Routines 
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The routine at STACK_A continues here.
This subroutine gives the floatingpoint form for the absolute binary value currently held in the BC register pair.
The form used in this and hence in the two previous subroutines as well is the one reserved in the Spectrum for small integers n, where 65535<=n<=65535. The first and fifth bytes are zero; the third and fourth bytes are the less significant and more significant bytes of the 16 bit integer n in two's complement form (if n is negative, these two bytes hold 65536+n); and the second byte is a sign byte, +00 for '+' and +FF for ''.


STACK_BC  2D2B  LD IY,$5C3A  Reinitialise IY to ERRNR.  
2D2F  XOR A  Clear the A register.  
2D30  LD E,A  And the E register, to indicate '+'.  
2D31  LD D,C  Copy the less significant byte to D.  
2D32  LD C,B  And the more significant byte to C.  
2D33  LD B,A  Clear the B register.  
2D34  CALL STK_STORE  Now stack the number.  
2D37  RST $28  Use the calculator to make HL point to STKEND5.  
2D38  DEFB $38  end_calc  
2D39  AND A  Clear the carry flag.  
2D3A  RET  Finished. 
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