[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: More info A curious small circuit baord from a "]["?
greg@apple2.com wrote:
>
> In article <38966FD9.CE4156EC@ripco.com>,
> Jonathan Schattke <wizwom@ripco.com> wrote:
> >Bart wrote:
>
> >> I am curious: if one pulled the 64k RAM on the motherboard, and
> >> replaced with 256k can it be addressed or is that a waste of time?
>
> > Nope, it's a waste of time. The hardware would not be able to access
> > any more RAM.
>
> Would it be a suitable replacement for when the correct RAM chips go bad
> and the proper chips can no longer be obtained? If it can only access a
> portion of the RAM, can it still access that portion reliably? Provided
> suitable pinouts or adapters?
Yes, the 64K DRAM used 8 Rows and 8 collumns, the 256K used 9 of each. The
extra address line should be grounded, then it will work fine.
--
\ /\ / If you aren't happy,
VVizVVom - Wandering Kernel of Happiness it's not my fault.
~~~> homepage at http://pages.ripco.net/~wizwom/ <~~~