Re: D2164A-20

From: Gerrit Heitsch <*gerrit_at_laosinh.s.bawue.de*> Date: Fri, 16 Dec 2016 17:59:16 +0100 Message-ID: <80c563ee-1d32-c1ca-3565-52be8e92f90a@laosinh.s.bawue.de> · gerrit_at_laosinh.s.bawue.de

On 12/16/2016 12:12 AM, Terry Raymond wrote:
> Hi all,
>
> I found out my C128 does have D2164A-20 DRAM
>
> The previous owner installed it, terrible desoldering, terrible
> soldering, so I'm having to clean it up,
> Carefully. As far as desoldering older RAM chips!
>
> One wire came off so in moving it the other one did, is it pin4 that is
> grounded?

No... Here's the pinout of a 4164:

         _____
     NC [o V  ] GND
    Din [     ] /CAS
    /WE [     ] Dout
   /RAS [     ] A6
     A0 [     ] A3
     A2 [     ] A4
     A1 [     ] A5
    Vcc [_____] A7

The 'V' is the notch in the package and the 'o' is the mark for pin 1 
that some of them have.

To help count: NC = pin1, GND = pin16, Vcc=pin8, A7=pin9

   Gerrit

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