----------------------
 PQ> Hi, I have written a small make shift SVGA viewer in Nasm and I
 PQ> am having problems. I can get it to load a 640x480x16m image to
 PQ> XMS and then I want it to copy 64k at once to A000 then alter
 PQ> the windows, then another 64k until the image is displayed. Yet
 PQ> when the image is placed on the screen it looks wrong. Can
 PQ> anyone tell me if they can see anything wrong here? The TREE.RAW
 PQ> file is a 640x480x16m RAW RGB file.
make sure that the data in the RAW file is being matched properly with
the data sent to the screen...(err, if the file is GBR, you'll have to
make some changes.  Test by creating a dummy file with only one of the
colors set...then if it works, well...you know).
 PQ> APOLOGIES IN ADVANCE FOR ALL BAD CODING, COMMENTS, WASTEFULNESS!
Never apologize for comments.  Apologize for lack of comments.
 PQ> SEGMENT Main CLASS=Code USE16
 PQ> Mov Ax, Data
 PQ> Mov Ds, Ax
switch to tasm.  mov ds, @data
(TASM is well worth its price...never tried 1.0, but 2.1 was pretty good)
(I really shouldn't comment upon this, though.)
 PQ> Mov Ax, Extra
 PQ> Mov Es, Ax
 PQ> ; *** Save Current Video Mode ***
 PQ> Mov Ax, 0F00h
 PQ> Int 10h
 PQ> Mov [Es:Old_VMode WRT Extra], Al
Not quite compatible with all video cards.  Some early versions of VESA
(such as supported by Trident) tend to screw up there.
 PQ> ; *** Get XMS Driver Address ***
 PQ> Push Es
 PQ> Mov Ax, 4310h
 PQ> Int 2Fh
 PQ> Mov [Xms WRT Data], Bx
 PQ> Mov [Xms+2 WRT Data], Es
Err...Sure?  I'm not, as it will also return an external A20 handler w/
al=80h...  Shouldn't comment, though.
 PQ> Pop Es
 PQ> ; *** Allocate 1Mb of Xms ***
 PQ> Mov Ah, 09h
 PQ> Mov Dx, 1024
 PQ> Call Far [Xms WRT Data]
 PQ> Mov [X_Handle WRT Data], Dx      ; Store Handle for Block
 PQ> ; *** Open File ***
 PQ> Mov Ax, 3D00h
 PQ> Mov Dx, Filename WRT Data
 PQ> Int 21h
 PQ> Jnc Cont
 PQ> Jmp Exit
 PQ> Cont    Mov [F_Handle WRT Data], Ax
 PQ> Mov Bx, Ax
 PQ> ; *** Setup up minimum EMM Block ***
 PQ> Mov DWord [Emm WRT Data], 0400h                 ; 1k Transfer
 PQ> Mov Word [S_Offset WRT Data], Buffer WRT Extra
 PQ> Mov Word [S_Offset+2 WRT Data], Es              ; Es:Buffer
 PQ> Mov Ax, [X_Handle WRT Data]
 PQ> Mov [D_Handle WRT Data], Ax                     ; D_Handle =
 PQ> X_Handle 
 PQ> ; *** Read into Xms ***
 PQ> RXms    Push Ds                 ; Store Ds
 PQ> Push Es                 ; Store Es
 PQ> Pop Ds                  ; Ds = Es       ; Extra
 PQ> Mov Ax, 3F00h
 PQ> Mov Cx, 0400h
 PQ> Mov Dx, Buffer WRT Extra
 PQ> Int 21h                 ; Read 1k into Ds:Dx
Try pop'ng DS here.  Save a byte rather than doing it later.
 PQ> Cmp Ax, 0000h           ; Are we at the end of the file?
It's slightly smaller (and faster) to use an operatiohn like
"or ax, ax" instead of this CMP...saves one byte.
 PQ> Je CFile                ;  Yes, Close File
 PQ> Pop Ds
 PQ> Mov Si, Emm WRT Data    ; Ds:Si => Emm Structure
 PQ> Mov Ah, 0Bh
 PQ> Call Far [Xms WRT Data]    
 PQ> Add DWord [D_Offset WRT Data], 0400h
 PQ> Jmp RXms
 PQ> ; *** Close File ***
 PQ> CFile   Pop Ds
 PQ> Mov Ax, 3E00h
 PQ> Int 21h
 PQ> ; *** Set up Minimum Emm for Xms to Svga ***
 PQ> Mov DWord [Emm WRT Data], 10000h        ; 64k Transfer
 PQ> Mov Ax, [X_Handle WRT Data]
 PQ> Mov [S_Handle WRT Data], Ax             ; S_Handle = X_Handle
 PQ> Mov DWord [S_Offset WRT Data], 00000000h
 PQ> Mov Word [D_Handle WRT Data], 0000h
 PQ> Mov Word [D_Offset WRT Data], 0000h
 PQ> Mov Word [D_Offset+2 WRT Data], 0A000h
 PQ> ; *** Set SVGA Mode ***
 PQ> Mov Ax, 4F02h
 PQ> Mov Bx, 112h
 PQ> Int 10h
Check granularity here, also...the default 640x480x24bit on my sister's
is in 4k pages (yuck, but there is a better one to use).
 PQ> ; *** Transfer from XMS to A000:0000 ***
 PQ> Xor Dx, Dx
 PQ> T_Xms   Mov Ah, 0Bh
 PQ> Mov Si, Emm WRT Data
 PQ> Call Far [Xms WRT Data]     
 PQ> ;  * Increase SVGA CPU Window by 64k *
 PQ> Mov Ax, 4F05h
 PQ> Xor Bx, Bx
 PQ> Inc Dx
 PQ> Int 10h
Not on all systems.
 PQ> Mov EAx, [S_Offset WRT Data]
 PQ> Cmp EAx, 921600             ; Size of original file
 PQ> Jnb RExit
Must you use a constant here?
 PQ> Add EAx, 000010000h
 PQ> Mov [S_Offset WRT Data], EAx
 PQ> Jmp T_Xms
 PQ> ; *** Restore Video Mode ***
 PQ> RExit   Mov Ah, 00h
 PQ> Mov Al, [Es:Old_VMode WRT Extra]
 PQ> Int 10h
 PQ> Exit    Mov Ax, 4c00h
 PQ> Int 21h
What, you don't want to return an ERRORLEVEL status flag?  Aww...
(Just wanted to say something)
 PQ> SEGMENT Data CLASS=Data
 PQ> Filename        db      'TREE.RAW',0    ; Filename
 PQ> Xms             dd      00000000h       ; Xms Driver Location
 PQ> X_Handle        dw      0000h           ; Xms block Handle
 PQ> F_Handle        dw      0000h           ; File Handle
 PQ> ; *** Emm Block ***
 PQ> Emm             dd      00000000h       ; Number of Bytes to Move (
 PQ> Even ) S_Handle        dw      0000h           ; Source Handle
 PQ> S_Offset        dd      00000000h       ; Offset into source block
 PQ> D_Handle        dw      0000h           ; Destination Handle
 PQ> D_Offset        dd      00000000h       ; Offset into destination
 PQ> block ; *****************
why not define it as a struct?  It looks better in source form, but does
the same thing compiled.
 PQ> SEGMENT Extra CLASS=Bss
 PQ> Old_VMode       Resb    01h
 PQ> Buffer          Resb    0500h
 PQ> SEGMENT Stack CLASS=Stack STACK
 PQ> resb    0FFh
 PQ> cheers..
 
