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LongTesting.X68
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*-----------------------------------------------------------
* Title :
* Written by :
* Date :
* Description:
*-----------------------------------------------------------
STACK EQU $B000
DEST_MODE EQU 250
FOUR_HEXABITS_IN_MEMORY EQU $300
FIRST_THREE_BITS_IN_TWELVE_BITS EQU $350
SECOND_THREE_BITS_IN_TWELVE_BITS EQU $400
THIRD_THREE_BITS_IN_TWELVE_BITS EQU $450
FOURTH_THREE_BITS_IN_TWELVE_BITS EQU $500
STORAGE_VAR EQU $550
START ORG $1000
LEA STACK,SP *set up stack pointer
ASK_STARTING_ADDRESS
LEA STARTING_MESSAGE, A1 *put address of startinge_message to A1
MOVE #14, D0 *display Null terminated string at (A1) without CR, LF
TRAP #15 *print the starting messsage
MOVEA.L #0,A1 *clear contents in A1 for the case ASK_STARTING_ADDRESS is called again
MOVE.W #2,D0 *read string input from keyboard and store at (A1)
TRAP #15
BRA CONVERT_STRING_TO_HEX
ASK_ENDING_ADDRESS
LEA ENDING_MESSAGE, A1 *put address of startinge_message to A1
MOVE #14, D0 *display Null terminated string at (A1) without CR, LF
TRAP #15 *print the starting messsage
MOVEA.L #0,A1 *clear contents in A1 for the case ASK_STARTING_ADDRESS is called again
MOVE.W #2,D0 *read string input from keyboard and store at (A1)
TRAP #15
BRA CONVERT_STRING_TO_HEX
CONVERT_STRING_TO_HEX
MOVE.B (A1)+, D0 *put one character from the user input string into D0
CMP.B #$46, D0 *check if that char is in valid range (0-9 and A-F in ASCII = 30-39 and 41-46 in hex)
BGT INVALID_INPUT *If the char is bigger than $46, it's invalid
CMP.B #$41, D0
BLT CONVERT_ZERO_TO_NINE_TO_HEX *If the char is less than $41, let CONVERT_ZERO_TO_NINE_TO_HEX deal with it
SUB.B #$37, D0 *if it is here, it means the char is between A-F(41-46), -37 to get A-F
ADD.L D0,D3
SUBI #1,D1 *trap task 2: length of input is retuned in D1.W
CMP.B #0,D1 *check if length is 0
BEQ DONE_CONVERTING_STARTING_STR *if length becomes 0, it means no more character to convert to hex
LSL.L #4,D3
BRA CONVERT_STRING_TO_HEX
CONVERT_ZERO_TO_NINE_TO_HEX
CMP.B #$39, D0 *if bigger than $39 and smaller than 41 it means invalid
BGT INVALID_INPUT
CMP.B #$30, D0 *if smaller than 30 it is also invalid
BLT INVALID_INPUT
SUB.B #$30,D0 *subtract 30 to get 0-9
ADD.L D0,D3
SUBI #1,D1
CMP.B #0,D1
BEQ DONE_CONVERTING_STARTING_STR
LSL.L #4,D3
BRA CONVERT_STRING_TO_HEX
INVALID_INPUT
LEA INVALID_INPUT_MESSAGE, A1 *put address of invalid_input_message to A1
MOVE #14, D0 *display Null terminated string at (A1) without CR, LF
TRAP #15 *print the starting messsage
CLR D3
BRA ASK_STARTING_ADDRESS *ask starting address again
DONE_CONVERTING_STARTING_STR
CMP #1,D5
BEQ DONE_CONVERTING_ENDING_STR
ADDI #1,D5
MOVEA.L D3, A3
CLR D3
BRA ASK_ENDING_ADDRESS
DONE_CONVERTING_ENDING_STR
CLR.W D5
MOVEA.L D3, A4 *PUT TO A4
CLR D3
BRA START_TO_HANDLE_OPCODE *continued from here after report2
START_TO_HANDLE_OPCODE
JSR IS_NEW_SCREEN_NEEDED
BRA DERIVING_OPCODE
DERIVING_OPCODE
LEA STR_SPACE,A1 *print a new line
MOVE.B #13,D0
TRAP #15
JSR PRINT_MEMORY_ADDRESS
JSR GET_NEXT_WORD
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
JSR SAVE_FIRST_HEX_IN_D3
CMP.B #$0D,D3
BEQ OPCODE_IS_ADD
CMP.B #$0B,D3
BEQ OPCODE_IS_CMP
CMP.B #$08,D3
BEQ OPCODE_IS_OR
CMP.B #$0C,D3
BEQ OPCODE_IS_AND
CMP.B #$4,D3
BEQ OPCODE_IS_4
CMP.B #$09,D3
BEQ OPCODE_IS_SUB
CMP.B #$00,D3
BEQ OPCODE_IS_MOVE
OPCODE_IS_SUB
LEA STR_SUB, A1 *Because it is SUB, print SUB to the console.
