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OP_EA.X68
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TEST ORG $1000
START ORG $1000
; MOVEA.L #$1000,A2 ** TEST START ADDRESS
; MOVEA.L #$1030,A3 ** TEST END ADDRESS
; JSR MAIN_LOOP
*** D3 - ISOLATED BITS FOR COMPARISONS
*** D4 - MODE
*** D5 - CURRENT OPCODE
***
***
MAIN_LOOP
LEA jmp_table,A0 *Index into the table
LEA BUFFER, A6 * Load buffer into A6
CLR.L D3 *Zero it
* ADDQ.B #1,linecount
* CMPI.B #29,linecount
* BEQ IO_PauseOutput
MOVE.W (A2), D3
JSR PRINT_ADDRESS
ADD.W #2,A2 * Can safely increment the current address by a word
MOVE.W D3,D5 * Before manipulating opcode, store in D5
MOVE.B #12,D4 *Shift 12 bits to the right
LSR.W D4,D3 *Move the bits
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
JSR PRINT_BUFFER * GOT OPCODE AND EA LINE, PRINT IT
CMP A3,A2
BGT EXIT
* BGT END_PROGRAM
BRA MAIN_LOOP
* BRA END_PROGRAM
INCLUDE 'definitions.x68'
INCLUDE 'TEST_CODE.x68'
*
EXIT
SIMHALT
jmp_table JMP code0000
*ADDI
JMP code0001
JMP code0010
JMP code0011
JMP code0100
*CLR
JMP code0101
* ADDQ
JMP code0110
* BCC
* BGT
* BLE
JMP code0111
* MOVEQ
JMP code1000
* DIVU
* OR
JMP code1001
*SUB
JMP code1010
JMP code1011
* CMP
JMP code1100
* MULS
* AND
JMP code1101
*ADD
*ADDA
JMP code1110
* ASR
* ASL
* LSL
* LSR
* ROL
* ROR
JMP code1111
* todo: complete check for invalid opcode
code0000
JSR bits5to8 // RETURNS INTO D3
CMP.W #%0110, D3
BNE INVALID_OP
BRA ADDI
* todo: complete check for invalid opcode
code0001
* MOVE/A BYTE
** CHECK IF MOVEA
JSR bits8to10
CMP #%001,D3
BEQ INVALID_OP ** MOVEA CAN'T MOVE BYTE
JSR CHECK_INVALID_IMMEDIATE ***TO DO: SHOULD ALSO CHECK ADDRESS REGISTER FOR MOVES
BRA MOVE_B
* todo: complete check for invalid opcode
code0010 * MOVE/A LONG
* CHECK IF MOVEA
JSR bits8to10
CMP #%001,D3
BEQ MOVEA_L
JSR CHECK_INVALID_IMMEDIATE
BRA MOVE_L
* todo: complete check for invalid opcode
code0011 * MOVE/A WORD
JSR bits8to10
CMP #%001,D3
BEQ MOVEA_W
JSR CHECK_INVALID_IMMEDIATE
BRA MOVE_W
* TO DO: CHECK MOVEM AND LEA, ALL OTHER OPCODES CHECKED
code0100
JSR COPY_OPCODE // Makes a copy of Opcode into d2
*NOP
AND #%0000111111111111,D2
CMP.L #%000111001110001, D2
BEQ NOP
JSR COPY_OPCODE // Makes a copy of Opcode into d2
*RTS
AND #%0000111111111111,D2
CMP.L #%0000111001110101, D2
BEQ RTS
** TODO: NEED THE OPCODE FIRST
* NONE OF THE FOLLOWING OPCODES CAN DO IMMEDIATE
