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Superior I/O
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* I/O will never overflow-- errors on the display are fixed instead of pushing the display up.
* I/O confirmation message lets the user decide their options before continuing.
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@schooley
schooley committed Dec 10, 2013
1 parent 3b1078b commit 2fcc889
Showing 1 changed file with 89 additions and 34 deletions.
123 changes: 89 additions & 34 deletions 3BDISS.X68
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Original file line number Diff line number Diff line change
Expand Up @@ -127,11 +127,17 @@ MSSG1 DC.B ' Enter the starting location of the code to be disassembled, or
DC.B ' for the starting address: 0x',0
MSSG2 DC.B ' Enter the ending location of the code to be disassembled, or leave it blank',CR,LF
DC.B ' for the ending address: 0x',0
MSSG3 DC.B ' Please note that this program will automatically detect the end of the file if',CR,LF
DC.B ' an address is out of range. You may now confirm your inputs before continuing.',CR,LF
DC.B ' Continue: [ENTER] Restart: [BACKSPACE] Quit: [0]',0
MSSG4 DC.B 'Press [ENTER] for the next page, or [CTRL] + [ENTER] for next line.',0
MSSG5 DC.B 'You have reached the end of the program. Press any key to restart, or 0 to quit.',0
HEADR DC.B 'Address OP-Code Operand',0
ERR0 DC.B 'The input address was too small.',CR,LF,0
ERR1 DC.B 'The input address was too big.',CR,LF,0
ERR0 DC.B ' !!! The input address was too small !!!',0
ERR1 DC.B ' !!! The input address was too large !!!',0
BLANK DC.B ' ',0
* XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX


START MOVE.B #0,IOLC Set line counter to 0
MOVE.B #0,IOBC Set bad counter to 0
Expand Down Expand Up @@ -373,7 +379,6 @@ DSPHXLP DBRA D2,*+8 Decrement count; if count is > 0, do not branch
BRA DSPHXLP Loop back
DSPHXRT MOVEM.L (SP)+,D0-D2/A1 Else, restore values
RTS Return to caller



*
Expand Down Expand Up @@ -419,17 +424,49 @@ DSPHXL SWAP D0 Swap first half to D0.W

*--------------------
* I/O
*--------------------
*--------------------

*
* Clear row: Clears the row specified in D1
*

CLRRW MOVEM.W D0/D1/A1,-(SP) Push D0, D1, and A1 to stack
ROL.W #8,D1 Move row to MSB
CLR.B D1 Set column to 0
ROL.W #8,D1 Move row to LSB
MOVE.B #11,D0 Position cursor at ROW/COL
TRAP #15
LEA BLANK,A1 Read blank row
MOVE.B #14,D0 Display A1 until null
TRAP #15
MOVEM.W (SP)+,D0/D1/A1 Restore D0, D1, and A1
RTS Return to caller

ILL0 LEA ERR0,A1 Starting location was too small
MOVE.B #14,D0
TRAP #15
BRA PRMPT1
BRA PRMPT1 Branch to prompt one

ILL1 LEA ERR1,A1 Starting location was too big
ILL1 LEA ERR1,A1 Starting location was too large
MOVE.B #14,D0
TRAP #15
BRA PRMPT1 Branch to prompt one

ILL2 MOVE.B #11,D0 Position cursor at COL/ROW
MOVE.W #$1D14,D1 Position after input location
TRAP #15
MOVE.L #MNADDR,D0 Move min address to D0
BSR DSPHXL Display min address to screen
MOVE.L #MNADDR,(A1) Move the min address to SLOC
BRA PRMPT2 Branch to the next prompt

PRMPT1 LEA MSSG1,A1 Starting location request message
PRMPT1 MOVE.B #$14,D1 Set row to $14
BSR CLRRW Clear the row (if existing input is present)
MOVE.B #11,D0 Position cursor at COL/ROW
MOVE.W #$0013,D1 Position
TRAP #15

LEA MSSG1,A1 Starting location request message
MOVE.B #14,D0
TRAP #15

Expand All @@ -439,14 +476,10 @@ PRMPT1 LEA MSSG1,A1 Starting location request message

CMP.B #8,D1 Compare the length of the input to 8
BGT ILL1 Branch to ILL1 if > 8

MOVE.L (A1),D0 Move input to D0
CMP.B #0,D1 Test the length of the input to 0
BNE *+12 If the input was not null, branch to convert input
MOVE.L #MNADDR,(A1) If the input was null, move the min address to SLOC
BRA PRMPT2 Branch to the next prompt

BSR ASCII2HEX Convert D0 to HEX in D1
CMP.B #0,D1 Compare the length of the input to 0
BEQ ILL2 If the input was null, branch to ILL2
BSR ASCII2HEX Else, convert D0 to HEX in D1

