■ 3.2 Saturn Peripheral Standard Format

● Purpose of Saturn Peripheral Standard Format

The Saturn Peripheral Standard Format is prepared for the following purposes:

1. Being able to control multiplayer even if the peripheral data structure, type, and meaning are different.

2. Even if upper word compatible peripherals are released in the future, such as increasing the number of buttons, increasing the number of analog channels, and adding extended data, you can use the peripherals to operate multiplayer.
   Also, be able to control previously released applications.

● Saturn standard format types and data formats

There are currently four Saturn standard formats available for the purposes mentioned above. Each is explained below.

● Future expansion of standard format

At the moment, we have prepared the following four formats, but we plan to prepare them one by one when the need arises in the future.

• Saturn digital device
• Saturn analog device
• pointing device
• Keyboard device

● Precautions when using the standard format

In order to comply with the standard format, when the data size is larger than the standard format, delete excess data and use it. Also, when the data size is smaller than the standard format, it is realized by supplementing the missing data with other data. Also, as an example corresponding on the peripheral side, there is an analog XY control like an analog joystick, but when there is no corresponding digital input, using the fact that the analog XY data exceeds a certain value, U, There is a possibility that the peripheral side will adopt the method of turning the D, L, R bits on and off.

◆ Saturn digital device

It is a device consisting only of buttons represented by Saturn standard PAD.
The peripheral type is based on 0H and a data size of 2 bytes.
As a feature of the format, 1st Data has a configuration equivalent to the Mega Drive 3 button. Compatibility can be ensured by building an application so that the application can be controlled with only 1st Data. Table 3.10 shows the formats of Saturn digital devices.

Table 3.10 Saturn Digital Device Standard Format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Saturn Peripheral ID	0	0	0	0	Data size
1st Data	Right	Left	Down	Up	Start	A TRG	C TRG	B TRG
2nd Data	R TRG	X TRG	Y TRG	Z TRG	L TRG	Extended data
3rd Data	Extended data
・	Extended data
・	Extended data
nth Data	Extended data

A TRG, C TRG, B TRG, R TRG, X TRG, Y TRG, Z TRG, L TRG

Right, Left, Down, Up, Start buttons

It becomes 0 when the button is pressed.

◆ Saturn Analog Devices

It is a device equipped with an A / D converter such as an analog joystick, analog steering, and tablet.
The peripheral type is based on 1H and a data size of 5 bytes. (Actually, it changes for each peripheral.)
As a feature of the format, 1st Data has a configuration equivalent to the Mega Drive 3-button PAD. Compatibility can be ensured by building an application so that the application can be controlled with only 1st Data. Table 3.11 lists the standard formats for Saturn Analog Devices.

Table 3.11 Saturn Analog Devices Standard Format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Saturn Peripheral ID	0	0	0	1	Data size
1st Data	Right	Left	Down	Up	Start	A TRG	C TRG	B TRG
2nd Data	R TRG	X TRG	Y TRG	Z TRG	L TRG	Extended data
3rd Data	AX7	AX6	AX5	AX4	AX3	AX2	AX1	AX0
4th Data	AY7	AY6	AY5	AY4	AY3	AY2	AY1	AY0
5th Data	AZ7	AZ6	AZ5	AZ4	AZ3	AZ2	AZ1	AZ0
6th Data	Extended data
・	Extended data
・	Extended data
nth Data	Extended data

A TRG, C TRG, B TRG, R TRG, X TRG, Y TRG, Z TRG, L TRG

Right, Left, Down, Up, Start buttons

It becomes 0 when the button is pressed.

AX7 ~ AX0, AY7 ~ AY0, AZ7 ~ AZ0

The absolute value of the A / D converter output without a sign is output.

AX7 ~ AX0, AY7 ~ AY0

The upper left is (0,0) and the lower right is (255,255).

AZ7 ~ AZ0

The bottom is 0 and the top is 255.

reference:

Developer's Informaition / STN-34 "Analog Mission Stick Manual"

Developer's Informaition / STN-43 "Multi-Controller User's Manual Ver1.00"

◆ Pointing device

A device that outputs the amount of movement of a rotary encoder such as a mouse or trackball.
The peripheral type is basically 2H, and the data size is basically 3 bytes.
As a feature of the format, the data table of the pointing device does not have the equivalent data of the Megadrive 3-button PAD, unlike digital, analog and keyboard devices. Furthermore, since the movement of X and Y data is output by the movement amount (△ delta) of the rotary encoder, compatibility cannot be ensured unless all the defined 3 bytes are supported. Table 3.12 shows the standard formats for Saturn pointing devices.

