[Coco] CoCo 2 64K upgrade blues

Barry Nelson barry.nelson at amobiledevice.com
Sun Aug 6 10:49:21 EDT 2017


Why would tying the pin to ground be any better than tying it high to VCC? I would say leave it tied to VCC as it is simpler and will work just as well. The only difference is which bytes in the chip end up getting used.

> Dave Philipsen dave at davebiz.comĀ  <mailto:coco%40maltedmedia.com?Subject=Re%3A%20%5BCoco%5D%20CoCo%202%2064K%20upgrade%20blues&In-Reply-To=%3C26a6bdec-924b-6acc-c150-196cc8be47ea%40davebiz.com%3E>
> Sat Aug 5 15:14:08 EDT 2017
> So now that you have given more specific information about pin 1 it is 
> easy to see that you should pull/bend pin 1 so that it resides outside 
> of the socket.  And the best would be to tie pin 1 of each chip to pin 
> 16 (which is ground) of that chip. It would technically be better than 
> tying all of the pins together and then to ground although that would 
> probably work too.  The idea of avoiding sporadic reads or writes is a 
> valid one but still has nothing to do with whether the computer is 
> 'used' or not.  Maybe I am misinterpreting your use of the word 'used'.
> 
> Leaving pin 1 in the socket (and therefore tied to Vcc) is probably ok 
> too but the preferred method is as mentioned above.
> 
> Dave



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