JSR bits11to16
CMP #%111100,D3
BEQ INVALID_EA
JSR COPY_OPCODE // Makes a copy of Opcode into d2
*JSR
AND #%0000111111000000,D2
CMP.L #%0000111010000000,D2
BEQ JSR
JSR COPY_OPCODE // Makes a copy of Opcode into d2
*CLR
JSR bits5to10
CMP.L #%001000, D3
BEQ CLR
CMP.L #%001001, D3
BEQ CLR
CMP.L #%001010, D3
BEQ CLR
JSR COPY_OPCODE // Makes a copy of Opcode into d2
AND #%0000000110000000,D2
CMP.L #%0000000110000000,D2
BEQ LEA
* MOVEM
** 0 1 0 0 1 | D | 0 0 1 | S M Xn
** AND #%0000111110000000,D2
* DATA REGISTER
** CMP.L #%0000100010000000, D2
** JSR MOVEM
* ADDRESS REGISTER (DECREMENTED)
** CMP.L #%0000110010000000, D2
BRA MOVEM
* TO DO: CHECK REMAINING OPCODES
code0101
BRA ADDQ
code0110
***TODO: ADDI
JSR COPY_OPCODE //make a copy of OPcode into d2
AND #%0000111100000000,D2
CMP.L #%0000010000000000,D2
BEQ BCC
CMP #%0000111000000000,D2
BEQ BGT
CMP #%0000111100000000,D2
BEQ BLE
code0111
BRA MOVEQ
code1000
JSR bits8to10
CMP #%011, D3 ** ONLY TIME IT'S DIVU
BEQ DIVU
BRA OR ** OTHERWISE OR
code1001 BRA SUB
code1010 BRA INVALID_OP
code1011
BRA CMP
code1100
JSR bits8to10
CMP #%111, D3 ** ONLY TIME IT'S MULS
BEQ MULS
BRA AND ** OTHERWISE AND
code1101
JSR COPY_OPCODE // Makes a copy of Opcode into d2
*ADDA
JSR bits8to10
CMP #%011, D3 ** WORD
BEQ ADDA
CMP #%111, D3 ** LONG
BEQ ADDA
*ADD
CMP #%000, D3 ** BYTE TO DATA REGISTER
BEQ ADD
CMP #%001, D3 ** WORD TO DATA REGISTER
BEQ ADD
CMP #%010, D3 ** LONG TO DATA REGISTER
BEQ ADD
CMP #%100, D3 ** BYTE TO EA
BEQ ADD
CMP #%101, D3 ** WORD TO EA
BEQ ADD
CMP #%110, D3 ** LONG TO EA
BEQ ADD
code1110
* ASR MEM
JSR bits1to10
CMP #%1110000011,D3
BEQ ASR_MEM
* ASL MEM
CMP #%1110000111,D3
BEQ ASL_MEM
CMP #%1110001111,D3
BEQ LSL_MEM
* LSR
CMP #%1110001011,D3
BEQ LSR_MEM
* ROR
CMP #%1110011011,D3
BEQ ROR_MEM
* ROL
CMP #%1110011111,D3
BEQ ROL_MEM
* LSL -- has register/immediate shift and
** bit 8 is the direction
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000100000000,D2
BEQ ASL_REG
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000000000000,D2
BEQ ASR_REG
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000100001000,D2
BEQ LSL_REG
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000000001000,D2
BEQ LSR_REG
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000100011000,D2
BEQ ROL_REG
JSR COPY_OPCODE
AND.L #%1111000100011000,D2
CMP #%1110000000011000,D2
BEQ ROR_REG
