Instructions
Objective
Write a program that allows users to type a character and display it in upper and lower case, and the ascii code in hex and decimal in Pep9 assembly language.
Requirements and Specifications
Write the following program using Pep9 using Assembly Language
- First load the value FFFF in the A register.
- Save the value in A to memory and display the value using decimal out. ( This should display a -1 then an LF )
- Next, get a character from the user using character input. For simplicity, we will assume that the user types in a lower case alpha character.
- Display the following properties of the character: Original Character then LF Character as Uppercase then LF Decimal ASCII value of the Character then LF Decimal ASCII value of the Uppercase Letter then LF Hex value of the original lowercase letter then LF Other requirements for this program: Put the data section in low memory and Branch around it. Use the A register. DO NOT use the X register Print a LF after each output. This program should work for any lowercase letter submitted by the user. This program should work running it several times changing the input. That is, it should not work only the first time you run it. Run it a couple of times changing the input each time Deliverables: Turn in the following electronically: file with your assembly code with the pep extension: eg. prog1.pep Hints: When you save the assembly code, it saves a .pep file. You may need to load and store 1 and 2 byte values using Load/Store and LoadByte and StoreByte. Remember to put a stop instruction at the end of your program. Remember that you are to work individually on your programs. You should not discuss your ideas and algorithms with other people. Sample input/output: Input: j Output: -1 j J 106 74 006A *Note that this program should work for any lowercase input. (Not just lower case j)
Screenshots of output
Source Code
BR start ; branch to start of program
number: .WORD 0 ; place to save number
lletter: .BYTE 0 ; place to save lower case letter
uletter: .BYTE 0 ; place to save upper case letter
start: LDWA 0xFFFF,i ; Load the value FFFF in the A register.
STWA number,d ; save the number in A in memory
DECO number,d ; display the value using decimal out
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
LDBA charIn,d ; Read a character
STBA lletter,d ; save character in memory
SUBA 32,i ; convert letter to uppercase by subtracting 32
STBA uletter,d ; save character in memory
LDBA lletter,d ; load original character from memory
STBA charOut,d ; display original char
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
LDBA uletter,d ; load uppercase character from memory
STBA charOut,d ; display uppercase char
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
ANDA 0,i ; clear A to zero
LDBA lletter,d ; load lowercase character from memory
STWA number,d ; save the value as a 2 byte number
DECO number,d ; display lowercase ASCII value
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
LDBA uletter,d ; load uppercase character from memory
STWA number,d ; save the value as a 2 byte number
DECO number,d ; display uppercase ASCII value
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
LDBA lletter,d ; load lowercase character from memory
STWA number,d ; save the value as a 2 byte number
HEXO number,d ; display lowercase char hex value
LDBA 0xA,i ; load LF char
STBA charOut,d ; display LF to change line
STOP ; End the program
.END