IOR (0xB0)

The IOR instruction pops the top two elements from the stack, performs a bitwise OR on them, and pushes the result onto the stack.

Interpreter Microcode

The microinstructions are listed in the order in which they are executed; not the order in which they are stored in the control store.

0x0b0  SP=MAR=SP-1; rd; goto 0x9
...
0x009  H=TOS; goto 0xa
0x00a  TOS=MDR=H OR MDR; wr; goto 0x2

Example Program

//---------------------------------------------
// Demonstrate the IOR instruction.
//
// 1. Clear Memory
// 2. Assemble this program.
// 3. Reset the computer.
// 4. Click the "Display Words" radio button
//    below the memory display.
// 5. Click the "Run" button.
//
// After running this program
//     14 is stored at address 4097
// and the top of the stack is at 4097.
//---------------------------------------------
.main
    bipush  6  // Push 0110 onto the stack
    bipush 10  // Push 1010 onto the stack
    ior        // Replace top two values with
               // 0110 | 1010 = 1110 (decimal 14)
    halt
.end-main