MOVE.L D1,(A1) Set SLOC to HEX value
CMP.L #$0000F0FF,D1 Compare starting location to 0
Expand All @@ -460,16 +493,32 @@ PRMPT1 LEA MSSG1,A1 Starting location request message

BRA PRMPT2 Branch to the next prompt

ILL2 LEA ERR0,A1 Ending location was too small
ILL3 LEA ERR0,A1 Ending location was too small
MOVE.B #14,D0
TRAP #15
BRA PRMPT2

ILL3 LEA ERR1,A1 Ending location was too big
ILL4 LEA ERR1,A1 Ending location was too big
MOVE.B #14,D0
TRAP #15

ILL5 MOVE.B #11,D0 Position cursor at ROW/COL
MOVE.W #$1B17,D1 Position after input location
TRAP #15
MOVE.L #MXADDR,D0 Move max address to D0
BSR DSPHXL Display max address to screen
MOVE.L #MXADDR,(A1) Move the max address to ELOC
BRA PRMPTDN Branch to prompt done

PRMPT2 LEA MSSG2,A1 Ending location request message
PRMPT2 MOVE.B #$15,D1 Set row to $15
BSR CLRRW Clear the row (if existing error is present)
MOVE.B #$17,D1 Set row to $17
BSR CLRRW Clear the row (if existing input is present)
MOVE.B #11,D0 Position cursor at COL/ROW
MOVE.W #$0016,D1 Position
TRAP #15

LEA MSSG2,A1 Ending location request message
MOVE.B #14,D0
TRAP #15

Expand All @@ -478,33 +527,39 @@ PRMPT2 LEA MSSG2,A1 Ending location request message
TRAP #15

CMP.B #8,D1 Compare the length of the input to 8
BGT ILL3 Branch to ILL3 if > 8

BGT ILL4 Branch to ILL4 if > 8
MOVE.L (A1),D0 Move input to D0
CMP.B #0,D1 Test the length of the input to 0
BNE *+12 If the input was not null, branch to convert input
MOVE.L #MXADDR,(A1) If the input was null, move the max address to ELOC
BRA PRMPTDN Branch to prompt done

BSR ASCII2HEX Convert D0 to HEX in D1
CMP.B #0,D1 Compare the length of the input to 0
BEQ ILL5 If the input was null, branch to ILL5
BSR ASCII2HEX Else, convert D0 to HEX in D1

MOVE.L D1,(A1) Set ELOC to HEX value

CMP.L #$0000F0FF,D1 Compare ending location to 0
BEQ HALT End program if 0

CMP.L #MNADDR,D1 Compare min ending location to min
BLS ILL2 Branch to ILL2 if <= min
BLS ILL3 Branch to ILL3 if <= min

CMP.L #MXADDR,D1 Compare ending location to max
BHI ILL3 Branch to ILL3 if > max
BHI ILL4 Branch to ILL4 if > max

MOVE.L (SLOC),D0 Move starting location data to D0
CMP.L D0,D1 Compare ending location to starting location
BLS ILL2 Branch to ILL3 if <= starting location
BLS ILL3 Branch to ILL3 if <= starting location

PRMPTDN MOVE.L (SLOC),(GBUFF) Store starting location in GBUFF for OP
BRA DSPHDR Branch to display method
PRMPTDN MOVE.B #$18,D1 Set row to $18
BSR CLRRW Clear the row (if existing error is present)
MOVE.B #11,D0 Position cursor at COL/ROW
MOVE.W #$0019,D1 Position
TRAP #15

LEA MSSG3,A1 Confirmation message
MOVE.B #14,D0
TRAP #15
MOVE.L (SLOC),(GBUFF) Store starting location in GBUFF for OP
MOVE.L (SLOC),(NGBUFF) Copy to NGBUFF
BRA REQKEY Branch to request key

*
* Display string: Displays string until NULL char
Expand Down Expand Up @@ -1256,15 +1311,15 @@ PAUSE BSR NEWLINE Display new line
LEA MSSG4,A1 Display keypress prompt
MOVE.B #14,D0 Display A1 until null char
TRAP #15
MOVE.B #12,D0 Keyboard echo
MOVE.B #0,D1 Hidden
TRAP #15

*
* Request Key: Request a keyboard input, and do not continue until a valid input was given
*

REQKEY MOVE.B #5,D0 Request keyboard input
REQKEY MOVE.B #12,D0 Keyboard echo
MOVE.B #0,D1 Hidden
TRAP #15
MOVE.B #5,D0 Request keyboard input
TRAP #15
CMP.B #$D,D1 Compare input to ENTER
BEQ DSPHDR If ==, branch to DSPHDR
Expand Down

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