Is there a way to combine 2 bytes into a single byte?
Example:
0000 0100 = 4
&
0000 0011 = 3
=
0100 0011
I'm trying to display the number 43 to 2 BCD to decimal decoder's using only 1 595 shift register.
Tinkering with the nixie 74141 display driver.
Use the left shift operator.
a = 0b00000100;
b = 0b00000011;
c = b << 4 | a;
Thanks wvmale I also found this nibble thread. Seems to me, years ago, 4 bits was considered a (word) come to find out it's called a (nibble) 
Bit, nibble, byte for 1, 4, 8 bits. Nibble is not used much.
The size of a word is based on how many bits the processor handles in one operation - it's 8 bits on an AVR based Arduino; 32 bits on an ESP8266.