4164-20

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4164-20

traymond

Hi Todd George and all,
Thanks for the URL's for finding older IC's etc.

I found a few different 4164's and the fastest is 4164-20 would this function in a C128?

I'm not up to altering the 41256.

Terry Raymond

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Re: 4164-20

Gerrit Heitsch
On 12/09/2016 02:45 AM, Terry Raymond wrote:
> Hi Todd George and all,
> Thanks for the URL's for finding older IC's etc.
>
> I found a few different 4164's and the fastest is 4164-20 would this
> function in a C128?

The fastest? The 4164-20 are the slowest 4164 I have seen so far... They
should work, but make sure you don't get MT4264 though, those are known
to not age well.


> I'm not up to altering the 41256.

I usually just connect pin 1 to pin 16 (which is GND).

  Gerrit



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Re: 4164-20

Mike Stein

----- Original Message -----
From: "Gerrit Heitsch" <[hidden email]>
To: <[hidden email]>
Sent: Saturday, December 10, 2016 12:03 PM
Subject: Re: 4164-20


> On 12/09/2016 02:45 AM, Terry Raymond wrote:
>> Hi Todd George and all,
>> Thanks for the URL's for finding older IC's etc.
>>
>> I found a few different 4164's and the fastest is 4164-20 would this
>> function in a C128?
>
> The fastest? The 4164-20 are the slowest 4164 I have seen so far...

> ... Gerrit
=======================================
Indeed; as a rule the higher the suffix the slower the chip.

Here's a useful reference:

http://www.minuszerodegrees.net/memory/4116.htm

http://www.minuszerodegrees.net/memory/4164.htm

http://www.minuszerodegrees.net/memory/41256.htm

m

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Re: 4164-20

geneb
In reply to this post by Gerrit Heitsch
On Sat, 10 Dec 2016, Gerrit Heitsch wrote:

> On 12/09/2016 02:45 AM, Terry Raymond wrote:
>> Hi Todd George and all,
>> Thanks for the URL's for finding older IC's etc.
>>
>> I found a few different 4164's and the fastest is 4164-20 would this
>> function in a C128?
>
> The fastest? The 4164-20 are the slowest 4164 I have seen so far... They
> should work, but make sure you don't get MT4264 though, those are known to
> not age well.

The go-to source for stuff like this is Unicorn Electronics.
http://www.unicornelectronics.com/IC/DYNAMIC.html

g.

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Re: 4164-20

Gerrit Heitsch
On 12/10/2016 07:12 PM, geneb wrote:

> On Sat, 10 Dec 2016, Gerrit Heitsch wrote:
>
>> On 12/09/2016 02:45 AM, Terry Raymond wrote:
>>> Hi Todd George and all,
>>> Thanks for the URL's for finding older IC's etc.
>>>
>>> I found a few different 4164's and the fastest is 4164-20 would this
>>> function in a C128?
>>
>> The fastest? The 4164-20 are the slowest 4164 I have seen so far...
>> They should work, but make sure you don't get MT4264 though, those are
>> known to not age well.
>
> The go-to source for stuff like this is Unicorn Electronics.
> http://www.unicornelectronics.com/IC/DYNAMIC.html

If you're in Germany, get 101 047 from www.pollin.de. That's a NOS
GM71256-12 (41256), sells for 40 Cents and will work in a C64 if you
connect Pin 1 to Pin 16. There is no reason why it shouldn't work in a
C128 or any other system that uses 4164, as long as the DRAM controller
supplies an 8Bit refresh (VIC and TED do).


  Gerrit



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