Re: Excercices

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Date: Thu, 04 Nov 2004 02:19:18 GMT

On Mon, 1 Nov 2004 22:55:41 +0000 (UTC), "Annie" <me@privacy.net> wrote:

>
>On 2004-11-01 klee@unibwm.de said:
>
> > That is a typical answer of a politician, but that doesn't
> > work with me. Let's repeat your original statement:
> >
> > AA> Don't give me too much grief, Herbie. My version was only
> > AA> 85 bytes. Your version was -248- bytes. Hehe!
> >
> > You write: "My version WAS ..." and not "my now shorted version
> > is". This definitely claims, that the version posted in
> > <416641fe@post.newsfeeds.com> at Fri, 08 Oct 2004 14:03:59 +0200
> > had 85 bytes. This is untrue. If you assemble the posted source
> > with a86 you get a 175 byte com file.
>
>
>You are correct, Herbie. As I mentioned in my previous message,
>that version contained routines to check for 386 or higher, and
>to check for VGA video.
>
>You said they were not necessary, so I removed them.
>
>
> > AA> Herbie's 'batch file encoded' executable, which he posted
> > AA> here, decoded to 248 bytes.
> >
> > Yes, but you was aware, that this is not the code size
> > of the heart program, but the sum of the size of the decoder
> > routine and the ascii encoded program.
>
>
>You are correct; I was aware of that.
>
>
> > AA> I didn't assemble his actual source code, because it was
> > AA> written in Herb-Asm...his own 68K-style assembly language.
> >
> > This wasn't necessary at all. In a wise foresight, I didn't
> > post the source code but the listing of the program and this
> > listing ends with:
> >
> > 0000014f: b8 0000 move.w #0,r0
> > 00000152: cd 16 trap #$16
> > 00000154: b8 0003 move.w #$0003,r0
> > 00000157: cd 10 trap #$10
> > 00000159: c3 rts.w
> >
> > So, without assembling you can see, that the last byte of the
> > code is byte 0x59 (89) which gives a length of 90 bytes.
>
>
>Yes; you are correct, Herb.
>
>
> > AA> Herb -DID- correct a 'bug' that was introduced by my
> >
> > I did, but you still didn't.
>
>
>You are correct.
>
>
> > AA> porting of the code to 16-bit A86...which caused a
> > AA> slight misalignment of the screen image.
> >
> > It doesn't "cause a slight misalignment of the screen image"
>
>
>Actually, it does....a very slight 'tearing,' near the
>bottom of the screen.
>
>
> > but the program can complete fail dependent of the values in
> > upper half of the 32 bit registers at program start.
>
>
>You might be correct, but I did not experience that.
>
>
> > AA> Hopes this clears things up. Hehe!
> >
> > Yes and it also clears why we need Bush for another
> > 4 year to make the world more save.
>
>
>Hehe! You are talking to the wrong person, Herb. I have said
>many times that I am NOT a supporter of Bush. He is too liberal
>for me.
>
>In the American elections, I will vote for Michael Peroutka, of
>the Constitution Party.
>
>
> > AA> Here's the 'batch file' version that Herbert originally
> > AA> posted:
> >
> > And where is the listing I originally posted? The information was
> > there and not in the batch code.
>
>
>You are correct.
>
>
> > AA> And here's my 16-bit A86 ASM version:
> >
> > Still with all the bugs I already mentioned.
>
> _____
> Again, you are correct. ((( `\
> _ _`\ )
> But let's not fight, Herbie. (^ ) )
> Let's enjoy a nice meal of ~-( )
> bratwurst and sauerkraut! _'((,,,)))
> ,-' \_/ `\
> Here is some ASM code as a ( , |
> 'peace offering.' `-.-'`-.-'/|_|
> \ / | |
> =()=: / ,' aa

Hi Annie,

I used to use this technique on my old BBC most often to look
for graphics/sprites to steal from other programs (I'm not
a very good graphic designer ;) because you could just
load the program into the screen memory map. That was graphics
mode of course and when I finally got this running (after
a couple of modifications to please MASM -> A86 is somewhere
but couldn't find it) I couldn;t help noticing it is a text
mode memory viewer which I suppose is useful for looking
for ascii, Annie ... ;) The main prob with the program is in
the space of the status line it gives the instructions
for use rather than what is really important - the ADDRESS!
We need - "Addr : 00FE1230" The instructions can be included
in a small text file (or in the program with /? )

Anyway I suppose I am more interested in some method
to stop BIOS clearing all the memory as it usually does on
a PC. Surely setting up the intercept in CMOS would do
that but does it work in Windoze? Maybe it would be an
idea for a useful TSR

