Texas Instruments TI-83-Plus - List Element Routines; Manipulation Routines

Chapter 2: TI-83 Plus Specific Information 47
TI-83 Plus Developer Guide Third Release May 28, 2002
LD HL,MyAppVar
RST rMov9ToOP1 ; OP1 = AppVar name
B_CALL ChkFindSym ; find Symbol Table entry,
; and get pointers
;
; B = ROM page and DE = offset, to start of data in the archive
;
EX DE,HL ; B, HL now points to the
; data of the variable
CALL LoadCIndPaged_inc ; skip data valid flag
CALL LoadDEIndPaged_inc ; skip data length, B, HL
; at symbol entry
;
; now the size of the Symbol Table entry needs to be computed so that
; it can be skipped over to get to the AppVar’s data structure
;
LD DE,5 ; DE = offset to name
; length of AppVar
CALL BHL_plus_DE ; add DE to B, HL:
; page, offset
;
CALL LoadCIndPaged_inc ; C = name length, B, HL
; advanced
LD E,C ; DE = offset to start of
; AppVars data
;
CALL BHL_plus_DE ; add DE to B, HL: page,
; offset
;
CALL LoadDEIndPaged_inc ; DE = size bytes of
; AppVar,
RET
MyAppVar:
.asciz AppVarObj, ‘MYAPPVAR’
BHL_Plus_DE:
ADD HL,DE ; add DE to the offset HL
BIT 7,H ; cross page boundary?
RET Z ; no, B, HL = ROM page and
; offset
;
INC B ; increase ROM page number
RES 7,H
SET 6,H ; adjust offset to be in
; 4000h to 7FFFh
RET
Manipulation Routines
List Element Routines
These routines are used for storing and recalling list element values and for changing
the dimension of a list.
AdrLEle Returns the RAM address of a list element.