Connectors:

Speaker  CN1 
Turbo LED CN2 
Reset     CN3
Keylock   CN4

BIOS Config:     J1      J2
27C64/27C128   Open      Open
27C256         Open      Closed
27C512         Closed    Closed


Video Config   J3        J4
None          Closed     Closed
80x25 Colour  Closed     Open
40x25 Colour  Open       Closed
Mono/Colour   Open       Open

Memory Config:
Size   Bank 0    Bank 1    Bank 2      Bank 3 
256k   9*41256   None      None        None 
512k   9*41256   9*41256   None        None
576k   9*41256   9*41256 2*4464+1*4164 None
640k   9*41256   9*41256 2*4464+1*4164 2*4464+1*4164