84PCE:Syscalls:021D80

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Synopsis

Hypothesized Official Name: SignExtendHL

Syscall Address: 021D80h

This was originally a broken call, and still is in OS 5.0.0.0089 (and others, perchance?) But after sending in information, TI did an amazing job and fixed this call. It basically performs a sign extension on a 16bit HL to 24bit HL.

Inputs

HL - 16-bit signed value

Outputs

HL - 24-bit signed value

Destroys

  • HLU