MOVE.B #14, D0
TRAP #15
JSR PRINT_DOT
BRA HEPLER_ADD_AND_OR
OPCODE_IS_4
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
LSL.W #8, D3
LSR.W #8, D3
CMPI.B #%01110101, D3 *0000 0000 0111 0101
BNE OPCODE_IS_JSR
BRA OPCODE_IS_RTS
RTS
OPCODE_IS_LEA
LEA STR_LEA, A1 *Because it is LEA, print out LEA to the console
MOVE.B #14, D0
TRAP #15
JSR PRINT_SPACE
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3 *Load first four hex into D3 agian to analyze
JSR ANALYZE_TWELVE_BITS *In order to print the rest, we need to analyze 12-bits in the opcde (16-bits)
JSR OUTPUT_SOURCE *output source to console
JSR PRINT_COMMA *print comma ','
JSR PRINT_SPACE *print ' '
JSR OUTPUT_ADDRESS_REGISTER
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
JSR PRINT_REGISTER_NUM
BRA DERIVING_OPCODE
RTS
OPCODE_IS_JSR
LSL.W #8, D3 ;GET BIT 7 AND 6
LSR.W #8, D3
LSR.W #6, D3
CMP #%10, D3 *111 010 010 000
BEQ IS_JSR *Does the actual printing
RTS
IS_JSR
LEA STR_JSR, A1 *Because it is JSR, print JSR to the console
MOVE.B #14, D0
TRAP #15
JSR ANALYZE_TWELVE_BITS
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3 *Load first four hex into D3 agian to analyze
JSR PRINT_SPACE
JSR OUTPUT_SOURCE
BRA DERIVING_OPCODE
RTS
OPCODE_IS_RTS
LEA STR_RTS, A1 *Because it is JSR, print JSR to the console
MOVE.B #14, D0
TRAP #15
BRA DERIVING_OPCODE
RTS
***********************************************************
OPCODE_IS_MOVE
LEA STR_MOVE,A1
MOVE.B #14,D0
TRAP #15
JSR PRINT_DOT
JSR ANALYZE_TWELVE_BITS *In order to print the rest, we need to analyze 12-bits in the opcde (16-bits)
JSR GRAP_LAST_TWO_BITS_IN_OPMODE *in order to know the size(B/W/L) we need to grab the last two bits in opmode
JSR PRINT_COMMON_SIZE *print size(B/W/L)
JSR PRINT_SPACE *print ' '
MOVE.W FOUR_HEXABITS_IN_MEMORY,D6 *Load first four hex into D3 agian to analyze
JSR ANALYZE_TWELVE_BITS
JSR OUTPUT_SOURCE_MOVE *output source to console
JSR PRINT_COMMA *print comma ','
JSR PRINT_SPACE *print ' '
JSR OUTPUT_DATA_REGISTER
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS,D3
JSR PRINT_REGISTER_NUM
BRA DERIVING_OPCODE
RTS
************************************************************
OPCODE_IS_OR
LEA STR_OR, A1 *Because it is OR, print OR to the console.
