working on a pc of equipment that uses these 2107 rams and having
nothing but problems with them. They're odd that they don't use a RAS
or CAS. I'm thinking they are their own animal and there's nothing
that can be hacked in as a replacement. The story goes that they were
manufactured on a site that was slightly radioactive leading to the
gradual degradation over time, so I'm a bit hesitant to track down NOS
parts. Any hope or am I dead in the water?

http://www.jrok.com/datasheet/mm5280_d2107_mb8107_tms4060.pdf

If those were the DRAM chips that had the bit-flipping problem with the
ceramic packages made from clay that were slightly radioactive, look for
replacements that are in a plastic case.

See http://en.wikipedia.org/wiki/Timothy_C._May

There's 6 of them here:
http://www.ebay.com/itm/INTEL-P2107C-General-Purpose-Dynamic-RAM-Single-chip-enable-Plastic-Vintage-/180865977014?pt=LH_DefaultDomain_0&hash=item2a1c73cab6