Disassembly Notes (NES) - Revision history

Dmwit: /* External resources */

2025-02-21T02:34:53Z

External resources

Dmwit: /* External resources */ add nostaljipi's github

2025-01-27T03:34:58Z

External resources: add nostaljipi's github

Dmwit: /* Pill movement */

2023-02-13T18:01:11Z

Pill movement

Dmwit: /* Pill movement */

2023-02-13T01:58:54Z

Pill movement

Dmwit at 01:41, 13 February 2023

2023-02-13T01:41:30Z

Show changes

Dmwit at 19:17, 12 February 2023

2023-02-12T19:17:49Z

Dmwit at 18:56, 12 February 2023

2023-02-12T18:56:15Z

Dmwit at 01:42, 18 August 2020

2020-08-18T01:42:37Z

Dmwit: Created page with "== Demo == If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to `00` 8 times in a row. The frame coun..."

2020-08-18T01:16:36Z

Created page with "== Demo == If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame coun..."

New page

== Demo ==

If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame counter cycles through from <code>00</code>-<code>FF</code>. So this means it takes anywhere from ~29-34 seconds to start ((256 frames * 7 + [1,256] frames) / 60 frames per second). It can be disabled a number of ways, but the simplest way is editing the jump offset (to <code>0</code>) when it decides to load the demo code (at <code>$9905</code>), accomplishable through the Game Genie code <code>AAAPSP</code>. Next, while the demo board is a generatable one (seed <code>03BE</code>), it's stored directly in the ROM (<code>$CF00</code>-<code>$CF7F</code>) and loaded into memory. The capsules generated do not match this seed, but they're stored right after the board (<code>$CF80</code>-<code>$CFFF</code>). The controls are stored in pairs of bytes, the first byte being the buttons pressed (bitmask - A, B, Select, Start, Up, Down, Left, Right) and the second being the number of frames to hold down those buttons. These are stored right after the board/capsules at <code>$D000</code>-<code>$D1FF</code>.

← Older revision		Revision as of 02:34, 21 February 2025
Line 258:		Line 258:

	[https://github.com/Nostaljipi/dr-mario-disassembly Nostaljipi's disassembly notes]		[https://github.com/Nostaljipi/dr-mario-disassembly Nostaljipi's disassembly notes]
		+
		+	[https://datacrystal.tcrf.net/wiki/Dr._Mario_(NES)/ROM_map TCRF's ROM map]

	[[Category:Dr. Mario (NES)]]		[[Category:Dr. Mario (NES)]]

← Older revision		Revision as of 03:34, 27 January 2025
Line 256:		Line 256:

	[https://cdn.discordapp.com/attachments/632225442891431936/1016514981623255040/drmario.mlb miscellaneous Mesen labels]		[https://cdn.discordapp.com/attachments/632225442891431936/1016514981623255040/drmario.mlb miscellaneous Mesen labels]
		+
		+	[https://github.com/Nostaljipi/dr-mario-disassembly Nostaljipi's disassembly notes]

	[[Category:Dr. Mario (NES)]]		[[Category:Dr. Mario (NES)]]

@@ Line 101: / Line 101: @@
                          dec L85_PILL_COLUMN         ; 8E03 C6 85                move left
                          lda #$0F                    ; 8E05 A9 0F
-                         sta L93_REPEAT_TIMER        ; 8E07 85 93                and set the DAS counter to 16.
+                         sta L93_REPEAT_TIMER        ; 8E07 85 93                and set the DAS counter to 15.
                      end_if
                  end_if

← Older revision		Revision as of 01:58, 13 February 2023
Line 6:		Line 6:

	This is all the code responsible for moving the pill each frame. The disassembly and function descriptions are from [https://github.com/brianhuffman/drmario Brian Huffman's disassembly]; this version has added detailed English descriptions of the code. I also did a cursory look through the code for what $06f1 does, but I couldn't find anything obvious that read from that address. So either it's dead code, or it's read via indirect addressing.		This is all the code responsible for moving the pill each frame. The disassembly and function descriptions are from [https://github.com/brianhuffman/drmario Brian Huffman's disassembly]; this version has added detailed English descriptions of the code. I also did a cursory look through the code for what $06f1 does, but I couldn't find anything obvious that read from that address. So either it's dead code, or it's read via indirect addressing.
		+
		+	The input handling deserves a brief comment as well. L5C_INPUT_OLD stores which buttons the user is currently pressing (despite its name suggesting otherwise), one button per bit, in standard controller order, with the bottom bit being the right arrow. L5B_INPUT_NEW has the same shape as L5C_INPUT_OLD, but each bit is set if the corresponding button started being pressed this frame; that is, if it is pressed this frame but was not pressed last frame.

	jsr R8D70_DROP_PILL ; may go to state 1 ; 8D66 20 70 8D		jsr R8D70_DROP_PILL ; may go to state 1 ; 8D66 20 70 8D

← Older revision		Revision as of 19:17, 12 February 2023
Line 4:		Line 4:

	[https://github.com/brianhuffman/drmario Brian Huffman's disassembly notes]		[https://github.com/brianhuffman/drmario Brian Huffman's disassembly notes]
		+
		+	[https://cdn.discordapp.com/attachments/632225442891431936/1016514981623255040/drmario.mlb miscellaneous Mesen labels]

