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Author Topic: is this ZIP RAM?  (Read 2017 times)

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Offline Zac67

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Re: is this ZIP RAM?
« on: May 05, 2008, 06:13:22 PM »
That's (probably) ZIP packaged VRAM - you'll need ZIP packaged DRAM of the 4x256K or 4x1M flavor.
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Offline Zac67

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Re: is this ZIP RAM?
« Reply #1 on: May 05, 2008, 09:27:50 PM »
I'm not entirely sure this is DRAM - the lengthy package looks strange.
Can't find any decent details on the GD5422 though, only it's 32 bit memory interface and 1 MB max - 4x256K chips for sure.
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Offline Zac67

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Re: is this ZIP RAM?
« Reply #2 on: May 06, 2008, 07:23:34 AM »
8x 4x256K = 32x256K == 8x1M  ;-)
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Offline Zac67

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Re: is this ZIP RAM?
« Reply #3 on: May 07, 2008, 07:35:25 AM »
Sigh...

1 chip is 4 bit x 256K.
2 chips in parallel are 8 bit x 256K = 256KB.
8 chips are 4x2 chips, so either 8x (4x256K) or - one this card - (8x4)x256K - same amount of memory: 1M bytes or 256K 32bit words.
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Offline Zac67

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Re: is this ZIP RAM?
« Reply #4 on: May 07, 2008, 06:34:32 PM »
Well, I told you it's VRAM... ;-)
(hey, my middle name is 'smart ass' :-D)
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