Computer Systems Organization I - Prof. Grishman
Write an LC-3 program which will convert a number from the ASCII
encoding of its hexadecimal value to a binary value. The input
will be a sequence of one to four ASCII characters, each either '0'
through '9' or 'A' through 'F' (upper case only). Each character
will be stored in the low-order seven bits of a word; the
sequence will be terminated by a full zero word. You may assume
that the input is correct (no invalid digits; no more than four
The program should contain two lines with labels "INPUT" (a character
string) and "OUTPUT" (a single word); for example,
INPUT .STRINGZ "12AB"
OUTPUT .FILL 0
We will test the program by modifying the string at INPUT and seeing if
you produce the correct value at OUTPUT.
Enter the program in assembly
language, with comments as appropriate. Also include your
name as a comment. Terminate
the program with a HALT operation.
Submit your program (.asm file)
by email, as an attachment, to me
and to the
e-tutor, Andrew Montalenti <firstname.lastname@example.org>,
by one minute before midnight on Tuesday,
October 11th. (Late assignments will be penalized 1/2 point
for each day late, out of a total of 4 points.) Label your email "CSO
For 0.5 points extra credit, allow a leading '#' character to
indicate that the number is in decimal rather than binary (For
example, "#12" would be converted to 00000000000011002 while
"12" would be converted to 00000000000100102.)