From 70a801a43c16fd7a5f61e8d876e5d5c2db48ebe8 Mon Sep 17 00:00:00 2001
From: Miquel Sabaté Solà <mssola@mssola.com>
Date: Wed, 16 Sep 2026 22:34:56 +0200
Subject: Initial commit
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Signed-off-by: Miquel Sabaté Solà <mssola@mssola.com>
---
 include/apu.s  |  4 ++++
 include/asm.s  |  9 +++++++++
 include/mmc1.s |  5 +++++
 include/oam.s  | 12 ++++++++++++
 include/ppu.s  |  6 ++++++
 5 files changed, 36 insertions(+)
 create mode 100644 include/apu.s
 create mode 100644 include/asm.s
 create mode 100644 include/mmc1.s
 create mode 100644 include/oam.s
 create mode 100644 include/ppu.s

(limited to 'include')

diff --git a/include/apu.s b/include/apu.s
new file mode 100644
index 0000000..8a23c49
--- /dev/null
+++ b/include/apu.s
@@ -0,0 +1,4 @@
+.scope APU
+    m_dmc               = $4010
+    m_frame_counter     = $4017
+.endscope
diff --git a/include/asm.s b/include/asm.s
new file mode 100644
index 0000000..f5d39bc
--- /dev/null
+++ b/include/asm.s
@@ -0,0 +1,9 @@
+;; Pseudo-instruction from 'nasm' that is not available for 'ca65'. An empty
+;; implementation is actually quite accurate, as it's just a way for 'nasm' to
+;; perform extra checks when programmers want to explicitly make the code fall
+;; through.
+.ifndef __NASM__
+    .macro __fallthrough__ arg
+        ;; Nothing to do.
+    .endmacro
+.endif
diff --git a/include/mmc1.s b/include/mmc1.s
new file mode 100644
index 0000000..3a6bc5d
--- /dev/null
+++ b/include/mmc1.s
@@ -0,0 +1,5 @@
+.scope MMC1
+    m_control  = $8000
+    m_chr_bank = $A000
+    m_prg_bank = $E000
+.endscope
diff --git a/include/oam.s b/include/oam.s
new file mode 100644
index 0000000..a73494d
--- /dev/null
+++ b/include/oam.s
@@ -0,0 +1,12 @@
+.scope OAM
+    ;; Region in internal RAM where sprites are being allocated for later use in
+    ;; the DMA process. The entire page is reserved, as there are 64 sprites x 4
+    ;; bytes each = 256 bytes in total.
+    m_sprites = $200            ; asan:reserve $100
+
+    ;;;
+    ;; Actual addresses from OAM space.
+
+    m_address = $2003
+    m_dma     = $4014
+.endscope
diff --git a/include/ppu.s b/include/ppu.s
new file mode 100644
index 0000000..dbef40e
--- /dev/null
+++ b/include/ppu.s
@@ -0,0 +1,6 @@
+.scope PPU
+    m_control = $2000
+    m_mask    = $2001
+    m_status  = $2002
+    m_scroll  = $2005
+.endscope
-- 
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