From da4148881e4308879b30864a30c76e264575df86 Mon Sep 17 00:00:00 2001
From: kub <derkub@gmail.com>
Date: Sun, 24 Mar 2024 17:45:10 +0100
Subject: [PATCH] sms, fix save/load bugs (irq, mapper)

---
 pico/sms.c   | 5 +++++
 pico/state.c | 9 +++++----
 pico/z80if.c | 5 +++--
 3 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/pico/sms.c b/pico/sms.c
index 615ba36e..6b1425b2 100644
--- a/pico/sms.c
+++ b/pico/sms.c
@@ -795,6 +795,9 @@ void PicoMemSetupMS(void)
 void PicoStateLoadedMS(void)
 {
   u8 mapper = Pico.ms.mapper;
+  u8 zram_dff0[16]; // TODO xwrite also writes to zram :-/
+
+  memcpy(zram_dff0, PicoMem.zram+0x1ff0, 16);
   if (mapper == PMS_MAP_8KBRAM || mapper == PMS_MAP_32KBRAM) {
     u16 a = Pico.ms.carthw[0] << 12;
     xwrite(a, *(unsigned char *)(PicoMem.vram+0x4000));
@@ -828,6 +831,7 @@ void PicoStateLoadedMS(void)
     xwrite(0xfffe, Pico.ms.carthw[0x0e]);
     xwrite(0xffff, Pico.ms.carthw[0x0f]);
   }
+  memcpy(PicoMem.zram+0x1ff0, zram_dff0, 16);
 }
 
 void PicoFrameMS(void)
@@ -868,6 +872,7 @@ void PicoFrameMS(void)
     switch (is_pal ? -lines_vis : lines_vis) {
     case  192: if (y > 218) pv->v_counter = y - (lines-256); break;
     case  224: if (y > 234) pv->v_counter = y - (lines-256); break;
+/*  case  240: if (y > 252) pv->v_counter = y - (lines-256); break; ? */
     case -192: if (y > 242) pv->v_counter = y - (lines-256); break;
     case -224: if (y > 258) pv->v_counter = y - (lines-256); break;
     case -240: if (y > 266) pv->v_counter = y - (lines-256); break;
diff --git a/pico/state.c b/pico/state.c
index 635c95d2..bd801b15 100644
--- a/pico/state.c
+++ b/pico/state.c
@@ -605,12 +605,13 @@ readend:
     Pico32xStateLoaded(0);
   if (PicoIn.AHW & PAHW_MCD)
     pcd_state_loaded();
+  if (!(PicoIn.AHW & PAHW_SMS)) {
+    Pico.video.status &= ~(SR_VB | SR_F);
+    Pico.video.status |= ((Pico.video.reg[1] >> 3) ^ SR_VB) & SR_VB;
+    Pico.video.status |= (Pico.video.pending_ints << 2) & SR_F;
+  }
 
   Pico.m.dirtyPal = 1;
-  Pico.video.status &= ~(SR_VB | SR_F);
-  Pico.video.status |= ((Pico.video.reg[1] >> 3) ^ SR_VB) & SR_VB;
-  Pico.video.status |= (Pico.video.pending_ints << 2) & SR_F;
-
   retval = 0;
 
 out:
diff --git a/pico/z80if.c b/pico/z80if.c
index 6243675c..558607c6 100644
--- a/pico/z80if.c
+++ b/pico/z80if.c
@@ -209,7 +209,7 @@ void z80_pack(void *data)
     s->iff1 = !!zIFF1;
     s->iff2 = !!zIFF2;
     s->im = zIM;
-    s->irq_pending = (Cz80_Get_Reg(&CZ80, CZ80_IRQ) == HOLD_LINE);
+    s->irq_pending = (Cz80_Get_Reg(&CZ80, CZ80_IRQ) != CLEAR_LINE);
     s->irq_vector[0] = 0xff;
   }
 #endif
@@ -276,7 +276,8 @@ int z80_unpack(const void *data)
     Cz80_Set_Reg(&CZ80, CZ80_IFF1, s->iff1);
     Cz80_Set_Reg(&CZ80, CZ80_IFF2, s->iff2);
     zIM = s->im;
-    Cz80_Set_Reg(&CZ80, CZ80_IRQ, s->irq_pending ? HOLD_LINE : CLEAR_LINE);
+    Cz80_Set_Reg(&CZ80, CZ80_IRQ, s->irq_pending ? ASSERT_LINE : CLEAR_LINE);
+    Cz80_Set_IRQ(&CZ80, 0, Cz80_Get_Reg(&CZ80, CZ80_IRQ));
     return 0;
   }
 #else
-- 
2.39.5