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, 0 for '+' and 255 for ''.


STACK_BC  11563  LD IY,23610  Reinitialise IY to ERRNR.  
11567  XOR A  Clear the A register.  
11568  LD E,A  And the E register, to indicate '+'.  
11569  LD D,C  Copy the less significant byte to D.  
11570  LD C,B  And the more significant byte to C.  
11571  LD B,A  Clear the B register.  
11572  CALL STK_STORE  Now stack the number.  
11575  RST 40  Use the calculator to make HL point to STKEND5.  
11576  DEFB 56  end_calc  
11577  AND A  Clear the carry flag.  
11578  RET  Finished. 
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