MOVE.B #14, D0
TRAP #15
JSR PRINT_DOT
BRA HEPLER_ADD_AND_OR
OPCODE_IS_CMP
LEA STR_CMP, A1 *Because it is CMP, print CMP to the console.
MOVE.B #14, D0
TRAP #15
JSR PRINT_DOT
JSR ANALYZE_TWELVE_BITS *In order to print the rest, we need to analyze 12-bits in the opcde (16-bits)
JSR GRAP_LAST_TWO_BITS_IN_OPMODE *in order to know the size(B/W/L) we need to grab the last two bits in opmode
JSR PRINT_COMMON_SIZE *print size(B/W/L)
JSR PRINT_SPACE *print ' '
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3 *Load first four hex into D3 agian to analyze
JSR ANALYZE_TWELVE_BITS
JSR OUTPUT_SOURCE *output source to console
JSR PRINT_COMMA *print comma ','
JSR PRINT_SPACE *print ' '
JSR OUTPUT_DATA_REGISTER
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
JSR PRINT_REGISTER_NUM
BRA START_TO_HANDLE_OPCODE
RTS
OPCODE_IS_AND
LEA STR_AND, A1 *Because it is AND, print AND to the console.
MOVE.B #14, D0
TRAP #15
JSR PRINT_DOT
BRA HEPLER_ADD_AND_OR
HEPLER_ADD_AND_OR *Helper for 'ADD' or 'AND' or 'OR' opcde
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
JSR ANALYZE_TWELVE_BITS *In order to print the rest, we need to analyze 12-bits in the opcde (16-bits)
JSR GRAP_LAST_TWO_BITS_IN_OPMODE *in order to know the size(B/W/L) we need to grab the last two bits in opmode
JSR PRINT_COMMON_SIZE *print size(B/W/L)
JSR PRINT_SPACE *print ' '
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
JSR ANALYZE_TWELVE_BITS
CMP #0, THIRD_THREE_BITS_IN_TWELVE_BITS
BNE DN_IS_EITHER_SOURCE_OR_DEST
JSR OUTPUT_SOURCE *output source to console
JSR PRINT_COMMA *print comma
JSR PRINT_SPACE *print space
JSR OUTPUT_DATA_REGISTER
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
JSR PRINT_REGISTER_NUM
BRA START_TO_HANDLE_OPCODE *branch back to this to derive next opcode
RTS
IS_NEW_SCREEN_NEEDED
ADD #1,D4
CMP #29,D4
BEQ LET_USER_ENTER
LEA STR_SPACE,A1
MOVE #14,D0
TRAP #15
RTS
LET_USER_ENTER
LEA STR_SPACE,A1 *print a new line
MOVE.B #13,D0
TRAP #15
LEA STR_PRESS_ENTER, A1 *Let user press enter key to continue to next screen.
MOVE.B #14, D0
TRAP #15
CLR D4
MOVE.B #5,D0
TRAP #15
RTS
OPCODE_IS_ADD
LEA STR_ADD, A1 *because it is ADD, print ADD out to console.