code1111 BRA INVALID_OP
*************************************
CLR
JSR CLR_BUFFER
JSR GETSIZE_CLR
JSR CLR_DEST
RTS
CLR_BUFFER
MOVE.B #'C',(A6)+
MOVE.B #'L',(A6)+
MOVE.B #'R',(A6)+
RTS
CLR_DEST
JSR ADD_SRC
RTS
*****************************
BCC
MOVE.B #'B',(A6)+
MOVE.B #'C',(A6)+
MOVE.B #'C',(A6)+
MOVE.B #' ',(A6)+
MOVE.B #'$',(A6)+
JSR PRINT_BUFFER_NL
JSR bits9to16
CMP.B $00,D3
BEQ DISPLACED_16
BRA DISPLACED_8
RTS
*************************************
DISPLACED_8
CLR.L D6
MOVE.W A2,D6
ADD.W D3,D6
MOVE.B #16,D2 // Setup for Base-16 conversion
MOVE.B D6,D1 // print the hex value in current address
MOVE.B #15,D0
TRAP #15
LEA BUFFER,A6
RTS
DISPLACED_16
CLR.L D6
CLR.L D3
MOVE.W (A2),D6
MOVE.W A2,D3
ADD.W D3,D6
ADD.W #2,A2
MOVE.B #16,D2 // Setup for Base-16 conversion
MOVE.W D6,D1 // print the hex value in current address
MOVE.B #15,D0
TRAP #15
LEA BUFFER,A6
CLR.L D6
RTS
DISPLACED_32
CLR.L D6
CLR.L D3
MOVE.L (A2),D6
MOVE.L A2,D3
ADD.W D3,D6
ADD.W #2,A2
MOVE.L (A2),D6
MOVE.L A2,D3
ADD.W D3,D6
ADD.W #2,A2
MOVE.B #16,D2 // Setup for Base-16 conversion
MOVE.L D6,D1 // print the hex value in current address
MOVE.B #15,D0
TRAP #15
LEA BUFFER,A6
CLR.L D6
RTS
*************************************
BGT
MOVE.B #'B',(A6)+
MOVE.B #'G',(A6)+
MOVE.B #'T',(A6)+
MOVE.B #' ',(A6)+
MOVE.B #'$',(A6)+
JSR PRINT_BUFFER_NL
JSR bits9to16
CMP.B #$00,D3
BEQ DISPLACED_16
BRA DISPLACED_8
RTS
*************************************
BLE
MOVE.B #'B',(A6)+
MOVE.B #'L',(A6)+
MOVE.B #'E',(A6)+
MOVE.B #' ',(A6)+
MOVE.B #'$',(A6)+
JSR PRINT_BUFFER_NL
JSR bits9to16
CMP.B #$00,D3
BEQ DISPLACED_16
CMP #$FF,D3
BEQ DISPLACED_32
BRA DISPLACED_8
RTS
*************************************
*************************************
ADDA
JSR ADDA_BUFFER
RTS
ADDA_BUFFER
MOVE.B #'A',(A6)+
MOVE.B #'D', (A6)+
MOVE.B #'D', (A6)+
MOVE.B #'A', (A6)+
JSR GETSIZE_ADDA
;Okay, the directionality bit in D6 should determine which order we should process bits in?
JSR ADDA_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR ADDA_DEST
RTS
ADDA_SRC
CLR.L D7
JSR bits14to16
MOVE.B D3,D7 ** need to know if immediate or absolute
JSR bits11to13 ** mode to jump with
MOVE.B D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3
JSR 0(A0,D3)
JSR bits14to16 ** register number if not absolute or immediate
CMP.B #$FF,D7
BNE NUM_INSERT
RTS
ADDA_DEST
MOVE.W #%001,D3 ;Can only have a ADDRESS register.
