The CL5422 (your Cirrus Logic chip) is a standard Cirrus Logic SVGA chip. 
Its on the low end, but if I remember correctly it can do 1024x768x16 (or 
256?)

I hope this helps and isn't misleading. Enjoy?

-Jon
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**

On Fri, 12 Apr 1996, Chris G Demetriou wrote:

> Hi folks...  Perhaps somebody here can help me out with this...
> 
> I'm looking for information on the DEC video board known as
> the "PowerStorm 3D30," a.k.a. the PBXGB-AA, a.k.a. the "ZLX2-E1".
> 
> Digital UNIX treats it as a TGA, but it doesn't seem to behave quite
> like either a dc21030 or a dc21130.  (It appears to behave more like a
> 21130...)
> 
> It has Digital's PCI vendor ID (0x1011), and a product ID of 0xd,
> which matches neither the 21030 (product ID 0x4) or the 21130 (product
> ID 0xc).  It has a PCI 'revision' field of 0x22.  It appears to be a
> combination VGA and 2-D accelerator, and shows up as a PCI VGA device.
> 
> 
> Looking at the board, it has the following "big chips" on it:
> 
> 	Cirrus chip (video?) with markings:
> 
> 		Cirrus Logic
> 		CL-GD5422-80QC-D
> 		35318-302E
> 		9502 N
> 		MALAYSIA-A
> 
> 	IBM chip (bus interface?) with markings:
> 
> 		IBM
> 		P3900187
> 		21-43826-01
> 		26H3574
> 		BTVBR09540
> 
> 	Bt485A RAMDAC
> 
> 
> Anybody?
> 
> 
> 
> cgd
>