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Old 01-24-2007, 05:29 AM   #1
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Default A4000 chipmem speed: 70ns? 80ns? or 100ns???
I got some replacement 2MB memory sticks for my A4000D, and they are rated 80ns. the original one on my 4000 is 70ns, I was wondering what is the real speed of A4000 chipmem... most likely 80ns right? or slower? :-?
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Old 01-24-2007, 06:03 AM   #2
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
Yeah you know it's slow....
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Old 01-24-2007, 06:09 AM   #3
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
yes, but how many ms ???
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Old 01-24-2007, 06:13 AM   #4
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
80ns on mine (originally) swapped then with a 70 ns one.

At least on my A4000/030 the 80ns was the default one.

PS- just checked the manual... =/< 80ns
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Old 01-24-2007, 06:48 AM   #5
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
I would imagine that Chip RAM requires a period of no less than 140ns. Why? It has a clock rate of 7.14MHz

Hmm... maybe it has a clock rate of 14.28MHz with AGA?

Note: using slower chip-RAM you cannot use the "speedramsey" util.
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Old 01-24-2007, 07:06 AM   #6
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
speedramsey?
I thought this was only for the A4000T version...
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Old 01-24-2007, 03:52 PM   #7
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
I dont think so, but I am not 100% sure.

I thought that it was A3000(T) and A4000(T) all models
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Old 01-24-2007, 04:08 PM   #8
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
checked the docs again, works on any A4000 and on A3000 that have the rev.G ramsey... all A4000 have rev.G ramsey chips, according to the author.
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Old 01-24-2007, 07:07 PM   #9
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
Quote:
I would imagine that Chip RAM requires a period of no less than 140ns. Why? It has a clock rate of 7.14MHz
That's true for OCS/ECS. Actually it takes two cycles (~280ns) for a RAM access, one for RAS and one for CAS. AGA needs 80ns or better static-column DRAM so it can divide the 280ns into RAS+CAS+CAS, doing two reads in a row and doubling the bandwidth.
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Old 01-25-2007, 12:23 AM   #10
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Default Re: A4000 chipmem speed: 70ns? 80ns? or 100ns???
Static column on PS/2? Are you sure?
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