There are a few ways:
1. Zorro Memorycard. Pros/Cons: 8Mb cards are easy to get and doesn't cost much but is just that... 8Mb, getting a 128 or 256Mb (DKB3128 / FastLaneZ3) card though is both hard and expencive and that said any Zorro memory will be even slower than the one existing on the motherboard... and it takes up one of you're precious Zorroslots that can be put to better use.
2. X-Calibur addon for 3640. Pros/Cons: Allows for 128Mb memory and will speed up your computer quite a bit. Belive it's even compatible with the quaddobler you got. The problem however is that it's addons on addons on addons and more places to fail... And this card is virtually impossible to find so prise will be high if you do.
3. A CPU card witch takes memory. Pros/Cons: Usually allows for 128Mb memory and will speed things up, especialy if you go for a 060 card. Might not be the cheapest option but is by far the best one.
