From 05d2acaeb2873a9cb2b38ccf2d592328cf775023 Mon Sep 17 00:00:00 2001
From: kub <derkub@gmail.com>
Date: Wed, 5 Jul 2023 19:54:40 +0000
Subject: [PATCH] mcd, fix audio crash after end of last track

---
 pico/cd/cdd.c    | 15 ++++++++-------
 pico/cd/mcd.c    |  2 +-
 pico/cd/memory.c |  2 +-
 3 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/pico/cd/cdd.c b/pico/cd/cdd.c
index 6e510c2c..a3c3c93a 100644
--- a/pico/cd/cdd.c
+++ b/pico/cd/cdd.c
@@ -700,6 +700,13 @@ void cdd_update(void)
   /* reading disc */
   if (cdd.status == CD_PLAY)
   {
+    if (cdd.index >= cdd.toc.last)
+    {
+      /* end of disc */
+      cdd.status = CD_END;
+      return;
+    }
+
     /* track type */
     if (!is_audio(cdd.index))
     {
@@ -714,7 +721,7 @@ void cdd_update(void)
       /* data track sector read is controlled by CDC */
       cdd.lba += cdc_decoder_update(header);
     }
-    else if (cdd.index < cdd.toc.last)
+    else
     {
       uint8 header[4] = { 0, };
 
@@ -731,12 +738,6 @@ void cdd_update(void)
       /* next audio block is automatically read */
       cdd.lba++;
     }
-    else
-    {
-      /* end of disc */
-      cdd.status = CD_END;
-      return;
-    }
 
     /* check end of current track */
     if (cdd.lba >= cdd.toc.tracks[cdd.index].end)
diff --git a/pico/cd/mcd.c b/pico/cd/mcd.c
index 2943f431..c9a4e6a9 100644
--- a/pico/cd/mcd.c
+++ b/pico/cd/mcd.c
@@ -57,7 +57,7 @@ PICO_INTERNAL void PicoPowerMCD(void)
   Pico_mcd->m.state_flags = PCD_ST_S68K_RST;
   Pico_mcd->m.busreq = 2;     // busreq on, s68k in reset
   Pico_mcd->s68k_regs[3] = 1; // 2M word RAM mode, m68k access
-  if (Pico.romsize <= 0x20000)
+  if (Pico.romsize <= 0x20000) // hack to detect BIOS, no GA HINT vector for MSU
     memset(Pico.rom + 0x70, 0xff, 4);
 }
 
diff --git a/pico/cd/memory.c b/pico/cd/memory.c
index 4aa1abc4..ac42b8c5 100644
--- a/pico/cd/memory.c
+++ b/pico/cd/memory.c
@@ -1235,8 +1235,8 @@ PICO_INTERNAL void PicoMemSetupCD(void)
     // MSU cartridge. Fake BIOS detection
     cpu68k_map_set(m68k_read8_map,   0x400000, 0x41ffff, PicoReadM68k8_bios, 1);
     cpu68k_map_set(m68k_read16_map,  0x400000, 0x41ffff, PicoReadM68k16_bios, 1);
-  // RAM cart
   } else {
+    // RAM cart
     cpu68k_map_set(m68k_read8_map,   0x400000, 0x7fffff, PicoReadM68k8_ramc, 1);
     cpu68k_map_set(m68k_read16_map,  0x400000, 0x7fffff, PicoReadM68k16_ramc, 1);
     cpu68k_map_set(m68k_write8_map,  0x400000, 0x7fffff, PicoWriteM68k8_ramc, 1);
-- 
2.39.5