Routines
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26359: Convert Screen Address To Attribute Buffer Address
Used by the routines at Configurable_PrintString, Handler_PlayerBullets, ClearSpriteArea, Handler_Pheenix_01, Handler_AliensMovement_Spawning and Handler_Aliens.
Input
DE Screen buffer address
Output
DE Attribute buffer address
ConvertScreenToAttributeBufferAddress 26359 LD A,D Extract bits 3-4 from D (the character row within the display file third).
26360 AND %00011000
26362 SRA A Shift the result right three positions (divide by 8) to get the attribute row offset.
26364 SRA A
26366 SRA A
26368 ADD A,88 Add 88 to convert to the attribute buffer address range (22528-23295).
26370 LD D,A
26371 RET Return.
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