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1512: pause_3s: Pause for 3 seconds
Used by the routines at downloader_not_present and display_error.
pause_3s 1512 PUSH BC Preserve B.
1513 EI Enable interrupts.
1514 LD B,$96 Set B to 150 as loop counter.
pause_3s_0 1516 HALT Halt until next interrupt and loop.
1517 DJNZ pause_3s_0
1519 DI Disable interrupts, restore value of B, and return.
151A POP BC
151B RET
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