Elmo HARSFEN0602, HARmonica software manual Getcomm Get Command, JMP Jump

HARSFEN0602ElmoHARmonicaSoftwareManual				PRELIMINARYDRAFT
DataSeg + Op1		Arr (array address)
(SP) Ind	(array index)
Arr[Ind]	(SP) (return value)
Attributes
Attribute			Value	Comment
Op code				May change in future
				versions
Number of arguments			1
		→
Argument type			Signed short integer
Addressing modes			Mem_Direct	Location of variable (index)
→→				in the variable symbol table.
				Address of array variable is
				taken from the table.
				Array index is at top of stack.
Promotion			N.A.
Output type			Argument Type1	Value from array is pushed at
				the top of stack instead of
				array index
Imposes end of line			No

79

7.7.10GET_COMM – Get Command

Purpose:
Call to function service of a ‘get’ command.
Algorithm:
FuncTable	(list of functions handlers)

	→	(SP)	(put return value at top of stack)
FuncTable[Op1]()
SP SP +1
Attributes
Attribute				Value	Comment
Op code					May change in future
					versions
Number of arguments				1
Argument types				Unsigned char integer
Addressing modes		→		Immediate1	Index of service function in
→					function table.
					If system parameter is an
					array , array index is at top of
					stack .
Promotion				N.A.
Output type				N.A.	Output argument is at top of
					stack.
					Type set according to service
					function .
Imposes end of line				No

7.7.11JMP – Jump

Purpose:

Jump to another location in the program.

Algorithm: