44 is the CP Map in the below script
To get start_sav:
WRITE:
44 A1 01 ;
44 BB 00;
44 BC A0;
READ:
44 FC
44 FD
To get start_eav:
WRITE:
44 A1 01 ;
44 BB 00;
44 BC B0;
READ:
44 FC
44 FD
0xFC[4:0] contain the most significant bits of the value
0xFD[7:0] contain the least significant bits of the value
When you adjust the position of EAV/SAV/DE with the registers based on relative changes these are the starting points.