83Plus:BCALLs:516D

Synopsis

Unofficial Name: IsOneTwoThree

BCALL Address: 516D

Minimum OS Version: 2.30

Checks whether OP1 is the floating point value 1, 2, or 3.

Inputs

• OP1: floating point number to check

Outputs

• OP1=1: 0,(iy+3Fh) and 1,(iy+3Fh) reset
• OP1=2: 0,(iy+3Fh) set and 1,(iy+3Fh) reset
• OP1=3: 0,(iy+3Fh) and 1,(iy+3Fh) set

Registers Destroyed

• A
• OP1, OP2

Comments

This BCALL will throw ERR:DOMAIN if OP1 is not 1, 2, or 3.

This is probably the source of the 84+/SE BASIC setDtFmt( function.