Multiply by two in FAT16?

Cookiecrumbles222 · July 21, 2019

Hey, guys so I'm coding this translator but I can't seem to get it to multiply by two anyone know why it's not working? the code is below, the issue is definitely in the multiply by 2 lines, the output is 23:46:0< i want it to be 23:46:12, With the input C6BD. Thanks for any help!

TITLE test Template

; Name: Kade Cook
; Date: 7/21/2019

INCLUDE Irvine32.inc
.data
	;--------- Enter Data Here
	vPlace byte "Summer 2019",0
	vThing byte "Assembler",0
	vName byte "Kade Cook",0
	vTimeField byte "--:--:--",0

.code
main PROC
	;--------- Enter Code Below Here
	call clrscr
	
	mov dh, 15    ;----- row
	mov dl, 20   ;----- column
	call gotoxy

	mov edx, offset vPlace
	call WriteString

	mov dh, 16 
	mov dl, 20
	call gotoxy

	mov edx, offset vThing
	call WriteString

	mov dh, 17
	mov dl, 20
	call gotoxy

	mov edx, offset vName
	call WriteString

	mov dh, 19
	mov dl, 20
	call gotoxy

	call ReadHex  ;---  Stores in EAX
	ror ax,8 ;-- 1001 --> 1100

	mov ecx, eax							;--- Make backup

	;---------------------------------------------------------------------------------------------------- Set Hours

	AND ax, 1111100000000000b				;--- Get first 5 bits the Hour
	SHR ax, 11								;--- Shift to end 0000000000011111

	MOV bh, 10								;--- Math
	DIV bh									;--- Math
	ADD ax, 3030h							;--- Make normal number

	mov word ptr [vTimeField+0], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	mov dh, 20								;--- Moves mouse
	mov dl, 20								;--- Moves mouse
	call gotoxy								;--- Moves mouse

	;---------------------------------------------------------------------------------------------------- Set Mins

	mov eax,ecx
	
	AND ax, 0000011111100000b				;--- Get middle 6 bits the Mins
	SHR ax, 5								;--- Shift to end

	MOV bh, 10								;--- Math
	DIV bh									;--- Math
	ADD ax, 3030h							;--- Make normal number

	mov word ptr [vTimeField+3], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	;---------------------------------------------------------------------------------------------------- Set Secs

	mov eax,ecx

    AND ax, 0000000000011111b				;--- Get last 5 bits the Secs

	MOV bh, 10								;--- Math
	DIV bh									;--- Math

	SHL ax, 1								;--- Multiply by 2

	ADD ax, 3030h							;--- Make normal number

	
	mov word ptr [vTimeField+6], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	
	mov edx, offset vTimeField				;--- Write to screen
	call WriteString						;--- Write to screen


	call ReadHex
	exit
main ENDP

END main

Cookiecrumbles222 · July 22, 2019

41 minutes ago, Cookiecrumbles222 said:

Hey, guys so I'm coding this translator but I can't seem to get it to multiply by two anyone know why it's not working? the code is below, the issue is definitely in the multiply by 2 lines, the output is 23:46:0< i want it to be 23:46:12, With the input C6BD. Thanks for any help!


TITLE test Template

; Name: Kade Cook
; Date: 7/21/2019

INCLUDE Irvine32.inc
.data
	;--------- Enter Data Here
	vPlace byte "Summer 2019",0
	vThing byte "Assembler",0
	vName byte "Kade Cook",0
	vTimeField byte "--:--:--",0

.code
main PROC
	;--------- Enter Code Below Here
	call clrscr
	
	mov dh, 15    ;----- row
	mov dl, 20   ;----- column
	call gotoxy

	mov edx, offset vPlace
	call WriteString

	mov dh, 16 
	mov dl, 20
	call gotoxy

	mov edx, offset vThing
	call WriteString

	mov dh, 17
	mov dl, 20
	call gotoxy

	mov edx, offset vName
	call WriteString

	mov dh, 19
	mov dl, 20
	call gotoxy

	call ReadHex  ;---  Stores in EAX
	ror ax,8 ;-- 1001 --> 1100

	mov ecx, eax							;--- Make backup

	;---------------------------------------------------------------------------------------------------- Set Hours

	AND ax, 1111100000000000b				;--- Get first 5 bits the Hour
	SHR ax, 11								;--- Shift to end 0000000000011111

	MOV bh, 10								;--- Math
	DIV bh									;--- Math
	ADD ax, 3030h							;--- Make normal number

	mov word ptr [vTimeField+0], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	mov dh, 20								;--- Moves mouse
	mov dl, 20								;--- Moves mouse
	call gotoxy								;--- Moves mouse

	;---------------------------------------------------------------------------------------------------- Set Mins

	mov eax,ecx
	
	AND ax, 0000011111100000b				;--- Get middle 6 bits the Mins
	SHR ax, 5								;--- Shift to end

	MOV bh, 10								;--- Math
	DIV bh									;--- Math
	ADD ax, 3030h							;--- Make normal number

	mov word ptr [vTimeField+3], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	;---------------------------------------------------------------------------------------------------- Set Secs

	mov eax,ecx

    AND ax, 0000000000011111b				;--- Get last 5 bits the Secs

	MOV bh, 10								;--- Math
	DIV bh									;--- Math

	SHL ax, 1								;--- Multiply by 2

	ADD ax, 3030h							;--- Make normal number

	
	mov word ptr [vTimeField+6], ax			;--- Put into the string --- hrs +0 || mins +3 || secs +6

	
	mov edx, offset vTimeField				;--- Write to screen
	call WriteString						;--- Write to screen


	call ReadHex
	exit
main ENDP

END main

I figured it out if anyone stumbles upon this post later the solution is to change the order of operations and move the multiply by two line above the math line where you divide.