MOVE.W D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
JSR bits5to7
JSR insert_num
RTS
*********************************************
MOVEA_W
JSR MOVE_BUFFER
MOVE.B #'A', (A6)+
JSR SIZEISWORD
JSR MOVE_W_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR MOVE_W_DEST
RTS
MOVEA_L
JSR MOVE_BUFFER
MOVE.B #'A', (A6)+
JSR SIZEISLONG
JSR MOVE_L_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR MOVE_L_DEST
RTS
MOVE_BUFFER
MOVE.B #'M', (A6)+
MOVE.B #'O', (A6)+
MOVE.B #'V', (A6)+
MOVE.B #'E', (A6)+
RTS
MOVE_B
JSR MOVE_BUFFER
JSR SIZEISBYTE
JSR MOVE_B_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR MOVE_B_DEST
RTS
MOVE_B_SRC
JSR BITS11TO16_BYTE_SRC
RTS
MOVE_B_DEST
JSR BITS5TO10_BYTE_DEST
RTS
MOVE_W_SRC
JSR BITS11TO16_WORD_SRC
RTS
MOVE_W_DEST
JSR BITS5TO10_WORD_DEST
RTS
MOVE_L_SRC
JSR BITS11TO16_LONG_SRC
RTS
MOVE_L_DEST
JSR BITS5TO10_LONG_DEST
RTS
BITS11TO16_BYTE_SRC
JSR bits11to16
CMP #%111000, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%111001, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%111100, D3 *** IMMEDIATE
BEQ IMMEDIATE_BYTE
** OTHERWISE SOURCE IS DIFFERENT
JSR BITS11TO13MODE
RTS
BITS5TO10_BYTE_DEST
JSR bits5to10
CMP #%000111, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%001111, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%100111, D3 *** IMMEDIATE
BEQ IMMEDIATE_BYTE
** OTHERWISE DES IS DIFFERENT
JSR BITS8TO10MODE
RTS
*----
BITS11TO16_WORD_SRC
JSR bits11to16
CMP #%111000, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%111001, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%111100, D3 *** IMMEDIATE
BEQ IMMEDIATE_WORD
** OTHERWISE SOURCE IS DIFFERENT
JSR BITS11TO13MODE
RTS
BITS5TO10_WORD_DEST
JSR bits5to10
CMP #%000111, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%001111, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%100111, D3 *** IMMEDIATE
BEQ IMMEDIATE_WORD
** OTHERWISE DES IS DIFFERENT
JSR BITS8TO10MODE
RTS
*-------
BITS11TO16_LONG_SRC
JSR bits11to16
CMP #%111000, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%111001, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%111100, D3 *** IMMEDIATE
BEQ IMMEDIATE_LONG
** OTHERWISE SOURCE IS DIFFERENT
JSR BITS11TO13MODE
RTS
BITS5TO10_LONG_DEST
JSR bits5to10
CMP #%000111, D3 *** ABSOLUTE WORD
BEQ ABSOLUTE_WORD
CMP #%001111, D3 *** ABSOLUTE LONG
BEQ ABSOLUTE_LONG
CMP #%100111, D3 *** IMMEDIATE
BEQ IMMEDIATE_LONG
** OTHERWISE DES IS DIFFERENT
JSR BITS8TO10MODE
RTS
BITS11TO13MODE
JSR bits11to13
MOVE D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3
JSR 0(A0,D3)
JSR bits14to16
JSR insert_num
RTS
BITS8TO10MODE
JSR bits8to10
MOVE D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3
JSR 0(A0,D3)
JSR bits5to8
JSR insert_num
RTS
MOVE_W
JSR MOVE_BUFFER
JSR SIZEISWORD
JSR MOVE_W_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR MOVE_W_DEST
RTS
MOVE_L
JSR MOVE_BUFFER
JSR SIZEISLONG
JSR MOVE_L_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR MOVE_L_DEST
RTS
IMMEDIATE_BYTE
MOVE.B #'#', (A6)+
JSR ABSOLUTE_WORD
RTS
IMMEDIATE_WORD
MOVE.B #'#', (A6)+
JSR ABSOLUTE_WORD
RTS
IMMEDIATE_LONG
MOVE.B #'#', (A6)+
JSR ABSOLUTE_LONG
RTS
ADD
JSR ADD_BUFFER
RTS
ADD_BUFFER
MOVE.B #'A',(A6)+
MOVE.B #'D', (A6)+
MOVE.B #'D', (A6)+
JSR GETSIZE_ADD
;Okay, the directionality bit in D6 should determine which order we should process bits in?
