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Cream of the Crop 22
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TOP.ASM
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Assembly Source File
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1994-12-28
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1KB
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43 lines
; TOP.ASM for E32 - Copyright (C) 1994 Douglas Herr
; all rights reserved
include model.inc
public top
include dataseg.inc
extrn dirty_bits:byte, left_margin:word, save_column:byte
extrn cursor:dword, top_of_screen:dword, cur_posn:word
extrn file_row:dword, first_row:byte, saved_pos:word
extrn display_mode:byte
@curseg ends
include codeseg.inc
;
; This moves the cursor to the top of the file
;
top proc near
xor eax,eax
mov cursor,eax ; cursor to start of buffer
mov top_of_screen,eax
mov left_margin,ax ; move to the far left margin
mov save_column,al ; save the cursor column
dec eax
mov saved_pos,ax ; reset row,col on top line
neg eax
mov file_row,eax
or dirty_bits,al ; redraw the screen
dec eax
add ah,first_row
mov al,display_mode
shr al,2 ; AL = 1 if hex mode
dec al ; AL = 0 if hex mode
not al ; AL = 0FFh if hex mode
and al,10 ; AL = 10 if hex mode, 0 if ASCII mode
mov cur_posn,ax ; home the cursor
ret
top endp
@curseg ends
end