83Plus:BCALLs:80ED

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Synopsis

Unofficial Name: ControlCmdFailed

BCALL Address: 80ED

Checks for success/failure on a USB control request.

Inputs

  • None

Outputs

  • C set if NAK or Stall

Destroys

  • A

Comments

This BCALL outputs 0 to port 8Eh and checks bits 2 and 4 of port 91h. If either are set, this function returns carry set.

Example

B_CALL ControlCmdFailed
jr c,commandFailed
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