hi guys. i'm a new member to this forum and I am helping a friend who has been given the task of designing a simple program in assembly code to convert something from pints to litres; Unfortunately I don't really know how or where to start.
the 8086 code set is defined as:
adc Add with carry flag
add Add two numbers
and Bitwise logical AND
call Call procedure or function
cbw Convert byte to word (signed)
cli Clear interrupt flag (disable interrupts)
cwd Convert word to doubleword (signed)
cmp Compare two operands
dec Decrement by 1
div Unsigned divide
idiv Signed divide
imul Signed multiply
in Input (read) from port
inc Increment by 1
int Call to interrupt procedure
iret Interrupt return
j?? Jump if ?? condition met
jmp Unconditional jump
lea Load effective address offset
mov Move data
mul Unsigned multiply
neg Two's complement negate
nop No operation
not One's complement negate
or Bitwise logical OR
out Output (write) to port
pop Pop word from stack
popf Pop flags from stack
push Push word onto stack
pushf Push flags onto stack
ret Return from procedure or function
sal Bitwise arithmetic left shift (same as shl)
sar Bitwise arithmetic right shift (signed)
sbb Subtract with borrow
shl Bitwise left shift (same as sal)
shr Bitwise right shift (unsigned)
sti Set interrupt flag (enable interrupts)
sub Subtract two numbers
test Bitwise logical compare
xor Bitwise logical XOR
Now i did do some of this type of thing years ago but i am struggling and i think i need a few pointers. I take it the computer needs to do this process:
1.take the conversion factor (0.57) and convert it into binary and place it into one of the index registers.
2.take the input number say the number of pints, convert to binary, and put that into another register
3.perform somekind of division and put that number into another memory location
4.convert the answer back into decimal and output.
Am I getting the right idea or am i totally lost? It seems really simple at first but its confusing me. I do not necessarily want to know the exact answer, i'm more interested in working out how to arrive at it. Any explanations would be gratefully recieved. My email is zowow@hotmail.com or you could reply here. Hope You Can Help! It's one of those problems that will really annoy me if i dont work it out.
Thanks guys.