Virtual-Assembling-Machine (VAM)

This is a virtual machine you can program in assembler. It is easy to use and perfect for beginners!

The commands:

• LOAD x:
  • copies the value in Rx to A
  • increases the value in BZ by 1
• DLOAD i:
  • directly loads the number i in A
  • increases the value in BZ by 1
• STORE x:
  • copies the value in A to Rx
  • increases the value in BZ by 1
• ADD x:
  • adds the value in Rx to the value of A
  • stores the result in A
  • increases the value in BZ by 1
• SUB x:
  • subtracts the value in Rx from the value in A
  • stores the result in A
  • increases the value in BZ by 1
• MULT x:
  • multiplies the value in Rx with the value in A
  • stores the result in A
  • increases the value in BZ by 1
• DIV x:
  • devides the value in A by the value in Rx
  • stores the result in A
  • increases the value in BZ by 1
• JUMP n:
  • loads the number n in BZ
• JGE n:
  • loads the number n in BZ if the value in A is bigger or equal zero
  • if not: increases the value in BZ by 1
• JGT n:
  • loads the number n in BZ if the value in A is greater than zero
  • if not: increases the value in BZ by 1
• JLE n:
  • loads the number n in BZ if the value in A is less or equal zero
  • if not: increases the value in BZ by 1
• JLT n:
  • loads the number n in BZ if the value in A is less than zero
  • if not: increases the value in BZ by 1
• JEQ n:
  • loads the number n in BZ if the value in A is equal zero
  • if not: increases the value in BZ by 1
• JNE n:
  • loads the number n in BZ if the value in A is not equal zero
  • if not: increases the value in BZ by 1
• END:
  • increases the value in BZ by 1
  • terminates the program run

Other important stuff:

• Rx:
  • a register you can use to save numbers (1 Byte)
  • this virtual machine has got 15 (x can be an number from 1 to 15)
• A:
  • the accumulator contains the value for the next calculation and gets its result
• BZ:
  • contains the address of the next command (the line number)
  • if you change this number, you can jump to an other part of your code
• SR:
  • the Status Register contains the flags whether the result of the last logical operation was too big for one byte (Overflow) an if it was bigger or smaller than zero