CMP #1,D6
BNE ADD_DIRECTION_REVERSED
JSR ADD_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR ADD_DEST
RTS
ADD_DIRECTION_REVERSED
CLR.L D6
JSR ADD_DEST
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR ADD_SRC
RTS
** VALID SIZES ARE B (000) , W (001) ,L (010) ---> <EA> + DN --> DN
** B (100) , W (101) ,L (110) ---> DN + <EA> --> <EA>
ADD_SRC
CLR.L D7
JSR bits14to16
MOVE.B D3,D7 ** need to know if immediate or absolute
JSR bits11to13 ** mode to jump with
MOVE.B D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3
JSR 0(A0,D3)
JSR bits14to16 ** register number if not absolute or immediate
CMP.B #$FF,D7
BNE NUM_INSERT
RTS
NUM_INSERT
JSR insert_num
RTS
ADD_DEST
MOVE.W #%000,D3 ;Can only have a data register.
MOVE.W D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
JSR bits5to7
JSR insert_num
RTS
ADDI
JSR ADDI_BUFFER
JSR ADDI_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR ADDI_DES
RTS
ADDI_SRC
CLR.L D7
MOVE.w #%100,D7 ** need to know if immediate or absolute
MOVE.w #%111,D3 ** jumping into immediate
LEA jmp_mode,A0 *Index into the table
MULU #6,D3
JSR 0(A0,D3)
RTS
ADDI_DES
* LATER BITS ARE DESTINATION (11 TO 13 FOR MODE, 14 TO 16 FOR REGISTER)
** INVALID INCLUDE AN, IMMEDIATE AND TYPICAL INVALIDS
JSR bits11to13
CMP #%001, D3 **AN
BEQ INVALID_EA
CMP #%101, D3 **COMPLICATED
BEQ INVALID_EA
CMP #%110, D3 **COMPLICATED
BEQ INVALID_EA
JSR bits11to16 // check mode and register, invalid if immediate or 111010, 111011
CMP #%111100,D3 // immediate data
BEQ INVALID_EA
CMP #%111010,D3 // complicated
BEQ INVALID_EA
CMP #%111011,D3 // complicated
BEQ INVALID_EA
JSR bits11to13 ** grab bits to jump with\
MOVE.w D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3 *Form offset
CLR.L D7
JSR 0(A0,D3) *Jump indirect with index
CLR.L D3
JSR bits14to16 ** register number if not absolute or immediate
CMP.B #$FF,D7
BNE NUM_INSERT
RTS
ADDI_BUFFER
MOVE.B #'A',(A6)+
MOVE.B #'D', (A6)+
MOVE.B #'D', (A6)+
MOVE.B #'I', (A6)+
JSR GETSIZE_ADDI
** TODO: ADD SIZE BASED ON BITS 9 TO 10
** VALID SIZES ARE B (00),W (01) ,L (10)
MOVE.B #' ', (A6)+
RTS
LEA
JSR bits8to10 // 1 1 1
CMP #7, D2 // if the returned bits are not 7, it's not LEA
BNE INVALID_OP
JSR LEA_BUFFER
JSR LEA_SRC
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
JSR LEA_DEST
RTS
LEA_BUFFER
MOVE.B #'L',(A6)+
MOVE.B #'E', (A6)+
MOVE.B #'A', (A6)+
MOVE.B #' ', (A6)+
RTS
LEA_SRC
*INVALID SRCS ARE DN, AN, (AN)+, -(AN), 101 (COMPLICATED, 110, #DATA
JSR bits11to13 // source mode - D3
CMP #%000, D3
BEQ INVALID_EA
CMP #%001, D3
BEQ INVALID_EA
CMP #%011, D3
BEQ INVALID_EA
CMP #%100, D3
