Re: what variation of mk4096 4k rams work in an Apple II.

[Mike Willegal <mike@willegal.net>]

Mark,

	Your information helped me find some more information.  I found a 
mk4096 data sheet on the web and it shows:
mk4096(P/N)-6 = 250ns (access time)
mk4096(P/N)-16 = 300ns
mk4096(P/N)-11 = 350ns

P = plastic package
N = ceramic package

Something in the back of my brain says Apple II's need 300ns or less 
access time DRAM, but I wouldn't trust my memory from some many years 
ago.  Also what would a K package type be?

Any more thoughts on minimum access time for this design?

Regards,
Mike Willegal


Mark Frischknecht wrote:
> Mike Willegal wrote:
>
> > I found a online company (www.axiselectronics.com) that sells obsolete 
> > parts and it lists a number of different versions of MOSTEK MK4096. 
> > Anyone know which ones might work in an Apple II?  Here is some of the 
> > variations listed.
> >
> > MK4096K-11
> > MK4096N-11
> > MK4096N-15
> > MK4096K-15
> > MK4096N-16
> > MK4096P-17
> > MK4096N-18
> >
> > Regards,
> > Mike Willegal
>
> probably any of those -15 and under
>
> Most apple II ram chips were 150 ns and faster.
> -XX indicates the speed in Nano seconds.
>
> Mark Frischknecht