Routines 
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The address of this routine is found in the table of addresses. It is called indirectly via fp_calc_2.
This subroutine performs the binary operation 'A$+B$'. The parameters for these strings are fetched and the total length found. Sufficient room to hold both the strings is made available in the work space and the strings are copied over. The result of this subroutine is therefore to produce a temporary variable A$+B$ that resides in the work space.


strs_add  359C  CALL STK_FETCH  The parameters of the second string are fetched and saved.  
359F  PUSH DE  
35A0  PUSH BC  
35A1  CALL STK_FETCH  The parameters of the first string are fetched.  
35A4  POP HL  The lengths are now in HL and BC.  
35A5  PUSH HL  
35A6  PUSH DE  The parameters of the first string are saved.  
35A7  PUSH BC  
35A8  ADD HL,BC  The total length of the two strings is calculated and passed to BC.  
35A9  LD B,H  
35AA  LD C,L  
35AB  RST $30  Sufficient room is made available.  
35AC  CALL STK_STO  The parameters of the new string are passed to the calculator stack.  
35AF  POP BC  The parameters of the first string are retrieved and the string copied to the work space as long as it is not a null string.  
35B0  POP HL  
35B1  LD A,B  
35B2  OR C  
35B3  JR Z,OTHER_STR  
35B5  LDIR  
OTHER_STR  35B7  POP BC  Exactly the same procedure is followed for the second string thereby giving 'A$+B$'.  
35B8  POP HL  
35B9  LD A,B  
35BA  OR C  
35BB  JR Z,STK_PNTRS  
35BD  LDIR  
This routine continues into STK_PNTRS.

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