Stupid 18C question

[Lithium]

Thank you all for answers. I was considering for years buying the manual set, but I'm still hoping for a downloadable set

It seems the 18C is even more memory challenged than the 28C, what a pity. 1200 bytes will take you to what, 2-3 equations, one or two lists of ~10 items (I'm used to store file number in my calc for my work, they are 8 digit long).
I just checked my 17BII backup which gets virtually no use, and I'm using 921 bytes just with a few equations...

I've read somewhere there's a way to increase memory on a 28C, so maybe on a 18C too? But if I open my 18C, that will be to put a 19B motherboard in it!