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Official Name: ConvOP1

BCALL Address: 4AEF

Converts a floating-point number in OP1 to a two-byte hexadecimal number in DE.


  • OP1 = Floating Point Number in standard TI-OS decimal format.


  • A = Least SIgnificant Byte Value
  • DE = Hex Value

Registers Destroyed

  • HL,BC


This information was supplemented by the Detached Solutions forum site. This routine is used to convert a floating-point number OP1 to a hex value in DE, but if the number in OP1 is greater than 9999, an error will occur. The same is thought to happen with decimal numbers; once discovered, more documentation will appear on this ROM call.