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- [Supported config options ](#supported-config-options )
- [`0`: **BOOTLOADER\_SWITCH** ](#0-bootloader_switch )
- [`1`: **ROM\_WRITE\_ENABLE** ](#1-rom_write_enable )
- [`2`: **ROM\_SHADOW\_ENABLE** ](#2-rom_shadow_enable )
- [`3`: **DD\_MODE** ](#3-dd_mode )
- [`4`: **ISV\_ADDRESS** ](#4-isv_address )
- [`5`: **BOOT\_MODE** ](#5-boot_mode )
- [`6`: **SAVE\_TYPE** ](#6-save_type )
- [`7`: **CIC\_SEED** ](#7-cic_seed )
- [`8`: **TV\_TYPE** ](#8-tv_type )
- [`9`: **DD\_SD\_ENABLE** ](#9-dd_sd_enable )
- [`10`: **DD\_DRIVE\_TYPE** ](#10-dd_drive_type )
- [`11`: **DD\_DISK\_STATE** ](#11-dd_disk_state )
- [`12`: **BUTTON\_STATE** ](#12-button_state )
- [`13`: **BUTTON\_MODE** ](#13-button_mode )
- [`14`: **ROM\_EXTENDED\_ENABLE** ](#14-rom_extended_enable )
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- [Supported persistent setting options ](#supported-persistent-setting-options )
- [`0`: **LED\_ENABLE** ](#0-led_enable )
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---
## Supported config options
SC64 provides simple flashcart configuration by exposing various options settable by both USB and N64 side.
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All options other than **BOOTLOADER_SWITCH** are preserved on console reset or power cycle (only when powered from USB).
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| id | name | type | description |
| ---- | ----------------------- | ------- | ----------------------------------------------------------------------- |
| `0` | **BOOTLOADER_SWITCH** | *bool* | Switches between bootloader and ROM mapping on PI address `0x1000_0000` |
| `1` | **ROM_WRITE_ENABLE** | *bool* | Enables write access to ROM section |
| `2` | **ROM_SHADOW_ENABLE** | *bool* | Enables overlapping last 128 kiB of ROM section by flash memory |
| `3` | **DD_MODE** | *enum* | Enables 64DD register/IPL access |
| `4` | **ISV_ADDRESS** | *dword* | Sets IS-Viewer 64 watch address |
| `5` | **BOOT_MODE** | *enum* | Controls bootloader behavior |
| `6` | **SAVE_TYPE** | *enum* | Sets supported save type |
| `7` | **CIC_SEED** | *word* | Sets CIC seed value passed by bootloader to IPL3 |
| `8` | **TV_TYPE** | *enum* | Sets TV type value passed by bootloader to IPL3 |
| `9` | **DD_SD_ENABLE** | *bool* | Controls 64DD block request passing to USB or SD card |
| `10` | **DD_DRIVE_TYPE** | *enum* | Sets 64DD drive type |
| `11` | **DD_DISK_STATE** | *enum* | Sets current 64DD disk state |
| `12` | **BUTTON_STATE** | *bool* | Gets button press value |
| `13` | **BUTTON_MODE** | *enum* | Sets button press behavior |
| `14` | **ROM_EXTENDED_ENABLE** | *bool* | Enables access to extended ROM memory located in flash |
---
### `0`: **BOOTLOADER_SWITCH**
type: *bool* | default: `1`
- `0` - ROM data is mapped on PI address `0x1000_0000`
- `1` - Bootloader data is mapped on PI address `0x1000_0000`
Used internally to remap ROM data after bootloader is loaded.
---
### `1`: **ROM_WRITE_ENABLE**
type: *bool* | default: `0`
- `0` - ROM write access is disabled
- `1` - ROM write access is enabled
Used by homebrew applications to freely replace data in SDRAM from N64 side.
---
### `2`: **ROM_SHADOW_ENABLE**
type: *bool* | default: `0`
- `0` - Last 128 kiB of ROM section is mapped to SDRAM
- `1` - Last 128 kiB of ROM section is mapped to flash
Last 128 kiB of SDRAM is shared between ROM data and SRAM/FlashRAM save data.
Use this setting for applications requiring all of ROM section space including last 128 kiB.
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Check [PI memory map ](./01_memory_map.md#pi-memory-map ) for more information.
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---
### `3`: **DD_MODE**
type: *enum* | default: `0`
- `0` - 64DD support is disabled
- `1` - 64DD registers are mapped on PI address space
- `2` - 64DD IPL is mapped on PI address space
- `3` - Both 64DD registers and IPL are mapped on PI address space
Use this config for setting level of 64DD emulation.
