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Help identifying this 30 pin SIMM memory module

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Pepinno

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Apr 16, 2007
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Hello all.

I would like some help identifying this 30-pin SIMM memory module. It is intended to work in a 486-type computer, but I would like to know the memory capacity of this module.

The module has two chips, and on each chip it is written: "NEC Japan D424400GS-70L-9KD 9345M9209".

A picture:
 
1M x 4 = 4 mbits
2 ICs x 4 mbits = 8 mbits == 1 MByte each SIMM

As there is not a third IC, these SIMMs don't have parity.
 
nestor said:
1M x 4 = 4 mbits
2 ICs x 4 mbits = 8 mbits == 1 MByte each SIMM

As there is not a third IC, these SIMMs don't have parity.
Click to expand...

Alright, thanks a lot.

And how did you find out the first data "1M x 4"? Do you have a NEC book of specifications?
 
Another great way of determining the size of single RAM chips is to count the number of pins. 4 sets of 5 pins is typically* 1Mx4, while 4 sets of 6 pins is more or less always 4Mx4.

(* it can also be 4Mx1, 1Mx1, 256Kx4 or 256Kx1 but you can often see by the IC configuration or chip-ID what's the case. On many 30-pin and problably almost all 72-pin SIMM modules it's 1Mx4.)
 
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