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Programming > Assembly x86 > Re: vga bios in...
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Re: vga bios initialization entry point

by Mike Gonta <spamtrap@[EMAIL PROTECTED] > Apr 25, 2008 at 01:55 PM

On Apr 21, 3:24 am, "stam...@[EMAIL PROTECTED]
"wrote:

> I disassembled the code at C000: and got this:
> 0000c0000 55               push bp
> 0000c0001 aa               stosb
> 0000c0002 58               pop ax
> 0000c0003 e919a8           jmp 0xba81f

> Anyone here got any idea what I'm seeing?

>From the XT-AT Handbook:

"A valid module will have 55h as byte 0, 0AAh as byte 1, and a
length indicator in byte 2. The length byte is the number of 512
byte blocks over which a checksum (modulo hex 100) must be
zero. (The length byte must not exceed 0FBh, regardless of the
length of your code, so you must force a sum of 0 starting
with byte 0 up to whatever length byte 3 represents. Your
actual code may be longer, but an error will occur if the length
byte is larger than 0FBh).


Mike Gonta
look and see - many look but few see

http://aeBIOS.com
 




 7 Posts in Topic:
vga bios initialization entry point
"stamari@[EMAIL PROT  2008-04-21 00:24:22 
Re: vga bios initialization entry point
Brendan <spamtrap@[EM  2008-04-21 07:07:12 
Re: vga bios initialization entry point
Cyril Novikov <spamtr  2008-04-21 08:43:11 
Re: vga bios initialization entry point
ArarghMail804NOSPAM <s  2008-04-21 05:09:11 
Re: vga bios initialization entry point
"stamari@[EMAIL PROT  2008-04-21 10:49:48 
Re: vga bios initialization entry point
"stamari@[EMAIL PROT  2008-04-21 11:33:38 
Re: vga bios initialization entry point
Mike Gonta <spamtrap@  2008-04-25 13:55:30 

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tan12V112 Thu Jul 24 0:37:23 CDT 2008.