256k Banked Minimem.zip (size includes ROM)
480k Banked Minimem.zip (size discludes ROM)

so...

256k image is actually... 32 PAGES
128k = >40000 = 131072 bytes RAM

480k image is actually... 123 PAGES
480k = >7B000 = 503808 bytes RAM

source description here:
https://atariage.com/forums/topic/298380-using-8k-512k-mimi-memory-with-paging-on-finalgrom-99/