STN-50

Twin Stick User's Manual Ver0.90

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Contents

■Summary

The Twin Stick is a new peripheral for the Sega Saturn that is modeled after the control panel of the Sega arcade game ``Cyber Troopers Virtual-On''. The external appearance consists of a start button and two sticks, and each stick has one trigger and one button.
The trigger is operated with the index finger, and the button is operated with the thumb. Also, the start button is located at the back left of the base unit.
(See attached materials)

■Peripheral specifications

●Hardware 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 twin stick levers and buttons is as follows.

table 1. Key compatibility table with standard pads

left stick		right stick
Compatible key (twin)	Button name (standard)	Compatible key (twin)	Button name (standard)
trigger	L button	trigger	A button
button	R button	button	C button
↑(Top)	up key	↑(Top)	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 written as the button name of the standard pad.

■Supported peripheral character code

Write “J” in “Corresponding peripheral (starting address: 50H)” in SYSTEM ID. This is the same code as the Sega Saturn standard pad.

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

“J△△△△△△△△△△△△△△△” “△” = Space (20H)

●About filling out the ROM delivery note

There is no twin stick compatible column in the compatible peripherals column on the ROM delivery slip, so please write "twin stick compatible" in the notes 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

When the button is pressed, it becomes "0"

・Right, Left, Down, Up

Left stick lever (right, left, bottom, top)

・LTRG

Left stick trigger

・RTRG

It's the left stick button

・ZTRG, XTRG, BTRG, YTRG

Right stick lever (right, left, bottom, top)

・ATRG

Right stick trigger

・CTRG

It's the button on the right stick

The 3 bits from bit2 to bit0 of 2nd Data are extended data and should not be used in applications.

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

■Notes on creating twin-stick compatible applications

●1. Distinguishing it from the Saturn standard pad

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

＜ Recommended specifications＞

In order to distinguish between standard putts and twin sticks, we recommend adding a peripheral selection item to be used by the user on the option setting screen.

●2. About the soft reset function

The soft reset operation with twin sticks is defined as follows:

＜ operation＞

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

If any of the above four keys are pressed, please program it to perform a soft reset. Please follow the "Software Creation Standards/Reset" for the software reset specifications.

●3. Regarding measures against simultaneous pressing in four directions

For applications that support twin sticks, programs must be created that take into account not only the left stick but also the simultaneous presses of the right stick's up and down keys and left and right keys.

＜ Situation where the right stick is pressed simultaneously＞

When the key configuration setting is "Twin stick mode" and the actually connected peripheral is "Standard pad"

Press “Y button” and “B button” on standard pad at the same time → press up and down at the same time

Press the "X button" and "Z button" on the standard pad at the same time → press the left and right buttons at the same time

occurs. Therefore, when creating an application, be careful not to cause the application to hang up or behave abnormally in response to such input.

■Twin stick external view