DTK Computers Technical Information Sheet for PTI-223C S=shorted, O=open DIP switch 1=on 0=off J1:IRQ Control J6:Monitor Detection Control 1-2 S Enable use of IRQ9 1-2 S Standard Monitor 2-3 S Disable use of IRQ9 2-3 S Non-standard Monitor SW3:Scan Rate J2:Bus Detection O 48.7Khz O Autodetect S Default Scan Rate S Disable Autodetect