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53479: Call time-dependent routines (main interrupt routine)
Used by the routine at 65524.
IY 23610
53479 CALL 54051 Store all registers on the stack
53482 BIT 0,(IY+65) If game-in-progress flag is reset...
53486 JP Z,53492 ...then skip ahead to 53492
53489 CALL 53498 Update game time, time left and move characters if appropriate
53492 CALL 54079 Restore all registers from the stack
53495 JP 56 Jump to ROM maskable interrupt routine (update frame counter, read keyboard and then return from interrupt routine)
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