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The ICL 1900 PLAN Assembly language is a historical computer programming language, developed by International Computers Limited (ICL) in the late 1960s. It was specifically designed for the ICL 1900 series of computers, a popular business machine in the UK during that era. The PLAN (Programming Language for All Networks) was a symbolic assembly language, which allowed programmers to use mnemonic codes rather than numeric ones. This made it easier to write and understand programs. The design and implementation of ICL 1900 PLAN are documented in various technical reports and manuals published by ICL.

Ask the right questions secure the right ICL 1900 PLAN Assembly language. talent among an increasingly shrinking pool of talent.

First 20 minutes

General ICL 1900 PLAN Assembly language. app knowledge and experience

The first 20 minutes of the interview should seek to understand the candidate's general background in ICL 1900 PLAN Assembly language. application development, including their experience with various programming languages, databases, and their approach to designing scalable and maintainable systems.

Can you explain the basic structure of an ICL 1900 PLAN Assembly language program?

An ICL 1900 PLAN Assembly language program consists of three sections: the data section, the code section, and the stack section. The data section is where variables and constants are declared. The code section contains the program instructions. The stack section is used for dynamic memory.

What are the main data types in ICL 1900 PLAN Assembly language?

The main data types in ICL 1900 PLAN Assembly language are bytes, words, and double words. A byte is 8 bits, a word is 16 bits, and a double word is 32 bits.

How would you declare a variable in ICL 1900 PLAN Assembly language?

To declare a variable in ICL 1900 PLAN Assembly language, you would use the 'DS' directive followed by the variable type and name. For example, 'DS 1 VARNAME' would declare a byte variable named VARNAME.

What is the purpose of the 'ORG' directive in ICL 1900 PLAN Assembly language?

The 'ORG' directive is used to set the program counter to a specific address. This is useful for controlling the layout of the program in memory.

How would you perform a loop in ICL 1900 PLAN Assembly language?

To perform a loop in ICL 1900 PLAN Assembly language, you would use the 'JMP' instruction to jump back to the start of the loop. You would also need a condition to exit the loop, which would typically involve a 'CMP' instruction to compare a variable to a value, and a conditional jump instruction like 'JNE' to jump if the condition is not met.

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What you’re looking for early on

Does the candidate have a solid understanding of ICL 1900 PLAN Assembly language?

Has the candidate demonstrated problem-solving skills?

Is the candidate able to explain complex concepts in a simple, understandable way?

Does the candidate have experience with similar projects or roles?

Next 20 minutes

Specific ICL 1900 PLAN Assembly language. development questions

The next 20 minutes of the interview should focus on the candidate's expertise with specific backend frameworks, their understanding of RESTful APIs, and their experience in handling data storage and retrieval efficiently.

What is the difference between the 'JMP' and 'JNE' instructions in ICL 1900 PLAN Assembly language?

'JMP' is an unconditional jump instruction, it always jumps to the specified address. 'JNE', on the other hand, is a conditional jump instruction, it only jumps to the specified address if the previous 'CMP' instruction determined that two values were not equal.

How would you call a subroutine in ICL 1900 PLAN Assembly language?

To call a subroutine in ICL 1900 PLAN Assembly language, you would use the 'JSR' instruction followed by the address of the subroutine. The 'JSR' instruction pushes the return address onto the stack, then jumps to the subroutine address.

What is the purpose of the 'RTS' instruction in ICL 1900 PLAN Assembly language?

The 'RTS' instruction is used to return from a subroutine. It pops the return address off the stack, then jumps to that address.

How would you handle an array in ICL 1900 PLAN Assembly language?

To handle an array in ICL 1900 PLAN Assembly language, you would declare the array in the data section using the 'DS' directive, then use the 'LDA' instruction to load the address of the array into a register, and the 'ADD' instruction to add an offset to the address. You could then use the 'LD' instruction to load the value at the calculated address.

What is the difference between the 'LDA' and 'LD' instructions in ICL 1900 PLAN Assembly language?

'LDA' is used to load the address of a variable into a register, while 'LD' is used to load the value of a variable into a register.

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At this point, a skilled ICL 1900 PLAN Assembly language. engineer should demonstrate strong problem-solving abilities, proficiency in ICL 1900 PLAN Assembly language. programming language, and knowledge of software development methodologies. Red flags include lack of hands-on experience, inability to articulate complex concepts, or unfamiliarity with standard coding practices.

