CHR Compression for repro cart

This is an archive of a topic from NESdev BBS, taken in mid-October 2019 before a server upgrade.
View original topic
CHR Compression for repro cart
by marvelus10 on 2009-04-01 (#45044)
Is this even possible,

I want to know if 256K of CHR can be compressed to fit into a 128K eprom chip.

If so please point me in the right direction.

thanx eh

by nintendo2600 on 2009-04-01 (#45045)
not possible (at least I've never heard of such a thing), just get a bigger eprom. If your programmer supports 1meg chips odds are it supports 2meg chips also.

by marvelus10 on 2009-04-01 (#45046)
I will have to order some chips then, I just didn't want to wait a week or so to get them if I didn't have to.

Thank you for the reply.

by nintendo2600 on 2009-04-01 (#45047)
marvelus10 wrote:
I will have to order some chips then, I just didn't want to wait a week or so to get them if I didn't have to.

Thank you for the reply.


I hear ya, waiting sucks. I want to make some smb2j carts and some ff3j carts right now myself but the largest chips I have are 1meg and I gotta wait to get some in the mail too so I feel your pain dude :)