Difference between revisions of "83Plus:BCALLs:42F1"
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=== Outputs === | === Outputs === | ||
* HL = VAT pointer | * HL = VAT pointer | ||
| − | * DE = Data location ( | + | * DE = Data location (if in archive, will be address when page is put into [[83Plus:Ports:06|bank A]]) |
* B = Flash Page, or 0 if in RAM | * B = Flash Page, or 0 if in RAM | ||
* C = Length of Variable Name | * C = Length of Variable Name | ||
Revision as of 15:15, 19 August 2007
Synopsis
Official Name: ChkFindSym
BCALL Address: 42F1
Recalls various pointers and information for a symbol in the VAT.
Inputs
- OP1 = Name of variable (with proper initial defining byte, see example)
Outputs
- HL = VAT pointer
- DE = Data location (if in archive, will be address when page is put into bank A)
- B = Flash Page, or 0 if in RAM
- C = Length of Variable Name
- A = 'unknown'
- carry flag is set if the variable is not found in the VAT
Registers Destroyed
'All'
Example
ld hl,varname B_CALL Mov9toOp1 B_CALL ChkFindSym jr c,notfound ;carry flag is set if the VAT entry is not found ex de,hl ;put data pointer into hl xor a cp b ;see if b is 0, and the program is in the ram jr z,unarchived ;if so, jump to unarchived ;do something to get it into RAM unarchived: ;do something once it is in RAM varName: .db AppVarObj, "APPVAR",0