Digging deeper

Code questions

These will help you see the candidate's real-world development capabilities with ICL 1900 PLAN Assembly language..

What does the following ICL 1900 PLAN Assembly language code do?
START LX, 0
ADD LX, 1
JMP START
This code starts a loop at label 'START', loads the value at memory address 0 into the LX register, increments the value in the LX register by 1, and then jumps back to the start of the loop. It essentially creates an infinite loop, continuously incrementing the value in the LX register.
What will be the output of the following ICL 1900 PLAN Assembly language code?
START STO LX, 100
JZ END
SUB LX, 1
JMP START
END HLT
This code initializes the LX register with the value 100, then enters a loop where it subtracts 1 from the LX register until the LX register reaches 0. The 'JZ END' instruction jumps to the label 'END' when the zero flag is set, which happens when the LX register reaches 0. At 'END', the HLT instruction halts the program. So, there is no visible output from this code.
What does the following ICL 1900 PLAN Assembly language code do?
START STO LX, 10
STO LY, 0
LOOP ADD LY, LX
SUB LX, 1
JNZ LOOP
This code initializes the LX register with the value 10 and the LY register with the value 0. It then enters a loop where it adds the value in the LX register to the LY register, subtracts 1 from the LX register, and continues the loop until the LX register reaches 0. The result is that the LY register holds the sum of the numbers from 1 to 10.
What does the following ICL 1900 PLAN Assembly language code do?
START STO LX, 0
STO LY, 1
LOOP ADD LX, LY
STO LY, LX
JNZ LOOP
This code initializes the LX register with the value 0 and the LY register with the value 1. It then enters a loop where it adds the value in the LY register to the LX register, stores the result in the LY register, and continues the loop until the LX register becomes non-zero. This code essentially implements a single-threaded Fibonacci sequence generator.

Wrap-up questions

Final candidate for ICL 1900 PLAN Assembly language. Developer role questions

The final few questions should evaluate the candidate's teamwork, communication, and problem-solving skills. Additionally, assess their knowledge of microservices architecture, serverless computing, and how they handle ICL 1900 PLAN Assembly language. application deployments. Inquire about their experience in handling system failures and their approach to debugging and troubleshooting.

How would you perform bitwise operations in ICL 1900 PLAN Assembly language?

ICL 1900 PLAN Assembly language provides several instructions for bitwise operations, including 'AND' for bitwise AND, 'OR' for bitwise OR, and 'XOR' for bitwise XOR. These instructions operate on the values in registers.

What is the purpose of the 'PUSH' and 'POP' instructions in ICL 1900 PLAN Assembly language?

The 'PUSH' and 'POP' instructions are used to manipulate the stack. 'PUSH' pushes a value onto the stack, and 'POP' pops a value off the stack. These instructions are often used to save and restore register values around subroutine calls.

How would you handle input and output in ICL 1900 PLAN Assembly language?

Input and output in ICL 1900 PLAN Assembly language are handled through system calls. The 'SYS' instruction is used to make a system call, with the system call number and parameters passed in registers.

ICL 1900 PLAN Assembly language. application related

Product Perfect's ICL 1900 PLAN Assembly language. development capabilities

Beyond hiring for your ICL 1900 PLAN Assembly language. engineering team, you may be in the market for additional help. Product Perfect provides seasoned expertise in ICL 1900 PLAN Assembly language. projects, and can engage in multiple capacities.

ICL 1900 PLAN Assembly language. Consultive assessments

ICL 1900 PLAN Assembly language. Application Conversion Assessment ICL 1900 PLAN Assembly language. Application Integration Assessment ICL 1900 PLAN Assembly language. Data & Database Integration Assessment

Custom ICL 1900 PLAN Assembly language. development projects

Custom ICL 1900 PLAN Assembly language. App Conversion ICL 1900 PLAN Assembly language. Custom App Development Process App UI Design for ICL 1900 PLAN Assembly language. Facelifts

Hiring guide for ICL 1900 PLAN Assembly language. Engineers

ICL 1900 PLAN Assembly language. Developer Hiring Guide

What you’re looking for early on

The ideal back-end app developer

What you’re looking to see on the ICL 1900 PLAN Assembly language. engineer at this point.

ICL 1900 PLAN Assembly language. Consultive assessments

Custom ICL 1900 PLAN Assembly language. development projects