	[[Category:Dr. Mario (NES)]]		[[Category:Dr. Mario (NES)]]

← Older revision		Revision as of 18:56, 12 February 2023
Line 2:		Line 2:

	If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame counter cycles through from <code>00</code>-<code>FF</code>. So this means it takes anywhere from ~29-34 seconds to start ((256 frames * 7 + [1,256] frames) / 60 frames per second). It can be disabled a number of ways, but the simplest way is editing the jump offset (to <code>0</code>) when it decides to load the demo code (at <code>$9905</code>), accomplishable through the Game Genie code <code>AAAPSP</code>. Next, while the demo board is a generatable one (seed <code>03BE</code>), it's stored directly in the ROM (<code>$CF00</code>-<code>$CF7F</code>) and loaded into memory. The capsules generated do not match this seed, but they're stored right after the board (<code>$CF80</code>-<code>$CFFF</code>). The controls are stored in pairs of bytes, the first byte being the buttons pressed (bitmask - A, B, Select, Start, Up, Down, Left, Right) and the second being the number of frames to hold down those buttons. These are stored right after the board/capsules at <code>$D000</code>-<code>$D1FF</code>.		If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame counter cycles through from <code>00</code>-<code>FF</code>. So this means it takes anywhere from ~29-34 seconds to start ((256 frames * 7 + [1,256] frames) / 60 frames per second). It can be disabled a number of ways, but the simplest way is editing the jump offset (to <code>0</code>) when it decides to load the demo code (at <code>$9905</code>), accomplishable through the Game Genie code <code>AAAPSP</code>. Next, while the demo board is a generatable one (seed <code>03BE</code>), it's stored directly in the ROM (<code>$CF00</code>-<code>$CF7F</code>) and loaded into memory. The capsules generated do not match this seed, but they're stored right after the board (<code>$CF80</code>-<code>$CFFF</code>). The controls are stored in pairs of bytes, the first byte being the buttons pressed (bitmask - A, B, Select, Start, Up, Down, Left, Right) and the second being the number of frames to hold down those buttons. These are stored right after the board/capsules at <code>$D000</code>-<code>$D1FF</code>.
		+
		+	[https://github.com/brianhuffman/drmario Brian Huffman's disassembly notes]

	[[Category:Dr. Mario (NES)]]		[[Category:Dr. Mario (NES)]]

← Older revision		Revision as of 01:42, 18 August 2020
Line 2:		Line 2:

	If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame counter cycles through from <code>00</code>-<code>FF</code>. So this means it takes anywhere from ~29-34 seconds to start ((256 frames * 7 + [1,256] frames) / 60 frames per second). It can be disabled a number of ways, but the simplest way is editing the jump offset (to <code>0</code>) when it decides to load the demo code (at <code>$9905</code>), accomplishable through the Game Genie code <code>AAAPSP</code>. Next, while the demo board is a generatable one (seed <code>03BE</code>), it's stored directly in the ROM (<code>$CF00</code>-<code>$CF7F</code>) and loaded into memory. The capsules generated do not match this seed, but they're stored right after the board (<code>$CF80</code>-<code>$CFFF</code>). The controls are stored in pairs of bytes, the first byte being the buttons pressed (bitmask - A, B, Select, Start, Up, Down, Left, Right) and the second being the number of frames to hold down those buttons. These are stored right after the board/capsules at <code>$D000</code>-<code>$D1FF</code>.		If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to <code>00</code> 8 times in a row. The frame counter cycles through from <code>00</code>-<code>FF</code>. So this means it takes anywhere from ~29-34 seconds to start ((256 frames * 7 + [1,256] frames) / 60 frames per second). It can be disabled a number of ways, but the simplest way is editing the jump offset (to <code>0</code>) when it decides to load the demo code (at <code>$9905</code>), accomplishable through the Game Genie code <code>AAAPSP</code>. Next, while the demo board is a generatable one (seed <code>03BE</code>), it's stored directly in the ROM (<code>$CF00</code>-<code>$CF7F</code>) and loaded into memory. The capsules generated do not match this seed, but they're stored right after the board (<code>$CF80</code>-<code>$CFFF</code>). The controls are stored in pairs of bytes, the first byte being the buttons pressed (bitmask - A, B, Select, Start, Up, Down, Left, Right) and the second being the number of frames to hold down those buttons. These are stored right after the board/capsules at <code>$D000</code>-<code>$D1FF</code>.
		+
		+	[[Category:Dr. Mario (NES)]]

Disassembly Notes (NES) - Revision history

Dmwit: /* External resources */

Dmwit: /* External resources */ add nostaljipi's github

Dmwit: /* Pill movement */

Dmwit: /* Pill movement */

Dmwit at 01:41, 13 February 2023

Dmwit at 19:17, 12 February 2023

Dmwit at 18:56, 12 February 2023

Dmwit at 01:42, 18 August 2020

Dmwit: Created page with "== Demo == If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to 00 8 times in a row. The frame coun..."

Dmwit: Created page with "== Demo == If you sit idle on the title screen for a while, a demo plays. It's triggered by the frame counter rolling over to `00` 8 times in a row. The frame coun..."