Emu XL-7 & MP-7 User's Group

Hexadecimal is a base-16 counting system. In decimal (base 10) we use  
the digits 0-9. The sum 9+1 leads to an answer that cannot be  
expressed in a single digit so we add a '10s' column, put a 1 in it  
and put zero in the units column, hence: 10. Hex, as it is base 16  
needs 16 digits to represent its units, so we have 0-9 which have  
their usual decimal meaning and then A-F for the hex units whose  
decimal values are 10, 11, 12, 13, 14, and 15. So, the sum F+1 is 15+1  
in decimal = 16. As 16 cannot be represented by a single hex digit we  
put a 1 in the 16s column and a zero in the units column to give: 10.  
So 10 in hex is 16 in decimal.

Thus we see that FF in hex is 255 in decimal (15*16 + 15).

Hex is widely used in computing circles because of its ability to  
represent powers of 2 in a few digits. A single 8-bit byte can hold up  
to 256 binary values (from 00000000 to 11111111). As each nybble (4- 
bits, or half a byte) has a maximum value of 15 decimal (1111) then a  
single byte can be represented by a maximum of two hex digits.


On 23 Feb 2010, at 01:31, Rob wrote:

> I've only been producing and using the Emu a few months. I've been  
> reading manuals and everything on the internet I can find. I am  
> starting to understand Hex & have figure out NRPNs and CC. BUT some  
> SysEx is alien to me. The Emu manual has things like KK VV XX YY ZZ  
> NN but hex is 0 to H. The sysex info seems to have different  
> meanings for different commands for the letters.
>
> 8n kk vv is the command for note off.
>
> n = midi number
> kk = ?
> vv = ?
>
> Is this so standard that all companies shouldn't have to define it  
> and I'm missing some chart on it?
>
> Is 8n kk vv all I enter or do I need more numbers for machine ID,  
> EMU id, on, off, etc?
>
> Most of the tutorial sites treat you like a computer programer not a  
> layman.
>
>
>