seeyafrom
laura

>;
>; MEMVIEW.ASM
>; Fast Full-Screen Raw Memory Viewer For DOS
>; Freeware
>;
>; This code assembles, as-is, with the A86 assembler.
>;
>code segment ;start of code segment
> org 100h ;DOS .COM file
> jmp start ;go do it
>;
>vid_add dw 0B800h ;our video address storage
>stor_2 dw 0 ;our memory location storage
>;
>start:
> call curs_off ;go turn off cursor
>;
>; Check for monochrome video. If found, store the appropriate address.
>;
> int 11h ;call BIOS equipment check
> and ax,30h ;test the return in AX
> cmp ax,30h ;do we have monochrome video?
> jne zero ;no, so assume color
> mov vid_add,0B000h ;yes, so store monochrome video address
>;
>; Set up and store our memory addresses, clear the screen,
>; display the program's status line to the screen, and
>; show the first screenful of data.
>;
>zero:
> xor ax,ax ;set memory address 0000:0000
> mov stor_2,ax ;store it
> call clr_scrn ;go clear the screen
> call stat_line ;go display the status line
> jmp fill_scrn ;go display memory data
>;
>; Get a keypress from the user, and act accordingly.
>; (We're checking scan codes here; not ASCII characters.)
>;
>get_key:
> mov ah,0 ;function 0 - wait for keypress
> int 16h ;call ROM BIOS keyboard services
> cmp ah,1 ;ESC key pressed?
> je exit ;yes, so go exit
> cmp ah,51h ;PG DN key pressed?
> je next_scrn ;yes, so go forward one screen
> cmp ah,49h ;PG UP key pressed?
> je prev_scrn ;yes, so go back one screen
> cmp ah,50h ;DOWN ARROW key pressed?
> je next_line ;yes, so go forward 1 line
> cmp ah,48h ;UP ARROW key pressed?
> je prev_line ;yes, so go back one line
> cmp ah,47h ;HOME key pressed?
> je home ;yes, so go to beginning of memory
> cmp ah,4Fh ;END key pressed?
> je end_mem ;yes, so go to end of memory
> jmp get_key ;go get another keypress
>;
>exit:
> call curs_on ;go turn cursor on
> call clr_scrn ;go clear the screen
> int 20h ;exit to DOS
>;
>next_scrn:
> mov ax,stor_2 ;retrieve memory pointer
> add ax,120 ;increment 24 lines
> mov stor_2,ax ;store it
> jmp fill_scrn ;go display memory data
>;
>prev_scrn:
> mov ax,stor_2 ;retrieve memory pointer
> sub ax,120 ;decrement 24 lines
> mov stor_2,ax ;store it
> jmp fill_scrn ;go display memory data
>;
>next_line:
> mov ax,stor_2 ;retrieve memory pointer
> add ax,5 ;increment by 80 bytes
> mov stor_2,ax ;store it
> jmp fill_scrn ;go display memory data
>;
>prev_line:
> mov ax,stor_2 ;retrieve memory pointer
> sub ax,5 ;decrement by 80 bytes
> mov stor_2,ax ;store it
> jmp fill_scrn ;go display memory data
>;
>home:
> mov stor_2,0 ;set memory pointer to 0000:0000
> jmp fill_scrn ;go display memory data
>end_mem:
> mov stor_2,65416 ;set pointer to show last screen of memory
>;
>; Fill the screen with memory contents.
>;
>fill_scrn:
> mov cx,1920 ;set counter CX to 1920
> xor si,si ;zero out SI
> xor di,di ;zero out DI
>do_more:
> mov ax,stor_2 ;retrieve memory pointer
> mov es,ax ;point our Extra Segment to that location
> mov es: dl,[si] ;
> mov ax,vid_add ;video address in AX
> mov es,ax ;point our Extra Segment to video address
> mov es: [di],dl ;
> inc si ;
> inc di ;next text cell
> inc di ;skip attribute cell
> dec cx ;decrement counter
> jnz do_more ;go again while CX > 0
> jmp get_key ;go get a keypress from user
>;
>;****************************************
>; Sub-routines.
>;****************************************
>;
>; Turn off cursor.
>;
>curs_off:
> mov ch,10h ;set bits to turn cursor off
> mov ah,1 ;function 1 - cursor control
> int 10h ;call ROM BIOS video services
> ret ;return to caller
>;
>; Turn cursor on.
>;
>curs_on:
> mov cx,0506h ;set bits to turn cursor on
> mov ah,1 ;function 1 - cursor control
> int 10h ;call ROM BIOS video services
> ret ;return to caller
>;
>; Clear the text-mode screen by over-writing video memory,
>; and home the cursor.
>;
>clr_scrn:
> mov ax,vid_add ;start of screen RAM in AX
> mov es,ax ;set Extra Segment to video address
> mov di,0 ;displacement on screen (0,0) in DI
> mov cx,4000 ;number of WORDS
> mov ax,0700h ;color attribute (7=white)
> cld ;clear direction flag
>clearloop:
> stosw ;mov [es:di],ax | inc di | inc di
> loop clearloop ;dec cx | cmp cx,0 | jnz clearloop
>;
> mov ah,2 ;function 2 - set cursor position
> mov bh,0 ;set page
> xor dx,dx ;row 0, column 0
> int 10h ;call ROM BIOS video services
> ret ;return to caller
>;
>; Move the status line directly to video memory.
>;
>stat_line:
> mov cx,80 ;read 80 words
> xor dx,dx ;zero out register DX
> mov ax,vid_add ;video address into AX
> mov es,ax ;move it into ES
> mov di,80*48 ;location 24,0
> mov si,offset ldat ;point SI to the status line data
> rep movsw ;move the entire string at once
> ret ;return to caller
>;
>ldat db ' 0 0M0E0M0V0I0E0W0 0v0.0 000.000 0 0',221,'0 0'
> db ' 0P0g0D0n0 0 0P0g0U0p0 0 0',25,'0 0 0',24,'0 0 0H0'
> db 'o0m0e0 0 0E0n0d0 0 0E0S0C0=0Q0u0i0t0 0 0'
> db 222,'0 0 0 0 0 0F0r0e0e0w0a0r0e0 0 0 0 0 0 0'
>;
>end
>

-- 
echo alru_aafriehdab@ittnreen.tocm |sed 's/\(.\)\(.\)/\2\1/g'

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