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notes:flashcart:r4ds [2023/10/16 14:43] – asienotes:flashcart:r4ds [2023/10/16 15:03] (current) – asie
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 ====== R4 (NDS) programming ====== ====== R4 (NDS) programming ======
  
-Original research provided mostly by lifehackerhansol.+Original research provided mostly [[https://github.com/DS-Homebrew/DLDI/wiki/Original-R4-and-M3-Simply|by lifehackerhansol]].
  
 ===== Control flags ===== ===== Control flags =====
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                              | |||         1 - Japanese                              | |||         1 - Japanese
                              | |||         2 - English                              | |||         2 - English
-                             | |||         3 - Simplified Chinese+                             | |||         3 - Chinese
                              | ||+------- Model:                              | ||+------- Model:
                              | ||          0 - M3DS Simply                              | ||          0 - M3DS Simply
                              | ||          1 - R4 Revolution for DS                              | ||          1 - R4 Revolution for DS
                              +-++-------- Sub-language:                              +-++-------- Sub-language:
-                                           1 - Traditional Chinese +                                           2:2  - French 
-                                           2 - French +                                           2:4  - Korean 
-                                           4 - Korean+                                           3:0? - Simplified Chinese 
 +                                           3:1? - Traditional Chinese
 </code> </code>
  
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 SD read data, but using the "ROM" FAT entry table. SD read data, but using the "ROM" FAT entry table.
  
-==== ? Get card ID ? (B8 00 00 00 00 00 00 00) ====+==== Get card ID (B8 00 00 00 00 00 00 00) ==== 
 + 
 +[[https://github.com/DS-Homebrew/DLDI/wiki/Original-R4-and-M3-Simply#original-r4--m3-ds-simply|Quoting lifehackerhansol]]: 
 + 
 +> Card ID commands are not patched and use the timings from the retail game ROM header, but without L1 latency (that's what the SDK does). Those can be as fast as a single cycle of L2 latency, depending on the game.
  
 ==== SD read request (B9 sd sc sb sa 00 00 00) ==== ==== SD read request (B9 sd sc sb sa 00 00 00) ====
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   * (MSB) sd sc sb sa (LSB) - sector address, in bytes   * (MSB) sd sc sb sa (LSB) - sector address, in bytes
  
-Returns zero when data is ready to access, non-zero if ongoing.+Returns ''0x00000000'' when data is ready to access, ''0x00000001'' if ongoing.
  
 ==== SD read data (BA 00 00 00 00 00 00 00) ==== ==== SD read data (BA 00 00 00 00 00 00 00) ====
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   * (MSB) sd sc sb sa (LSB) - sector address, in bytes   * (MSB) sd sc sb sa (LSB) - sector address, in bytes
  
-Returns zero if done, non-zero if ongoing.+Returns ''0x00000000'' when data is ready to access, ''0x00000001'' if ongoing.
  
 ==== Save write start (BD sd sc sb sa 00 00 00) ==== ==== Save write start (BD sd sc sb sa 00 00 00) ====
notes/flashcart/r4ds.1697467420.txt.gz · Last modified: by asie