data specifications

Issue an intoback command

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Title data specifications

Data Peripheral ID data type

Data Name PerId

No 1.1

A data type that indicates a peripheral ID.

Definition value	constant name	explanation
0xF0	PER_ID_NCON_UNKNOWN	Unconnected or non-SMPC-compatible peripherals
0x00	PER_ID_DGT	digital device
0x10	PER_ID_ANL	analog device
0x20	PER_ID_PNT	Pointing device (Mega Drive Mouse)
0x30	PER_ID_KBD	keyboard
0xE0	PER_ID_MD	Mega Drive (3 buttons, 6 buttons)

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Title data specifications

Data Peripheral size data type

Data Name PerSize

No 1.2

A data type that indicates the peripheral size.

Definition value	constant name	explanation
0x0F	PER_SIZE_NCON_15	Not connected or 15 byte device
0x02	PER_SIZE_DGT	digital device
0x05	PER_SIZE_ANL	mission stick
0x08	PER_SIZE_ANL2	Mission stick (2 sticks)
0x06	PER_SIZE_3DPAD	multi controller
0x03	PER_SIZE_STEERING	steering controller
0x03	PER_SIZE_PNT	Pointing device (shuttle mouse)
0x04	PER_SIZE_KBD	keyboard
0x01	PER_SIZE_M3BP	megadrive 3 button pad
0x02	PER_SIZE_M6BP	megadrive 6 button pad

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Title data specifications

Data Intoback type data type

Data Name PerKind

No 1.3

This is a data type that indicates the type of intback.

constant name	explanation
PER_KD_SYS	System data acquisition (excluding time)
PER_KD_PER	Peripheral data acquisition
PER_KD_PERTIM	Peripheral data acquisition + time data acquisition

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Title data specifications

Data Required number of peripherals data type

Data Name PerNum

No 1.4

A data type that indicates the number of required peripherals.

value	meaning
0-31	1P~32P

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Title data specifications

Data System data output data type

Data Name PerGetSys

No 1.5

A data type that indicates system data output.

PerGetSys *data

access macro	mold	explanation
PER_GS_CC(data)	Uint8	cartridge code
PER_GS_AC(data)	Uint8	area code
PER_GS_SS(data)	Uint16	system status
PER_GS_SM(data)	Uint32	SMPC memory
PER_GS_SMPC_STAT(data)	Uint8	SMPC status

The constants and values that can be used in each access macro are shown below.

PER_GS_CC(data)

bit7							bit0
0	0	0	0	0	0	CTR1	CTR0

PER_GS_AC(data)

bit7							bit0
0	0	0	0	ACODE 3	ACODE 2	ACODE 1	ACODE 0

Please refer to the hardware manual for the area indicated by the area code.

reference:

"HARDWARE MANUAL/SMPC User's Manual" INTBACK command

PER_GS_SS(data)

bit position constant	Obtained value
PER_SS_DOTSEL	DOTSEL signal status
PER_SS_SYSRES	SYSRES signal state
PER_SS_MSHNMI	MSHNMI signal state
PER_SS_SNDRES	SNDRES signal status
PER_SS_CDRES	CDRES signal status

Obtained value description

value	meaning
0	OFF
1	ON

PER_GS_SM(data)

This area is commonly used by applications and BOOT ROM.

Definition value	bit position constant	Obtained value
0xF	PER_MSK_LANGU	Linguistic constants (see below)
(0x1<< 8)	PER_MSK_SE	SE(0:ON,1:OFF)
(0x1<< 9)	PER_MSK_STEREO	STEREO or MONO(0:STEREO,1:MONO)
(0x1<< Ten)	PER_MSK_HELP	HELP(0:ON,1:OFF)

language constants

Definition value	constant name	explanation
0x0	PER_ENGLISH	English
0x1	PER_DEUTSCH	German
0x2	PER_FRANCAIS	French
0x3	PER_ESPNOL	Spanish
0x4	PER_ITALIANO	Italian
0x5	PER_JAPAN	Japanese

PER_GS_SMPC_STAT(data)

Definition value	bit position constant	Obtained value
(1<< 6)	PER_SS_RESET	Reset mask status
		0: Reset enable (default)
		1: Reset disabled
(1<< 7)	PER_SS_SETTIME	Time setting status
		0: Time has not been set after SMPC cold reset
		1: Setting the time after SMPC cold reset

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Title data specifications

Data Peripheral data output data type

Data Name PerGetPer

No 1.6

A data type that indicates peripheral data output.

