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8576: May anything be printed? Z if not
Used by the routine at PRINT_CHAR.
Printing happens only while both DOING_IT (for real, not a test) and PRINTING_ON (printing on) are set.
PRINT_GATE 8576 PUSH HL
8577 LD L,A
8578 LD A,(DOING_IT)
857B LD H,A
857C LD A,(PRINTING_ON)
857F AND H
8580 LD A,L
8581 POP HL
8582 RET
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