flat assembler - 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:	322 Time(s)

Last edited by Palma3000 on 17 Dec 2023, 11:34; edited 1 time in total

16 Dec 2023, 19:57

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
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.

17 Dec 2023, 10:57

Palma3000

Joined: 16 Dec 2023
Posts: 3
Location: Ukraine

Palma3000 17 Dec 2023, 11:35

Done

17 Dec 2023, 11:35

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
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

17 Dec 2023, 13:41

Furs

Joined: 04 Mar 2016
Posts: 2564

Furs 17 Dec 2023, 18:06

Gonna put it on my boot manager's options… Wink

17 Dec 2023, 18:06

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.

17 Dec 2023, 19:39

Roman

Joined: 21 Apr 2012
Posts: 1847

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

18 Dec 2023, 11:21

macomics

Joined: 26 Jan 2021
Posts: 1041
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

18 Dec 2023, 15:31

Roman

Joined: 21 Apr 2012
Posts: 1847

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

18 Dec 2023, 15:47

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20451
Location: In your JS exploiting you and your system

revolution 18 Dec 2023, 16:13

Code:

sizeof.VARS = $ - $$

18 Dec 2023, 16:13

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