[Àû¿ë´ë»ó: DOSBox-x]

if nonzero, REP string instructions (LODS/MOVS/STOS/INS/OUTS) are interruptible (by interrupts or other events).

if zero, REP string instructions are carried out in full before processing events and interrupts.

Set to -1 for a reasonable default setting based on cpu type and other configuration.

A setting of 0 can improve emulation speed at the expense of emulation accuracy.

A nonzero setting (1-8) may be needed for DOS games and demos that use the IRQ 0 interrupt to play digitized samples
while doing VGA palette animation at the same time (use case of REP OUTS), where the non-interruptible version
would cause an audible drop in audio pitch.