MOVE.B #14,D0
TRAP #15 *continue from here. after 00008762 ADD is printed out, it will come to this line
JSR PRINT_DOT
BRA HEPLER_ADD_AND_OR
DN_IS_EITHER_SOURCE_OR_DEST
MOVE.W FOUR_HEXABITS_IN_MEMORY,D3
JSR ANALYZE_TWELVE_BITS
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, D3
MOVE.W FOURTH_THREE_BITS_IN_TWELVE_BITS, FIRST_THREE_BITS_IN_TWELVE_BITS
MOVE.W D3, FOURTH_THREE_BITS_IN_TWELVE_BITS
MOVE.W SECOND_THREE_BITS_IN_TWELVE_BITS, D3
MOVE.W THIRD_THREE_BITS_IN_TWELVE_BITS, SECOND_THREE_BITS_IN_TWELVE_BITS
MOVE.W D3, THIRD_THREE_BITS_IN_TWELVE_BITS
MOVE.W THIRD_THREE_BITS_IN_TWELVE_BITS, D3
MOVE.W FOURTH_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
LSR #2,D3
CMPI.B #%000,D3
BEQ ADD_HELPER_1
JSR REGISTER_MODE_000 *it not equal to 000, then left side must be Dn
JSR PRINT_COMMA * prints a comma
JSR PRINT_SPACE * prints a space
JSR PRINT_DESTINATION
BRA START_TO_HANDLE_OPCODE * branch back to DERIVING_OPCODE to see next word
RTS
ADD_HELPER_1 *Needed for DN_IS_EITHER_SOURCE_OR_DEST
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
JSR PRINT_DESTINATION
JSR PRINT_COMMA
JSR PRINT_SPACE
CMPI.W #%1100, D7
BNE ADD_HELPER_2
CLR D7
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
BRA ADD_HELPER_3
ADD_HELPER_2
CLR D7
MOVE.W FOURTH_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
ADD_HELPER_3
JSR REGISTER_MODE_000
BRA START_TO_HANDLE_OPCODE
RTS
PRINT_DESTINATION
MOVE.W FIRST_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
MOVE.W SECOND_THREE_BITS_IN_TWELVE_BITS ,D3
CMPI.B #%000,D3
BEQ REGISTER_MODE_000
CMPI.B #%001,D3
BEQ REGISTER_MODE_001
CMPI.B #%010,D3
BEQ REGISTER_MODE_010
CMPI.B #%011,D3
BEQ REGISTER_MODE_011
CMPI.B #%100,D3
BEQ REGISTER_MODE_100
CMPI.B #%101,D3
BEQ REGISTER_MODE_111
RTS
REGISTER_MODE_000
JSR OUTPUT_DATA_REGISTER * Print Dn
JSR PRINT_REGISTER_NUM *Print register number
RTS
REGISTER_MODE_001
JSR OUTPUT_ADDRESS_REGISTER * Print An
JSR PRINT_REGISTER_NUM *Print register number
RTS
REGISTER_MODE_010 * Print (An)
LEA OPENING_PARENTHESIS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
JSR REGISTER_MODE_001
LEA CLOSING_PARENTHESIS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
REGISTER_MODE_011 * Print (An)+
JSR REGISTER_MODE_010
LEA PLUS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
REGISTER_MODE_100 * Print -(An)
LEA MINUS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
JSR REGISTER_MODE_010
RTS
REGISTER_MODE_111 *Print immediate data or absolute address
***********************************************************
OUTPUT_SOURCE_MOVE
MOVE.W FOURTH_THREE_BITS_IN_TWELVE_BITS, D6
MOVE.W THIRD_THREE_BITS_IN_TWELVE_BITS, D3
CMPI.B #%000,D3 *Prints Dn
BEQ REGISTER_MODE_000
CMPI.B #%001,D3 *Prints An
BEQ REGISTER_MODE_001
CMPI.B #%010,D3
BEQ REGISTER_MODE_010
CMPI.B #%011,D3 *Prints (An)+
BEQ REGISTER_MODE_011
CMPI.B #%100,D3 *Prints -(An)
BEQ REGISTER_MODE_100
*CMPI.B #%111,D3
*BEQ PRINT_IMMEDDATA_OR_ABSOADDRESS
RTS
******************************************************
OUTPUT_SOURCE
MOVE.W FOURTH_THREE_BITS_IN_TWELVE_BITS, STORAGE_VAR
