🚀 go-pugleaf

pgrb <pgrb@ygdrasil.demon.co.uk> wrote:

> I am running a Centris 610 with 12 Mbyte RAM, and now is the time to
> upgrade as Netscape apparently wants 16Mb in its new(ish) incarnation, and
> MacOS 8 requires 8 Mb.

RAM Doubler might be an idea *as well as* more RAM.  (20MB real RAM RAM
Doubled to 40 MB seems to work well on my Performa 475).

[snip]

> 60ns SIMMs are ubiquitous and extremely price competitive - so any
> problems using them?

Not that I know of - the SIMMs need to be fast enough and that's it.
Faster than the minimum speed doesn't harm anything that I know of (it
might even help a little bit by reducing chance of problems caused by
logic line loading which might slow things down - if the SIMMs are
faster than needed, this should be less likely to happen.   Not that it
should be a problem in the first place or anything like that.)

> Finally, I believe that whatever SIMM is used, it requires a 2kHz refresh
> rate - are there any manufactured that aren't?

Haven't a clue.

> Finally, finally - does anyone know if the Centris senses SIMM speed (I
> think using presence line which have comninations of resistors on the SIMM
> to indicate it's speed to the hardware).

No idea.

> And finally finally finally - any experience of using Mac Supplies or
> Discs Direct, both of whom seem to have competitive SIMM prices.

I have no experience of Discs Direct.  I have experience of buying from
Mac Supplies - an external HDD.  They took the money off the credit card
twice, refused to consider that they'd made a mistake and refused to
look into it.  The credit card firm eventually got it back, but that
took 10 weeks.  I would go near Mac Supplies again, but only to plant a
small nuclear bomb in the warehouse (not covered by insurance, you see).

[snip]

> P.S. above questions also apply to VRAM - the Centris 610 specifies 100ns
> VRAM, other Macs 80ns.

AFAIK, the same applies - you shouldn't have any trouble with faster
VRAM.

Rowland.


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