BEQ INVALID_EA
CMP #%101, D3
BEQ INVALID_EA
CMP #%110, D3
BEQ INVALID_EA
JSR bits11to16 // check mode and register, invalid if immediate or 111010, 111011
CMP #%111100,D3 // immediate data
BEQ INVALID_EA
CMP #%111010,D3 // complicated
BEQ INVALID_EA
CMP #%111011,D3 // complicated
BEQ INVALID_EA
JSR bits11to16 ** finds if absolute long or word
CMP #%111000, D3
BEQ ABSOLUTE_WORD
CMP #%111001, D3
BEQ ABSOLUTE_LONG
JSR bits11to13 // source mode - D3
MOVE D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
JSR bits14to16
JSR insert_num
CLR.L D3
CLR.L D4
RTS
LEA_DEST
CLR.L D4
LEA jmp_mode,A0 * LOAD MODE TABLE FOR JUMPING
MOVE.W #%001,D3 * LEA CAN ONLY HAVE AN AS DESTINATION
MOVE D3,D4
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
JSR bits5to7
JSR insert_num
RTS
*************************************************
ADDQ
JSR ADDQ_BUFFER
JSR ADDQ_SRC
MOVE.B #',',(A6)+
MOVE.B #' ',(A6)+
JSR ADDQ_DEST
RTS
ADDQ_SRC
JSR bits5to7
MOVE.B #'#',(A6)+
MOVE.B #%000,D4
JSR insert_num
CLR.L D4
RTS
ADDQ_DEST
JSR ADD_SRC
RTS
ADDQ_BUFFER
MOVE.B #'A',(A6)+
MOVE.B #'D', (A6)+
MOVE.B #'D', (A6)+
MOVE.B #'Q', (A6)+
JSR GETSIZE_ADDQ
** TODO: ADD SIZE BASED ON BITS 9 TO 10
** VALID SIZES ARE B (00),W (01) ,L (10)
RTS
****************************************
MOVEQ
JSR bits8to10 *** if bit 8 is ever equal to 1 it's invalid
CMP #%100,D3
BEQ INVALID_EA
CMP #%101,D3
BEQ INVALID_EA
CMP #%110,D3
BEQ INVALID_EA
CMP #%111,D3
BEQ INVALID_EA
JSR MOVEQ_BUFFER
JSR PRINT_BUFFER_NL
JSR bits9to16
MOVE.B #16,D2 // Setup for Base-16 conversion
MOVE.W D3,D1 // print the hex value in current address
MOVE.B #15,D0
TRAP #15
LEA BUFFER,A6
MOVE.B #',', (A6)+
MOVE.B #' ', (A6)+
CLR.L D3
MOVE.B #'D', (A6)+
JSR PRINT_BUFFER_NL
JSR BITS5TO7
MOVE.B #16,D2 // Setup for Base-16 conversion
MOVE.W D3,D1 // print the hex value in current address
MOVE.B #15,D0
TRAP #15
LEA BUFFER,A6
RTS
MOVEQ_BUFFER
MOVE.B #'M', (A6)+
MOVE.B #'O', (A6)+
MOVE.B #'V', (A6)+
MOVE.B #'E', (A6)+
MOVE.B #'Q', (A6)+
MOVE.B #' ', (A6)+
MOVE.B #'#', (A6)+
RTS
****************************************
DIVU
JSR bits8to10
CMP #%011,D3
BNE INVALID_EA
CLR.L D3
JSR DIVU_BUFFER
JSR DIVU_SRC
MOVE.B #',',(A6)+
MOVE.B #' ',(A6)+
JSR DIVU_DEST
RTS ;BRA PRINT_BUFFER
DIVU_BUFFER
MOVE.B #'D',(A6)+
MOVE.B #'I', (A6)+
MOVE.B #'V', (A6)+
MOVE.B #'U', (A6)+
MOVE.B #' ', (A6)+
RTS
DIVU_SRC
CLR.L D7
JSR bits14to16
MOVE.B D3,D7 ** need to know if immediate or absolute
JSR bits11to13
MOVE D3,D4
LEA jmp_mode,A0 *Index into the table
MULU #6,D3 *Form offset
JSR 0(A0,D3) *Jump indirect with index
CLR.L D3
JSR bits14to16
CMP.B #$FF,D7
BNE NUM_INSERT