84PCE:Syscalls:021D50

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Synopsis

Hypothesized Official Name: ChkHLIs0

Syscall Address: 021D50h

Checks if the 24-bit value in HL is 0.

Inputs

  • HL: value

Outputs

  • Z flag set if HL == 0
  • A holds upper byte of HL

Destroys

  • AF
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