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--- notes:flashcart:ws_flash_masta [2023/10/14 16:58] – asie
+++ notes:flashcart:ws_flash_masta [2025/06/15 12:07] (current) – [2003 mapper emulation bugs (rev5+)] asie
@@ Line 33: / Line 33: @@
 Description: Configure the visible slot, from 0 to 15.
+===== 2003 mapper emulation bugs (rev5+) =====
+  * RTC port 0xCA always returns either 0x94 (while a command is being processed) or 0x84 (when it is done). It is unknown if anything beyond the "set slot ID" command is emulated.
+  * All other bytes in the 0xC0~0xDF space have all 8 bits writable. Bytes 0xE0~0xFF are not writable and always return 0x00.
+  * Port 0xCF is not a mirror of port 0xC0 and has no effect, though it is set to 0x3F on boot just like byte 0xC0.
+  * Setting bit 0 of port 0xCE disconnects the NOR flash from the ROM bus (memory area 0x20000 - 0xFFFFF returns 0xFF bytes).
+Power on state: ''3F FF FF FF 00 00 00 00 00 00 84 00 00 00 00 3F FF 03 FF 03 FF 03 00 00 00 00 00 00 00 00 00 00''