Strange DIMM's..

  • Thread starter Thread starter Bob Vaughan
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Bob Vaughan

I've got a pair of 168pin DIMMS that I found in my junkbox..

They look normal, except that the two alignment slots are offset ~1mm
further towards one end than normal DIMM's..

the alignment holes at the ends, and the pins all line up, it's only
the slots that are offset.

they both have 8 toshiba TC5118160AJ-70 chips, and 2 16244CTPV chips
(unknown manufacturer.. logo is a elongated S +lowercase dt)

a stick-on label on the DIMM's themselves that says Pointronics, and a
silkscreened 105218 A are the only markings.

Any clue what these are, and what they are for? They don't seem to fit
into anything that I can find..
 
I've got a pair of 168pin DIMMS that I found in my junkbox..

They look normal, except that the two alignment slots are offset ~1mm
further towards one end than normal DIMM's..

the alignment holes at the ends, and the pins all line up, it's only
the slots that are offset.

they both have 8 toshiba TC5118160AJ-70 chips, and 2 16244CTPV chips
(unknown manufacturer.. logo is a elongated S +lowercase dt)

a stick-on label on the DIMM's themselves that says Pointronics, and a
silkscreened 105218 A are the only markings.

Any clue what these are, and what they are for? They don't seem to fit
into anything that I can find..
Click to expand...

Different voltages. See:

http://www.e-tec.ch/v2/IC_Products/IC_DR1-v84_030611.pdf
 
I've got a pair of 168pin DIMMS that I found in my junkbox..

They look normal, except that the two alignment slots are offset ~1mm
further towards one end than normal DIMM's..

the alignment holes at the ends, and the pins all line up, it's only
the slots that are offset.

they both have 8 toshiba TC5118160AJ-70 chips, and 2 16244CTPV chips
(unknown manufacturer.. logo is a elongated S +lowercase dt)

a stick-on label on the DIMM's themselves that says Pointronics, and a
silkscreened 105218 A are the only markings.

Any clue what these are, and what they are for? They don't seem to fit
into anything that I can find..
Click to expand...

The change in alignment for one of the slots designates 5V vs 3.3V. I
think the other slot position indicates FPM/EDO vs. SDRAM, but i am less
certain about the latter.

The original Macintosh PCI models used 5V FPM (or EDO) buffered (the 16244
chip) DIMMs. I think some IBM RISC machines used them as well.
 
I've got a pair of 168pin DIMMS that I found in my junkbox..

They look normal, except that the two alignment slots are offset ~1mm
further towards one end than normal DIMM's..

the alignment holes at the ends, and the pins all line up, it's only
the slots that are offset.

they both have 8 toshiba TC5118160AJ-70 chips, and 2 16244CTPV chips
(unknown manufacturer.. logo is a elongated S +lowercase dt)
Click to expand...

Integrated Device Technology
http://www.idt.com/

The IDT54/74FCT16244T/AT/CT is a "FAST CMOS 16-BIT BUFFER/LINE
DRIVER".
a stick-on label on the DIMM's themselves that says Pointronics, and a
silkscreened 105218 A are the only markings.

Any clue what these are, and what they are for? They don't seem to fit
into anything that I can find..
Click to expand...


- Franc Zabkar
 
The change in alignment for one of the slots designates 5V vs 3.3V. I
think the other slot position indicates FPM/EDO vs. SDRAM, but i am less
certain about the latter.

The original Macintosh PCI models used 5V FPM (or EDO) buffered (the 16244
chip) DIMMs. I think some IBM RISC machines used them as well.
Click to expand...

Ok.. that helps.. I now have an idea where they came from...

Thanks for all the responses..
 
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