STN-50

Twin Stick User's Manual Ver0.90

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Contents

■ Overview

Twin Stick is a new peripheral for Sega Saturn that imitates the control panel of the Sega arcade game "Cyber Troopers Virtual-On". The appearance consists of a start button and two sticks, and each stick has one trigger and one button.
The trigger is the operation position with the index finger, and the button is the operation position with the thumb. In addition, the position of the start button is the position on the far left of the base unit.
(Refer to the attached document)

■ Peripheral specifications

● Hard specifications

The twin stick peripheral specifications are the same as the Sega Saturn standard pad.

● Key layout

The correspondence between the Sega Saturn standard pad and the twin stick levers and buttons is as follows.

table 1. Key compatibility table with standard pad

Left stick		Right stick
Corresponding key (twin)	Button name (standard)	Corresponding key (twin)	Button name (standard)
Trigger	L button	Trigger	A button
button	R button	button	C button
↑ (above)	Up key	↑ (above)	Y button
↓ (bottom)	Down key	↓ (bottom)	B button
→ (Right)	Right key	→ (Right)	Z button
← (left)	Left key	← (left)	X button

Note: The button name is the standard pad button name.

■ Corresponding peripheral character code

Describe "J" in "Corresponding peripheral (start address: 50H)" in SYSTEM ID. This is the same code as the Sega Saturn standard putt.

Example: When using Sega Saturn standard pad + twin stick.

"J △△△△△△△△△△△△△△△" "△" = space (20H)

● About filling in the ROM delivery note

There is no twin stick compatible column in the compatible peripheral device column of the ROM delivery note, so enter "twin stick compatible" in the remarks column.

■ Twin stick data format

The data format is the same as the Sega Saturn standard pad.

Digital mode data format

	bit7	bit6	bit5	bit4	bit3	bit2	bit1	bit0
Peripheral ID	0	0	0	0	0	0	1	0
1st data	Right	Left	Down	Up	Start	ATRG	CTRG	BTRG
2nd data	RTRG	XTRG	YTRG	ZTRG	LTRG	1	1	1

● Saturn Peripheral ID = 02H

Saturn peripheral type ...	0H (digital device)
Data size··········	2H (2 bytes)

● Explanation of each data

Right, Left, Down, Up, Start, ATRG, CTRG, BTRG, RTRG, XTRG, YTRG, ZTRG, LTRG

It becomes "0" when the button is pressed.

・ Right, Left, Down, Up

Left stick lever (right, left, down, up)

・ LTRG

Left stick trigger

・ RTRG

Left stick button

・ ZTRG, XTRG, BTRG, YTRG

Right stick lever (right, left, down, up)

・ ATRG

Right stick trigger

・ CTRG

Right stick button

Do not use the 3 bits of bit2 to bit0 of 2nd Data in the application because they are extended data.

(Although it is "1" in the data format, do not program to expect "1" and mask this data before use.)

■ Precautions for creating twin stick compatible applications

● 1. Discrimination from Saturn standard pad

Since this peripheral is electrically equivalent to the standard pad, it cannot be automatically determined from the application.

<Recommended specifications>

It is recommended to add the peripheral selection item used by the user on the option setting screen to distinguish the standard putt / twin stick.

● 2. About soft reset function

The soft reset operation with the twin stick is defined as follows.

<Operation>

・ Right stick “↓” (pull the lever toward you)	: (Compatible with B button on standard pad)
・ Right stick trigger on	: (Compatible with A button on standard pad)
・ Right stick button on	: (Compatible with C button on standard pad)
＋
・ Press the start button	: (Corresponds to the START button on the standard pad)

If the above four keys are pressed, program to perform a soft reset. For soft reset specifications, refer to "Software Creation Standards / Reset".

● 3. About measures against simultaneous pushing in four directions

In a twin stick compatible application, it is necessary to create a program considering not only the left stick but also the up and down keys and the left and right keys of the right stick at the same time.

<Situation where simultaneous pressing occurs with the right stick>

When the key config setting is "twin stick mode" and the actually connected peripheral is "standard pad"

Simultaneous pressing of "Y button" and "B button" of standard pad → Simultaneous pressing up and down

Simultaneous pressing of "X button" and "Z button" of standard pad → Simultaneous pressing of left and right

Will occur. However, when creating an application, be careful not to cause hangs or abnormal behavior even for such inputs.

■ Twin stick external view