ncr/doc/Old Models/Technical Manuals/7453_... - Alsys Data

Chapter 4: Hardware Service 4-43Dual Port RS-232 Board (Old Style)The Dual Port RS-232 Board provides two additional industry standardRS-232 ports. The board occupies an ISA slot and requires two IRQsand a corresponding I/O address space. COM port assignments aremade by way of hardware jumpers on the board.IRQJP1*JP2* JP1 is not usedJP3AddressJP4JP5COMACOMBNote: The settings shown aboveand below are the default settings.These settings would strapCOMA as COM4 , and COMB as COM3 .JP6The following chart is meant to show you how to interpret the possible strapping options using the defaultsettings as examples . When setting the IRQ for COM A, use the three left columns of pins (JP2). Whensetting the IRQ for COM B, use the three right columns of pins (JP3). Notice that the higher IRQ numbersare different for COM A and COM B. When setting the address for COM A or COM B, connect one end ofthe strap to the COM A or COM B column and the other side to the pin for the address you want to use.To disable either com port, do not install any straps for that port.IRQ9IRQ11IRQ12COM A at IRQ 9 Addresses COM B at IRQ 5COMAJP2COMBIRQ3IRQ4IRQ5378278COMACOMB3F82F83E82E8IRQ3IRQ4IRQ5COMACOMBJP3IRQ11IRQ12IRQ15JP4 JP5 JP615485