Re: RamWorks III chips

[spector@vax2.concordia.ca (Mitchell Spector)]

In article Spaceman_Spiff@ocean-side.ecore.fnet.org writes...
> 
>Glenn,
>I think the reason that your card failed the ram test is you have different
>speed ram chips mixed together.  -10 = 100nSec, -15 = 150nSec and -12 =
>120nSec.  It's not a good idea to mix different speed ram chips in the same
>bank.  I suggest that you find and replace the ram chips that and not the same
>speed.  If you need any more help let me know!

	As far I as know, mixing different speed DRAM chips shouldn't cause
a problem. So long as none of those DRAMs are slower than what is required 
by the machine their used on (ie, 150 nanoseconds or faster is required by
the IIgs). Back when I used the Apple 1MB card inside my IIgs, I had a real 
salad-mix of brands and speeds of DRAMs on my card -- 150ns and 120ns mostly.
Currently I'm mixing 100ns DRAMs (from my Sequential RAM-GS card) with 120ns
DRAMs soldered-in on my ROM 3 motherboard. I've never had problems with any
of my Apple II systems using mixed speed DRAMs. 

	Of course the CAS-before-RAS memory addressing comes into play,
if you use different type DRAMs on an Apple II you'll have problems.
Hmmm, speaking of which, do SIMM RAMs follow simular memory refresh 
technics? I was thinking of extracting some 1MB SIMMs from a dead 
Macintosh Plus and installing them in my second GS, but will they
work correctly inside a IIgs? (The speed and parity-bit should be
fine, but what about the refresh?).

Mitchell Spector
m_spect@vega.concordia.ca / spector@vax2.concordia.ca