Differences

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--- notes:flashcart:r4ds [2023/10/16 14:44] – 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 33: / Line 33: @@
                              | ||          1 - R4 Revolution for DS
                              +-++-------- Sub-language:
-? - Simplified Chinese
+:2  - French
-? - Traditional Chinese
+:4  - Korean
-  - French
+:0? - Simplified Chinese
-  - Korean
+:1? - Traditional Chinese
 </code>
@@ Line 72: / 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 78: / 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 94: / 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) ====