Explain fourth group of 32 ascii character code, Electrical Engineering

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Explain Fourth group of 32 ASCII character code?

The fourth, and final, group of 32 ASCII character codes are set aside for the lower case alphabetic symbols, five additional special symbols, and another control character (delete).

Note that the lower case character signs use the ASCII codes 61h through 7Ah. If you evaluate the ASCII codes for the upper and lower case characters to binary, you will observe that the upper case symbols differ from their lower case equivalents in exactly one bit position.

The merely place these two codes differ is in bit five. Upper case characters forever contain a zero in bit five; lower case alphabetic characters always contain a one in bit five. You can use this information to quickly convert between upper and lower case and if you have an upper case character you can force it to lower case by setting bit five to one same as If you have a lower case character and you wish to force it to upper case, you can do so by setting bit five to zero and You can toggle an alphabetic character between upper and lower case by simply inverting bit five.

ASCII CODE
LSB	000	001	010	011	100	101	110	111
0000	NUL	DLE	SP	0	@	P	'	p
0001	SOH	DC1	!	1	A	Q	a	q
0010	STX	DC2	"	2	B	R	b	r
0011	ETX	DC3	#	3	C	S	c	s
0100	EOT	DC4	$	4	D	T	d	t
0101	ENQ	NAK	%	5	E	U	e	u
0110	ENQ	ACK	&	6	F	V	f	v
0111	BEL	ETB	'	7	G	W	g	w
1000	BS	CAN	(	8	H	X	h	x
1001	HT	EM	)	9	I	Y	i	y
1010	LF	SUB	*	:	J	Z	j	z
1011	VT	ESC	+	;	K	[	k	{
1100	FF	FS	,	<	L	\	l	\|
1101	CR	GS	-	=	M	]	m	}
1110	SO	RS	.	>	N	^	n	~
1111	SI	US	/	?	O	_	o	DEL

Certainly, bits five and six determine which of the four groups in the ASCII character set you're in:

Bit 6	Bit 5	Group
0	0	Control Characters
0	1	Digits and Punctuation
1	0	Upper Case and Special
1	1	Lower Case and Special

Consider the ASCII codes of the numeric digit characters:

Char	Dec	Hex
'0'	48	30
'1'	49	31
'2'	50	32
'3'	51	33
'4'	52	34
'5'	53	35
'6'	54	36
'7'	55	37
'8'	56	38
'9'	57	39

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