29 Sep
2005
29 Sep
'05
2:01 p.m.
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:
Anyone have a datasheet for Hitachi HM511000AJP8 DRAMs? It's used in at
least some IIfx SIMMS.
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