is this ZIP RAM?

[orange]

I found an old GFX card and noticed it has chips that look like ZIP RAM but are longer. Can they be used somehow as ZIP inside for eg. Alpha Power?

[Plaz]

They are zip packages, but unless they are pin for pin matches to the card you want to use them in, they's no way they will works without something like an adapter.

Plaz

[Zac67]

That's (probably) ZIP packaged VRAM - you'll need ZIP packaged DRAM of the 4x256K or 4x1M flavor.

[CLS2086]

As it is a nice an old Cirrus, it may be DRAM.
But watch out the references !!
If you plain to get one day a bridgeboard, keep the card ;-)

[rkauer]

 What exactly is the ZIP chips name? With the "name" (code) we can dig the chip type.

[Zac67]

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.

[rkauer]

Zac67 wrote:
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.

 To achieve 1Mb you need 8 chips! 4bits x 256kb = 128kb.

[Zac67]

8x 4x256K = 32x256K == 8x1M  ;-)

[countzero]

the ram in the pic is 28 pin if I counted right. alfa data and most amiga stuff uses 20 pin ram AFAIR.

[rkauer]

Zac67 wrote:
8x 4x256K = 32x256K == 8x1M  ;-)

 Nope.

 8x 1/2byte (4bit) x 256k (1/4 Mb) == 1Mb

[Zac67]

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.

[orange]

the chips have 28 pins
here is whats written on them:
D42274V-12

[Zac67]

Well, I told you it's VRAM... ;-)
(hey, my middle name is 'smart ass' :-D)