MOVE THIRD_THREE_BITS_IN_TWELVE_BITS, D3
CMPI.B #%000,D3 *Prints Dn
BEQ REGISTER_MODE_000
CMPI.B #%001,D3 *Prints An
BEQ REGISTER_MODE_001
CMPI.B #%010,D3 *Prints (An)
BEQ REGISTER_MODE_010
CMPI.B #%011,D3 *Prints (An)+
BEQ REGISTER_MODE_011
CMPI.B #%100,D3 *Prints -(An)
BEQ REGISTER_MODE_100
*CMPI.B #%111,D3
*BEQ PRINT_IMMEDDATA_OR_ABSOADDRESS
RTS
******************************************************
PRINT_REGISTER_NUM_MOVE
MOVE.W D6,D3
CMPI.B #%000,D3
BEQ ZERO
CMPI.B #%001,D3
BEQ ONE
CMPI.B #%010,D3
BEQ TWO
CMPI.B #%011,D3
BEQ THREE
CMPI.B #%100,D3
BEQ FOUR
CMPI.B #%101,D3
BEQ FIVE
CMPI.B #%110,D3
BEQ SIX
CMPI.B #%111,D3
BEQ SEVEN
*************************************************
PRINT_REGISTER_NUM
MOVE.W STORAGE_VAR,D3
CMPI.B #%000,D3
BEQ ZERO
CMPI.B #%001,D3
BEQ ONE
CMPI.B #%010,D3
BEQ TWO
CMPI.B #%011,D3
BEQ THREE
CMPI.B #%100,D3
BEQ FOUR
CMPI.B #%101,D3
BEQ FIVE
CMPI.B #%110,D3
BEQ SIX
CMPI.B #%111,D3
BEQ SEVEN
OUTPUT_DATA_REGISTER *Dn
LEA DATA_REGISTER, A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
OUTPUT_ADDRESS_REGISTER *An
LEA ADDRESS_REGISTER, A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
OUTPUT_OPENING_PARENTHESIS
LEA OPENING_PARENTHESIS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
OUTPUT_CLOSING_PARENTHESIS
LEA CLOSING_PARENTHESIS, A1
JSR PRINT_MESSAGE_TO_CONSOLE
***
*******************************
PRINT_COMMON_SIZE_MOVE
CMPI.B #%01,D3
BEQ PRINT_BYTE_SIZE
CMPI.B #%11,D3
BEQ PRINT_WORD_SIZE
CMPI.B #%10,D3
BEQ PRINT_LONG_SIZE
RTS
*********************************
PRINT_COMMON_SIZE
CMPI.B #%00,D3
BEQ PRINT_BYTE_SIZE
CMPI.B #%01,D3
BEQ PRINT_WORD_SIZE
CMPI.B #%10,D3
BEQ PRINT_LONG_SIZE
CMPI.B #%00,D3
BEQ PRINT_BYTE_SIZE
CMPI.B #%01,D3
BEQ PRINT_WORD_SIZE
CMPI.B #%10,D3
BEQ PRINT_LONG_SIZE
RTS
GRAP_LAST_TWO_BITS_IN_OPMODE
JSR ANALYZE_TWELVE_BITS
MOVE.W SECOND_THREE_BITS_IN_TWELVE_BITS, D3
LSL #6,D3
LSL #8,D3
LSR #6,D3
LSR #8,D3
RTS
*This analyze 12 bits in opcode and divide them into four different 3-bits so that we
*can figure out the corresponding assembly code
ANALYZE_TWELVE_BITS
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
LSL #4,D3
LSR #4,D3
LSR #4,D3
LSR #4,D3
LSR #1,D3
MOVE.W D3, FIRST_THREE_BITS_IN_TWELVE_BITS
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3 *load the whole opcde(4-hex) back to D3 again to analyze the next 3-bits
LSL #7,D3
LSR #7,D3
LSR #6,D3
MOVE.W D3, SECOND_THREE_BITS_IN_TWELVE_BITS
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3 *load the whole opcde(4-hex) back to D3 again to analyze the next 3-bits
LSL #4,D3
LSL #4,D3
LSL #2,D3
LSR #4,D3
LSR #4,D3
LSR #2,D3
LSR #3,D3
MOVE D3, THIRD_THREE_BITS_IN_TWELVE_BITS
MOVE FOUR_HEXABITS_IN_MEMORY, D3 *load the whole opcde(4-hex) back to D3 again to analyze the next 3-bits
LSL #4,D3
LSL #4,D3
LSL #5,D3
LSR #4,D3
LSR #4,D3
LSR #5,D3
MOVE.W D3,FOURTH_THREE_BITS_IN_TWELVE_BITS
MOVE.W FOUR_HEXABITS_IN_MEMORY,D3
RTS
***************
*Get next four hexabits
GET_NEXT_WORD
MOVE.W (A3)+, D3 *A3=8762, D3 will have 0000D110.
