Epson 386/25 - Manual (Page 117)

Jumper settings for base memory
512KB A B
256KB B B
* Factory settings
Jumper settings for extended memory
* Factory settings
(a) Configured using 256KB SlMMs in all banks
(b) Configured using four 1MB SlMMs in Bank 0
(c) Configured using eight 256KB SlMMs in banks 0 and 1 and
eight 1MB SlMMs in banks 2 and 3
(d) Configured using eight 1MB SlMMs in banks 0 and 1 and eight
256KB SlMMs in banks 2 and 3
Installing and Removing
Options 5-9