Yes.  I may just need a drink.  ;)
I'm not going to comment on XMS usage, but be careful with the way you seem
to be calling it.
Some multitaskers tend to allow access to XMS handles and then deallocate the
handles.  I'm not saying any names. ("Microsoft" will remain unspoken.  You
can read it if you want to, I can't stop you.)
Send internet email that you don't want a response to:
generic666@hotmail.com
... "Bother," said Pooh, as Piglet raped Kanga.
 * BlueWave/QWK 666 Beta * 
--- Synchronet+SBBSecho v1.25
 * Origin: Bass Computer  (5o4)646-o3o7  Slidell, LA, US (1:3828/9)
---------------

FIDO MESSAGE AREA==> TOPIC: 145 ASSEMBLY LANG. Ref: EDB00005Date: 09/04/97
From: BILLY TIERNEY                                         Time: 10:10am
\/To: PHIL QUINTON                                        (Read 1 times)
Subj: Graphix mode Windowing.

::To: All  From: Phil Quinton  Subj: Graphix mode Windowing.  ::
----------------------
 PQ> I have looked in Ralph Browns Interrupt list but I still have
 PQ> a problem with graphics modes that use more memory than
 PQ> the 64k segment that it resides in.
 PQ> Can someone give me a step by step instruction on doing
 PQ> windowing so I can move the 64k segment at A000 around
 PQ> the video memory so I can draw to the full screen and not
 PQ> just the top section :-)
 
No problem.. I'll send it as an XXEncoded .ZIP file.
Err...it's a bit big, so the response will be over several more messages.
Sorry, everyone who has to deal with it.  (Takes up less space then the
specs, though.)
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***** END OF BLOCK 1 *****
Send internet email that you don't want a response to:
generic666@hotmail.com
... Step up to MAX Graphics and let RIP graphics [R]est [I]n [P]eace.
 * BlueWave/QWK 666 Beta * 
--- Synchronet+SBBSecho v1.25
 * Origin: Bass Computer  (5o4)646-o3o7  Slidell, LA, US (1:3828/9)
---------------

FIDO MESSAGE AREA==> TOPIC: 145 ASSEMBLY LANG. Ref: EDB00006Date: 09/04/97
From: BILLY TIERNEY                                         Time: 10:14am
\/To: PHIL QUINTON                                        (Read 1 times)
Subj: Graphix mode Windowing.