---
### `4`: **ISV_ADDRESS**
type: *dword* | default: `0x0000_0000`
- `0x0000_0000` - IS-Viewer 64 is disabled
- `0x0000_0004` to `0x03FF_FFFC` - IS-Viewer 64 is enabled
Sets IS-Viewer 64 listening address starting from ROM base.
For most applications this offset is fixed at `0x03FF_0000` .
Address must be 4-byte aligned. Command will return error when setting incorrect value.
Small number of games have support for changing this address (for example debug builds of TLoZ: MM).
---
### `5`: **BOOT_MODE**
type: *enum* | default: `0`
- `0` - Load menu from SD card
- `1` - Attempt to boot application loaded in ROM section
- `2` - Attempt to boot 64DD IPL
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- `3` - Direct ROM mode, skips bootloader entirely
- `4` - Direct 64DD IPL mode, skips bootloader entirely
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Use this setting to change boot behavior.
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Value `3` or `4` (direct boot) will always keep **BOOTLOADER_SWITCH** option disabled.
Value `4` will set CIC emulation to 64DD mode
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---
### `6`: **SAVE_TYPE**
type: *enum* | default: `0`
- `0` - All saves are disabled
- `1` - EEPROM 4 kib save is enabled
- `2` - EEPROM 16 kib save is enabled
- `3` - SRAM 256 kib save is enabled
- `4` - FlashRAM 1 Mib save is enabled
- `5` - SRAM 768 kib save is enabled
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- `6` - SRAM 1 Mib save is enabled
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Use this setting for selecting save type that will be emulated. Only one save type can be enabled.
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Any successful write to this config will disable automatic save writeback to USB or SD card when previously enabled.
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---
### `7`: **CIC_SEED**
type: *word* | default: `0xFFFF`
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- `0x0000` to `0x00FF` - Specified CIC seed value will be used
- `0xFFFF` - CIC seed value will be autodetected
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Use this setting to force specific CIC seed.
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By setting value `0xFFFF` bootloader will try to guess needed values from loaded ROM IPL3.
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This setting is not used when **BOOT_MODE** is set to `3` or `4` (direct boot).
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---
### `8`: **TV_TYPE**
type: *enum* | default: `3`
- `0` - PAL TV type will be used
- `1` - NTSC TV type will be used
- `2` - MPAL TV type will be used
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- `3` - Console native TV type will be used
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Use this setting to force specific TV type.
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By setting value `3` bootloader will passthrough TV type native to the console.
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This setting is not used when **BOOT_MODE** is set to `3` or `4` (direct boot).
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---
### `9`: **DD_SD_ENABLE**
type: *bool* | default: `0`
- `0` - 64DD block requests are passed to USB interface
- `1` - 64DD block requests are passed to SD card
Use this setting to change where 64DD emulation will be passing incoming block R/W requests.
---
### `10`: **DD_DRIVE_TYPE**
type: *enum* | default: `0`
- `0` - Retail 64DD drive type ID is selected
- `1` - Development 64DD drive type ID is selected
Use this setting to change 64DD drive type emulation.
---
### `11`: **DD_DISK_STATE**
type: *enum* | default: `0`
- `0` - 64DD disk state is set to ejected
- `1` - 64DD disk state is set to inserted
- `2` - 64DD disk state is set to changed
Use this setting to change 64DD current disk state.
---
### `12`: **BUTTON_STATE**
type: *bool* | default: `x` | **read-only**
- `0` - Button is not pressed
- `1` - Button is pressed
This is special read-only option for getting button press state.
Setting this option will return error.
---
### `13`: **BUTTON_MODE**
type: *enum* | default: `0`
- `0` - Button press does nothing
- `1` - Button press raises N64 interrupt
- `2` - Button press sends USB packet
- `3` - Button press changes 64DD disk
Use this setting to change button behavior.
Regardless of this setting button state can always be checked by reading **BUTTON_STATE** config.
---
### `14`: **ROM_EXTENDED_ENABLE**
type: *bool* | default: `0`
- `0` - ROM extended PI access is disabled
- `1` - ROM extended PI access is enabled
Use this setting to enable PI access for extended ROM data located inside flash memory.
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---
## Supported persistent setting options
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These options are similar to config options but state is persisted through power cycles. Setting are kept in RTC backup memory and require battery to be installed for correct operation.
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| id | name | type | description |
| --- | -------------- | ------ | --------------------------------------------- |
| `0` | **LED_ENABLE** | *bool* | Enables or disables LED I/O activity blinking |
---
### `0`: **LED_ENABLE**
type: *bool* | default: `1`
- `0` - LED I/O activity blinking is disabled
- `1` - LED I/O activity blinking is enabled
Use this setting to enable or disable LED I/O activity blinking.