rst rMov9ToOP1     ; rst 10h      ; D7      ;This copies the name at HL to OP1
     bcall(_ChkFindSym) ; bcall(42F1h) ; EFF142  ;Searches for the variable
     ret c              ;              ; D8      ;Exits if the variable was not found
     ld a,b             ;              ; 78      ;A is now the flash page
     or a               ;              ; B7      ;Test if A=0 (means in RAM)
     ret nz             ;              ; C0      ;Exit if the variable is in archive
     ex de,hl           ;              ; EB      ;Now HL points to the size bytes
     ld c,(hl)          ;              ; 4E      ;C is the LSB of the size of the var
     inc hl             ;              ; 23      ;HL points to the next sizebyte
     ld b,(hl)          ;              ; 46      ;Now B is the MSB, making BC the size of the variable
     inc hl             ;              ;         ;HL now points to the data
;Now you can edit the data and know if you are out of bounds. Also, if the data is less than 127 bytes (like for save data), you can do this:
     push hl
     pop ix
;Now IX points to the data, and if you want to read or write to a byte, you can do ld (ix+3),33h, for example.