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Index > OS Construction > RainbowSnakeOS - boot sector snake video game

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Palma3000



Joined: 16 Dec 2023
Posts: 3
Location: Ukraine
Palma3000 16 Dec 2023, 19:57
RainbowSnakeOS, a 512 byte OS and snake video game written in 16-bit x86 assembly language (FASM). It can be run from boot sector and MS DOS as .com application.

source code


Description: source code
Download
Filename: rainbowsnakeos-main.zip
Filesize: 7.95 KB
Downloaded: 230 Time(s)



Last edited by Palma3000 on 17 Dec 2023, 11:34; edited 1 time in total
Post 16 Dec 2023, 19:57
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20126
Location: In your JS exploiting you and your system
revolution 17 Dec 2023, 10:57
gitlab requires JS to see anything.

Please post the code here as an attachment.
Post 17 Dec 2023, 10:57
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Palma3000



Joined: 16 Dec 2023
Posts: 3
Location: Ukraine
Palma3000 17 Dec 2023, 11:35
Done
Post 17 Dec 2023, 11:35
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20126
Location: In your JS exploiting you and your system
revolution 17 Dec 2023, 13:41
Thanks.

BTW: You can eliminate the extra 'struct.inc' file by changing the VARS definition to this:
Code:
struc VARS {
  .len rw 1
  .coords rw SNAKE_MAX_LENGTH
  .food rw 1
  .state rb 1
  .res rb 1
}
virtual at 0
        VARS VARS
        sizeof.VARS = $
end virtual    
Post 17 Dec 2023, 13:41
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Furs



Joined: 04 Mar 2016
Posts: 2441
Furs 17 Dec 2023, 18:06
Gonna put it on my boot manager's options… Wink
Post 17 Dec 2023, 18:06
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Palma3000



Joined: 16 Dec 2023
Posts: 3
Location: Ukraine
Palma3000 17 Dec 2023, 19:39
revolution
Thank you. I will read more about FASM macroses.

Furs
It`s great.
Post 17 Dec 2023, 19:39
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Roman



Joined: 21 Apr 2012
Posts: 1701
Roman 18 Dec 2023, 11:21
Code:
struc VARS {
  .len rw 1
  .coords rw SNAKE_MAX_LENGTH
  .food rw 1
  .state rb 1
  .res rb 1
}
virtual at 0
        VARS VARS
        sizeof.VARS = $
end virtual  
;in code
mov [VARS.state],1
mov [eax+VARS.state],1
    


IDA pro show:
Code:
mov     large byte ptr ds:2Ch, 1 ;size 7 bytes
mov     byte ptr [eax+2Ch], 1 ;ok 4 bytes
    
Post 18 Dec 2023, 11:21
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macomics



Joined: 26 Jan 2021
Posts: 913
Location: Russia
macomics 18 Dec 2023, 15:31
Quote:
IDA pro show:
Code:
mov     large byte ptr ds:2Ch, 1 ;size 7 bytes
mov     byte ptr [eax+2Ch], 1 ;ok 4 bytes    

Code:
virtual at eax ; 0
        VARS VARS
        sizeof.VARS = $
end virtual    
Post 18 Dec 2023, 15:31
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Roman



Joined: 21 Apr 2012
Posts: 1701
Roman 18 Dec 2023, 15:47
Code:
virtual at eax ; 0
        VARS VARS
        sizeof.VARS = $
end virtual     


sizeof.VARS = $ ;fasmw 1.73 error invalid value
Post 18 Dec 2023, 15:47
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revolution
When all else fails, read the source


Joined: 24 Aug 2004
Posts: 20126
Location: In your JS exploiting you and your system
revolution 18 Dec 2023, 16:13
Code:
sizeof.VARS = $ - $$    
Post 18 Dec 2023, 16:13
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