Tristate Buffer Output if Input is High-Z?

[Eric J Korpela]

I also notice that the table on page 2 of the technote contradicts the IIfx
section. The table says you can put up to 128MB in a IIfx, but the IIfx
section says the biggest SIMM allowed is 256kx8.

Eric

On 9/29/05, Eric J Korpela <korpela at ssl.berkeley.edu> wrote:
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> Anyone have a datasheet for Hitachi HM511000AJP8 DRAMs? It's used in at
> least some IIfx SIMMS.
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> What's the deal with parity on the IIfx? Is the parity bit stored off the
> SIMM? The technote http://developer.apple.com/technotes/hw/pdf/hw_25.pdfmentions parity, are there 9-chip SIMMS on the IIfx? Or is the parity stored
> on a separate RAM on the mainboard? Since your max memory is 8x(4Mx8bit bit
> SIMMS) accessed 32 bits at a time (I assume) you'd only need 1 Mbit of
> parity RAM if you do parity across 32 bits.)
>
> Eric
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