MOVE.W D3,FOUR_HEXABITS_IN_MEMORY
CLR.L D7
MOVE.W D3, D7
CMPA.L A3,A4 *check if it reached to the ending address
BLE FINISH_PROGRAM
RTS
PRINT_MEMORY_ADDRESS
MOVE.L A3,D5
MOVE.L D5,FOUR_HEXABITS_IN_MEMORY
JSR HEX_TO_STRING
MOVE.W A3,D5
MOVE.W D5,FOUR_HEXABITS_IN_MEMORY
JSR HEX_TO_STRING
JSR PRINT_SPACE
RTS
SIMHALT
PRINT_SPACE
LEA STR_SPACE,A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
PRINT_DOT
LEA DOT,A1
JSR PRINT_MESSAGE_TO_CONSOLE
RTS
COMPARE_NUM_OR_LETTER *to figure out if the data is 0-9 or A-F
CMPI.B #$09,D3
BLE NUM_CONVERSION
BRA LETTER_CONVERSION
HEX_TO_STRING *steps to do to print as ascii
MOVE.W FOUR_HEXABITS_IN_MEMORY, D3
JSR SAVE_FIRST_HEX_IN_D3
JSR COMPARE_NUM_OR_LETTER
****************************
MOVE.W FOUR_HEXABITS_IN_MEMORY,D3
JSR SAVE_SECOND_HEX_IN_D3
JSR COMPARE_NUM_OR_LETTER
******************************
MOVE.W FOUR_HEXABITS_IN_MEMORY,D3
JSR SAVE_THIRD_HEX_IN_D3
JSR COMPARE_NUM_OR_LETTER
******************************
MOVE.W FOUR_HEXABITS_IN_MEMORY,D3
JSR SAVE_FOURTH_HEX_IN_D3
JSR COMPARE_NUM_OR_LETTER
****
CLR.L D3
RTS
***********
NUM_CONVERSION
ADDI.W #$30,D3
BRA CONV_LOOP
LETTER_CONVERSION
ADDI.W #$37,D3
BRA CONV_LOOP
CONV_LOOP
CMPI.B #$30,D3
BEQ ZERO
CMPI.B #$31,D3
BEQ ONE
CMPI.B #$32,D3
BEQ TWO
CMPI.B #$33,D3
BEQ THREE
CMPI.B #$34,D3
BEQ FOUR
CMPI.B #$35,D3
BEQ FIVE
CMPI.B #$36,D3
BEQ SIX
CMPI.B #$37,D3
BEQ SEVEN
CMPI.B #$38,D3
BEQ EIGHT
CMPI.B #$39,D3
BEQ NINE
CMPI.B #$41,D3
BEQ A
CMPI.B #$42,D3
BEQ B
CMPI.B #$43,D3
BEQ C
CMPI.B #$44,D3
BEQ D
CMPI.B #$45,D3
BEQ E
CMPI.B #$46,D3
BEQ F
SAVE_FIRST_HEX_IN_D3 *shift to get the first hexbit
LSR.W #4,D3
LSR.W #4,D3
LSR.W #4,D3
RTS
SAVE_SECOND_HEX_IN_D3 *shift to get the second hexbit
LSL.L #4,D3
LSR.W #4,D3
LSR.W #4,D3
LSR.W #4,D3
RTS
SAVE_THIRD_HEX_IN_D3 *shift to get the third hexbit
LSL.L #4,D3
LSL.L #4,D3
LSR.W #4,D3
LSR.W #4,D3
LSR.W #4,D3
RTS
SAVE_FOURTH_HEX_IN_D3 *shift to get the fourth hexbit
LSL.L #4,D3
LSL.L #4,D3
LSL.L #4,D3
LSR.W #4,D3
LSR.W #4,D3
LSR.W #4,D3
RTS
PRINT_MESSAGE_TO_CONSOLE
MOVE.B #14,D0
TRAP #15
RTS
FINISH_PROGRAM
