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Routines |
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Used by the routine at InitialiseDisplayBuffer.
Returns the object attribute when its bit 2 is clear, or when bit 0 of B16E is set. Returns zero when bit 1 of the attribute is set.
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| ReadObjectAttribute | B387 | LD A,($A01D) | Read the object attribute. | |
| B38A | BIT 2,A | See whether bit 2 of it is set. | ||
| B38C | RET Z | Return if that marker is clear. | ||
| B38D | LD HL,$B16E | Point at the display flag. | ||
| B390 | BIT 0,(HL) | See whether the display flag is set. | ||
| B392 | RET NZ | Return if that marker is set. | ||
| B393 | BIT 1,A | Jump ahead to ReadObjectAttribute_SignalStepFailed if bit 1 of the attribute is set. | ||
| B395 | JR NZ,ReadObjectAttribute_SignalStepFailed | |||
| B397 | OR %00000001 | Reset the zero flag. | ||
| B399 | RET | Return. | ||
| ReadObjectAttribute_SignalStepFailed | B39A | XOR A | Clear A. | |
| B39B | RET | Return. | ||
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View the equivalent code in;
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