Differences

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--- notes:flashcart:r4ds [2023/10/16 14:28] – asie
+++ notes:flashcart:r4ds [2023/10/16 15:03] (current) – asie
@@ Line 1: / Line 1: @@
 ====== 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 =====
@@ Line 17: / Line 17: @@
 <code>
                  bit                 0
- ???? ???? ???? ???? ???? ???m mmmm msss
+ ???? ???? ???? ???? ???? ???L LLml lsss
                              | |||| ||||
                              | |||| |+++- Initialization status:
@@ Line 25: / Line 25: @@
                              | |||| |      3 - could not find _DS_MENU.DAT
                              | |||| |      4 - success
-                             +-++++-+---- Model (maybe only top four bits?):
+                             | |||+-+---- Language:
-x3A - M3DS Simply
+                             | |||         1 - Japanese
-x3E - R4 Revolution for DS
+                             | |||         2 - English
+                             | |||         3 - Chinese
+                             | ||+------- Model:
+                             | ||          0 - M3DS Simply
+                             | ||          1 - R4 Revolution for DS
+                             +-++-------- Sub-language:
+:2  - French
+:4  - Korean
+:0? - Simplified Chinese
+:1? - Traditional Chinese
 </code>
@@ Line 63: / Line 72: @@
 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) ====
@@ Line 69: / Line 82: @@
   * (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) ====
@@ Line 85: / Line 98: @@
   * (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) ====