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8E78: Print Handler: Print At X
PRINT AT first parameter handler. Called on the byte immediately following a 16 (PRINT AT) control code. Stores the X (column) parameter to 8001 and installs PrintHandler_PrintAt_Y into PrintState_Handler to handle the next byte (the Y position).
PrintHandler_PrintAt_X 8E78 LD ($8001),A Write the X column parameter to *PrintState_X.
8E7B LD HL,$8E82 Write PrintHandler_PrintAt_Y (Y position parameter handler) to PrintState_Handler to consume the next (Y) byte.
8E7E LD ($800A),HL
8E81 RET Return.
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