Picture of the mobo socket and the existing ram plz.

An image of manual.

Thank you

You could probably move over some SOJ type Fast page 256Kx16 dram.
From an old soundcard, most of the time they get paired in two since one chip has a 16 bit path, and most chips use at least a 32bit path to the ram.
It is strange the the Cirrus uses only one 16bit chip, performance must be very low on such card with only 16bit data width.

Try to move some of those rams , to buy new one could be expensive, in that case we need to know the maker and type / model to match it up.
Although a match is not exactly needed.

In my case I had 2 un-populated Cirrus Logic 5429 ram sockets on my 486 board. With patience I sourced a CL PCI video card on eBay for under $10 that had unsoldered ram sockets that were filled. I transferred these chips to the mobo bringing it up to a max 2mb VRAM - very satisfactory for old 486 needs, and 1mb is probably enough for a lot of stuff as well.

Good Hunting!

Thank you all for your help.

I'll get a Cirrus logic and try to extract their memory modules.

Thank you

It's not that hard - look at the pictures on eBay and make sure the memory is sockets.

In case it's ever useful to anybody, I looked at my old CL-GD5426 video card with 1MB.

It has 2 of these RAM chips soldered:
MT4c16257DJ -7

These are 512KB capacity, 16-bit wide Micron Fast Page DRAM chips with 70ns access time. I don't know if they are in parallel on a 32-bit bus, or if they're at different addresses on a 16-bit bus.
"DJ" is the package type, which in this case is "Plastic SOJ 400 mil". "TG" would be "TSOP 400mil", and "Z" would be "Plastic ZIP 475 mil".

This is on a Reveal brand ISA card. Things might be different on other cards and boards though.