SIMHALT
****
ZERO LEA PRT0,A1
BRA PRINT_NUM
ONE LEA PRT1,A1
BRA PRINT_NUM
TWO LEA PRT2,A1
BRA PRINT_NUM
THREE LEA PRT3,A1
BRA PRINT_NUM
FOUR LEA PRT4,A1
BRA PRINT_NUM
FIVE LEA PRT5,A1
BRA PRINT_NUM
SIX LEA PRT6,A1
BRA PRINT_NUM
SEVEN LEA PRT7,A1
BRA PRINT_NUM
EIGHT LEA PRT8,A1
BRA PRINT_NUM
NINE LEA PRT9,A1
BRA PRINT_NUM
A LEA PRTA,A1
BRA PRINT_NUM
B LEA PRTB,A1
BRA PRINT_NUM
C LEA PRTC,A1
BRA PRINT_NUM
D LEA PRTD,A1
BRA PRINT_NUM
E LEA PRTE,A1
BRA PRINT_NUM
F LEA PRTF,A1
BRA PRINT_NUM
*****
PRINT_COMMA
LEA COMMA,A1
BRA PRINT_MESSAGE_TO_CONSOLE
PRINT_PLUS LEA PLUS,A1
BRA PRINT_MESSAGE_TO_CONSOLE
PRINT_MINUS LEA MINUS,A1
BRA PRINT_MESSAGE_TO_CONSOLE
PRINT_BYTE_SIZE LEA BYTE,A1
BRA PRINT_MESSAGE_TO_CONSOLE
PRINT_WORD_SIZE LEA WORD,A1
BRA PRINT_MESSAGE_TO_CONSOLE
PRINT_LONG_SIZE LEA LONG,A1
BRA PRINT_MESSAGE_TO_CONSOLE
*Table for 0-9 && A-F
PRT0 DC.B '0',0
PRT1 DC.B '1',0
PRT2 DC.B '2',0
PRT3 DC.B '3',0
PRT4 DC.B '4',0
PRT5 DC.B '5',0
PRT6 DC.B '6',0
PRT7 DC.B '7',0
PRT8 DC.B '8',0
PRT9 DC.B '9',0
PRTA DC.B 'A',0
PRTB DC.B 'B',0
PRTC DC.B 'C',0
PRTD DC.B 'D',0
PRTE DC.B 'E',0
PRTF DC.B 'F',0
PRINT_NUM MOVE #14,D0
TRAP #15
RTS
STR_SPACE DC.W ' ',0
COMMA DC.W ',',0
STR_ADD DC.B 'ADD',0
STR_CMP DC.W 'CMP',0
STR_AND DC.W 'AND',0
STR_LEA DC.W 'LEA',0
STR_JSR DC.W 'JSR',0
STR_SUB DC.W 'SUB',0
STR_RTS DC.W 'RTS',0
STR_MOVE DC.W 'MOVE',0
STR_OR DC.W 'OR',0
STR_LSL DC.W 'LSL',0
STR_ASR DC.W 'ASR',0
STR_MOVEA DC.L 'MOVEA',0
STR_MOVEM DC.L 'MOVEM',0
STR_BGT DC.W 'BGT',0
STR_BLE DC.W 'BLE',0
STR_BCC DC.W 'BCC',0
DOT DC.B '.',0
BYTE DC.B 'B',0
WORD DC.B 'W',0
LONG DC.B 'L',0
DATA_REGISTER DC.W 'D',0
ADDRESS_REGISTER DC.W 'A',0
OPENING_PARENTHESIS DC.W '(',0
CLOSING_PARENTHESIS DC.W ')',0
PLUS DC.W '+',0
MINUS DC.W '-',0
STR_PRESS_ENTER DC.W 'Please press enter key to see the next screen',0
STARTING_MESSAGE DC.W 'Please enter the starting address:',0
ENDING_MESSAGE DC.W 'Please enter the ending address:',0
INVALID_INPUT_MESSAGE DC.W 'You entered an invalid address, ',0
END $1000
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