This is a 236 bytes Suboptimal Useless Minimalistic Operating System.

SUMOS features :

- Keyboard I/O managment

SUMOS doesn't feature :

- Interrupt handling
- Inter Processus Communication
- Memory protection, allocation or whatever who seems mandatory nowdays
- ...

But.

Theoricaly, you can do whatever you want with.

How it works ? 

The OS is a simple loop which read keystroke. Valid keys are :

- 0 to 9
- A B C D E and F

Every time you hit a valid key (0..F), the HEX value is written after
the last OS instruction.

When ESC key is stroke, the processor runs what you typed. Carefully
keystroke sequence may work.

Simplest, shortest and working program :

4EFAFF66

which means : JMP -152(PC) (back to start)

No warranty for whatever. This program can crash your computer. You are
warned. =)

 PERMSSN    UID  GID    PACKED    SIZE  RATIO METHOD CRC     STAMP          NAME
---------- ----------- ------- ------- ------ ---------- ------------ -------------
[generic]                  607    1025  59.2% -lh5- b503 Dec  8 19:53 sumos.readme
[generic]                  789    1439  54.8% -lh5- 6e4c Dec  8 19:55 sumos.s
---------- ----------- ------- ------- ------ ---------- ------------ -------------
 Total         2 files    1396    2464  56.7%            Dec  8 18:57