/* DAR (decrement addressing register) */
        case 0x04:
        case 0x05:
        case 0x06:
        case 0x07:
            {
            int temp=regs[opcode[0]&0x3]+regs[8];
            if (temp<=0x7ff) regs[opcode[0]&0x3]=temp;
            else regs[opcode[0]&0x3]--;
            return EMU_SUCCESS;
            }