::To: All  From: Phil Quinton  Subj: Graphix mode Windowing.  ::
----------------------
 PQ> I have looked in Ralph Browns Interrupt list but I still have
 PQ> a problem with graphics modes that use more memory than
 PQ> the 64k segment that it resides in.
 PQ> Can someone give me a step by step instruction on doing
 PQ> windowing so I can move the 64k segment at A000 around
 PQ> the video memory so I can draw to the full screen and not
 PQ> just the top section :-)
 
Part two of four.
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***** END OF BLOCK 2 *****
Send internet email that you don't want a response to:
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... Step up to MAX Graphics and let RIP graphics [R]est [I]n [P]eace.
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 * Origin: Bass Computer  (5o4)646-o3o7  Slidell, LA, US (1:3828/9)
---------------

FIDO MESSAGE AREA==> TOPIC: 145 ASSEMBLY LANG. Ref: EDB00007Date: 09/04/97
From: BILLY TIERNEY                                         Time: 10:18am
\/To: PHIL QUINTON                                        (Read 1 times)
Subj: Floating Point Numbers

::To: All  From: Phil Quinton  Subj: Floating Point Numbers  ::
----------------------
 PQ> Can someone tell me the format of the different
 PQ> floating point numbers so that I can use the FPU
 PQ> and then print out the results.
Ok...here we go...
the format of a floating point number that the FPU manages is an IEEE real
(32 bit).  I forget exactly what it is, but I think it's something like:
s ccccccc mmmmmmmmmmmmmmmmmmmmmmmm
s=sign
c=character...It's a value with 127 added on to it.  (E.g. a value of
  zero here is actually 127)
m=mantissa or something.  This is the portion that actually specifies the
  number.
The number is formed kinda like this:
  2^(Character-127) * Matnissa / 2^23
 and don't forget to add in the sign.
You should be able to verify this (after a few minutes of work) by writing a
simple program w/ Turbo Pascal (DO NOT USE ANY MICROSOFT PRODUCT FOR THIS:
Microsoft has several different INcompatible float formats.  They may not use
them any more with their newer products, but it was nasty in MS-Fortran,
MS-C, etc) and writing a float to a file.  Try to decipher it afterwards.  I
think that the mantissa has an assumed value of one (But can't recall).
Very sorry, I haven't dealt with any of this in a while.  Good luck!
Send internet email that you don't want a response to:
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... I'm writing a telephone book, can I have your number?
 * BlueWave/QWK 666 Beta * 
--- Synchronet+SBBSecho v1.25
 * Origin: Bass Computer  (5o4)646-o3o7  Slidell, LA, US (1:3828/9)
---------------

FIDO MESSAGE AREA==> TOPIC: 145 ASSEMBLY LANG. Ref: EDB00008Date: 09/05/97
From: WILLIAM TIERNEY                                       Time: 11:07am
\/To: REUBEN SHEPEK                                       (Read 1 times)
Subj: Floating Point Numbers

::To: Phil Quinton  From: Reuben Shepek  Subj: Floating Point Numbers  ::
----------------------
 PQ>Can someone tell me the format of the different
 PQ>floating point numbers so that I can use the FPU
 PQ>and then print out the results.
 RS> This may be what you want:
 RS> single             double       ment to be +or-
 RS> +x.xxE+yy         +x.xxxxxD+yy  yy is from -39 to +38 the power of 10
 RS> -     -           -        -        multiplyed be x.xx or x.xxxxx
I do believe he is refering to the actual structure, rather than the
notation...
... No frog floating.
 * BlueWave/QWK 666 Beta * 
---
  Blue Wave/QWK v2.12 
 * Origin: Bass Computer  (5o4)646-o3o7  Slidell, LA, US (1:3828/9)
---------------

FIDO MESSAGE AREA==> TOPIC: 145 ASSEMBLY LANG. Ref: EDB00009Date: 09/05/97
From: WILLIAM TIERNEY                                       Time: 11:10am
\/To: BO SCHREURS                                         (Read 1 times)
Subj: Array of Structures

::To: All  From: Bo Schreurs  Subj: Array of Structures  ::