Table 3.12 Saturn Pointing Device Standard Format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Saturn Peripheral ID	0	0	1	0	Data size
1st Data	Y Over	X Over	Y Sign	X Sign	Start	Middle	Right	Left
2nd Data	XD7	XD6	XD5	XD4	XD3	XD2	XD1	XD0
3rd Data	YD7	YD6	YD5	YD4	YD3	YD2	YD1	YD0
4th Data	Extended data
・	Extended data
・	Extended data
nth Data	Extended data

Y Over, X Over

0: X or Y data is valid.

1: Data is overflowing. (Over 255)

Y Sign, X Sign

The data of 0: X and Y are positive values.

The data of 1: X and Y are negative values.

XD7 ~ XD0, YD7 ~ YD0

Absolute value of mouse movement

Start, Middle, Right, Left core buttons

It becomes 1 when the button is pressed.

reference:

Developer's Informaition / STN-44 "Shuttle Mouse Supplementary Explanation"

◆ Keyboard device

It is a device represented by a full keyboard such as that used in personal computers.
The peripheral type is 3H and the data size is 4 bytes.
As a feature of the format, 1st Data has a configuration equivalent to the Mega Drive 3-button PAD. Compatibility can be ensured by building an application so that the application can be controlled with only 1st Data. Table 3.13 shows the standard formats for Saturn keyboard devices.

Table 3.13 Saturn keyboard device standard format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Saturn Peripheral ID	0	0	1	1	Data size
1st Data	Right	Left	Down	Up	Start	A TRG	C TRG	B TRG
2nd Data	R TRG	X TRG	Y TRG	Z TRG	L TRG	Extended data
3rd Data	0	Caps Lock	Num Lock	Scrool Lock	Make	1	1	Break
4th Data	D7	D6	D5	D4	D3	D2	D1	D0
5th Data	Extended data
・	Extended data
・	Extended data
nth Data	Extended data

A TRG, C TRG, B TRG, R TRG, X TRG, Y TRG, Z TRG, L TRG

Right, Left, Down, Up, Start

It becomes 0 when the button is pressed.

The correspondence between each button and the keys on the keyboard is as follows.

button	Corresponding key		button	Corresponding key
Right	→		C TRG	C
Left	←		B TRG	X
Down	↓		R TRG	E
Up	↑		X TRG	A
Start	Esc		Y TRG	S
A TRG	Z		Z TRG	D
L TRG	Q

Caps Lock

1: Caps Lock is locked (Caps Lock LED is lit)

Num Lock

1: Num Lock is locked (Num Lock LED is lit)

Scroll Lock

1: Scroll Lock is locked (Scroll Lock LED is lit)

Make

1 is shown when there is a valid Make code in D7 to D0 (key press indicated by D7 to D0 code).

Break

1 is indicated when there is a valid Break code in D7 to D0 (key press release indicated by the D7 to D0 code).

D7 ~ D0

Indicates the key number. Used with Make and Break.

Key code correspondence table

	0	1	2	3	4	5	6	7	8	9	A	B	C	D	E	F
00H		F9		F5	F3	F1	F2	F12		F10	F8	F6	F4	Tab	Half full
10H		Alt	Shift	Palm	Ctrl	Q	1	Alt	Ctrl		Z	With S	A Chi	W	2
20H		C	X	D	E	4	3		F is	space	V Hi		Is it T?	R	5
30H		N only	B	H	G	Y	6				M too	J	U	7	8
40H		<Ne	K's	To I	O et al.	0	9			＞ Ru	?? eye	L ri	;NS	P	−
50H		_reactor	:hair		@	^			CapsL	Shift	Enter	[[		]nothing
60H					change		Back	Immutable			¥
70H							Esc		F11						ScrL
80H		Ins	Pause	F7	Print	Del	←	Home	End	↑	↓	UP	Down	→

Two key positions

• 11H [Alt key] is on the left side of the keyboard.
• 17H [Alt key] is: Right side.
• 12H [Shift key] is on the left side of the keyboard.
• 59H [Shift key] is: Right side.
• 14H [Ctrl key] is on the left side of the keyboard.
• 18H [Ctrl key] is: Right side.

reference:

Developer's Informaition / STN-45 "Supplementary explanation of Saturn keyboard"