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Title data specifications

Data Multi-tap information

Data Name PerMulInfo

No 1.7

Indicates the connection status of the main unit's peripheral connection terminals.
You can obtain the following information for each terminal.

typedef struct {
    PerMulId id; /* Multitap ID */
    PerMulCon con; /* Number of connectors */
}PerMulInfo;

Example of acquisition:

PerGetPer *per_data;
PerMulInfo *mul_info;
PER_LGetPer(&per_data, &mul_info);
    mul_info[0].id Multi-tap ID of main unit terminal 1
    mul_info[0].con Number of connectors for main unit terminal 1 mul_info[1].id Multi-tap ID for main unit terminal 2
    mul_info[1].con Number of connectors for main unit terminal 2

detail:

• Multi-tap ID

  multi-tap connection	:(00~E0) Symbol undefined
  Not connected or directly connected	:(F0) PER_MID_NCON_ONE
  UNKNOWN device	:(MD-PID) Symbol undefined
  Virtua Gun	:(A0) Symbol undefined

• Number of connectors

  Not connected or UNKNOWN device	:(00) PER_MCON_NCON_UNKNOWN
  direct connection	:(01) Symbol undefined
  Number of connected multi-tap connectors	:(02~0F) Symbol undefined

remarks:

There are currently two types of multi-tap supported:

• Multi-terminal 6 (can connect Saturn peripherals)
  Multitap ID = 10, number of connectors = 06

• Sega Tap (megadrive peripherals can be connected)
  Multitap ID = 00, number of connectors = 04

Device information data type (definition example) and bit position constant

Examples of structure definitions and bit position constants when accessing each peripheral data are shown below.
Please use this as a reference when defining types.

Bit position constants common items

If the bit position constants described below are buttons, their meanings are as follows:

Obtained value description

value	meaning
0	pressing the button
1	button not pressed

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Title data specifications

Data digital device data

Data Name smpDgtData

No 2.1

This is an example of a data type definition that indicates digital device information.

typedef struct { /* digital device */
    PerId id; /* Peripheral type */
    PerSize size; /* Peripheral size */
    Uint16 data; /* Digital device data */
}smpDgtData;

Below are bit position constants for digital devices.

Uint16 data; /* Digital device data type */

BIT position	bit position constant	Obtained value
bit15	PER_DGT_R	Direction key RIGHT
bit14	PER_DGT_L	Directional key LEFT
bit13	PER_DGT_D	Direction key DOWN
bit12	PER_DGT_U	Direction key UP
bit11	PER_DGT_S	START button
bit10	PER_DGT_A	A button
bit9	PER_DGT_C	C button
bit8	PER_DGT_B	B button
bit7	PER_DGT_TR	TRG-RIGHT (located at the top right of the device)
bit6	PER_DGT_X	X button
bit5	PER_DGT_Y	Y button
bit4	PER_DGT_Z	Z button
bit3	PER_DGT_TL	TRG-LEFT (located at the top left of the device)

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Title data specifications

Data analog device data

Data Name smpAnlData

No 2.2

This is an example of defining a data type that indicates analog device information.

typedef struct { /* analog device */
	    PerId id; /* Peripheral type */
    PerSize size; /* Peripheral size */
    Uint16 data; /* Digital data */
    Uint8 x; /* Analog ch0 data (0 to 255) */
    Uint8 y; /* Analog ch1 data (0 to 255) */
    Uint8 r; /* Analog ch2 data (0 to 255) */
    Uint8 l; /* Analog ch3 data (0 to 255) */
}smpAnlData;

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Title data specifications

Data pointing device data

Data Name smpPntData

No 2.3

This is an example of a data type definition that indicates pointing device information.

typedef struct { /* pointing device */
    PerId id; /* Peripheral type */
    PerSize size; /* Peripheral size */
    Uint8 info; /* Overflow, sign information */
    Uint8 x; /* Absolute value of X-axis movement amount (0 to 127) */
    Uint8 y; /* Absolute value of Y-axis movement amount (0 to 127) */
}smpPntData;

Below are the bit position constants that can be used for pointing devices.

Uint8 info; /* Overflow, sign information */

BIT position	bit position constant	Obtained value
bit7	PER_PNT_YO	Y-axis overflow (0: overflow, 1: non-overflow)
bit6	PER_PNT_XO	X-axis overflow (0: overflow, 1: non-overflow)
bit5	PER_PNT_YS	Y-axis sign (0: positive, 1: negative)
bit4	PER_PNT_XS	X-axis sign (0: positive, 1: negative)
bit3	PER_PNT_S	START button
bit2	PER_PNT_MID	center button
bit1	PER_PNT_R	right button
bit0	PER_PNT_L	left button

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Title data specifications

Data keyboard device data

Data Name smpKbdData

No 2.4

This is an example of defining a data type that indicates a keyboard device.

typedef struct { /* keyboard device data */
    PerId id; /* Peripheral type */
    PerSize size; /* Peripheral size */
    PerDgtInfo dgt; /* Digital device data */
    Uint8 skey; /* Special key */
    Uint8 key; /* key */
}smpKbdData;

The constants and values that can be used in each member are shown below.

BIT position	bit position constant	Obtained value
bit6	PER_KBD_CL	Caps Lock
bit5	PER_KBD_NL	Num Lock
bit4	PER_KBD_SL	Scroll Lock
bit3	PER_KBD_MK	Make (0: key pressed, 1: key not pressed)
bit0	PER_KBD_BR	Break (0: key is released, 1: key is not released)

Please refer to the following information for key codes and countermeasures against simultaneous pressing.

reference:

Devloper's Information STN-45 Sega Saturn Keyboard Supplementary Information