From 47896a18f81802501fa60e98433846b8340f1e51 Mon Sep 17 00:00:00 2001
From: notaz <notasas@gmail.com>
Date: Mon, 27 Oct 2014 23:12:46 +0200
Subject: [PATCH] megaed-sv: first somewhat working sync code

---
 megaed-sv/asmtools.s | 47 +++++++++++++++++++++++++++++++++++++++-----
 megaed-sv/main.c     |  7 +++----
 2 files changed, 45 insertions(+), 9 deletions(-)

diff --git a/megaed-sv/asmtools.s b/megaed-sv/asmtools.s
index 89eb3d0..ff780a9 100644
--- a/megaed-sv/asmtools.s
+++ b/megaed-sv/asmtools.s
@@ -246,6 +246,7 @@ run_game:
     moveq.l     #0x00, d0
     move.b      #0x40, d1     /* d2 is tmp */
     move.b      #0xff, d3
+    moveq.l     #0x00, d5     /* progress cnt */
     move.b      d1, (0x09,a6) /* CtrlA */
     move.b      d0, (0x0b,a6) /* CtrlB */
     move.b      d0, (0x0d,a6) /* CtrlC */
@@ -256,9 +257,6 @@ run_game:
     move.b      d0, (0x1f,a6) /* S-CtrlC */
     move.b      d3, (0x1b,a6) /* TxDataC */
 
-    /* set up for vram write */
-    move.l      #0x40000000, (a3)
-
     move.l      #0xff0000, a1
     move.l      #0x10000/4/4-1, d2
 0:
@@ -276,14 +274,24 @@ run_game:
     dbra        d2, 0b
 
     tst.l       d6
-    beq.s       0f
+    beq.s       sync_hvc
 
     movea.l     #0xa10003, a0
     movea.l     d0, a7
     bsr         sync_with_teensy  /* trashes d3 */
     move.l      d0, (-4,a7)
 
-0:
+sync_hvc:
+    /* set up for progress vram write (x,y - tile #) */
+    /* GFX_WRITE_VRAM_ADDR(0xc000 + (x + 64 * y) * 2) */
+    /* d = d5 + '0' - 32 + 0xB000/32 - 128 = d5 + 0x510 */
+    moveq.l #0, d5
+    move.l      #(0x40000003 | ((36 + 64*1) << 17)), (a3)
+    add.w       #0x510, d5
+    move.w      d5, (a5)
+    move.w      #('/'+0x4e0), (a5)
+    move.w      #('6'+0x4e0), (a5)
+
     /* wait for active display */
     moveq.l     #3, d2
 0:
@@ -298,6 +306,35 @@ run_game:
     move.w      d0, (a5)
 .endr
 
+    movea.l     #0xc00008, a1
+    movea.l     #0xc00008, a1
+    btst.b      #7, (0xa10001)
+    bne         sync_hvc_pal
+
+    move.l      (a1), d3
+    cmp.l       #0xff1fff21, d3
+    bne.s       sync_hvc
+    move.l      (a1), d3
+    cmp.l       #0xff2eff2f, d3
+    bne.s       sync_hvc
+    move.l      (a1), d3
+    cmp.l       #0xff3dff3f, d3
+    bne.s       sync_hvc
+    /* move.l      (a1), d3  -> #0xff4cff4e */
+
+    move.w      d0, (-2,a7)
+
+    move.l      (a1), d3
+    cmp.l       #0xff53ff55, d3
+    bne.s       sync_hvc
+    move.l      (a1), d3
+    cmp.l       #0xff62ff63, d3
+    bne.s       sync_hvc
+
+sync_hvc_pal:
+    /* TODO */
+
+0:
     movea.l     d0, a0
     movea.l     #0xA13000, a1
 
diff --git a/megaed-sv/main.c b/megaed-sv/main.c
index 24a2528..1b2359a 100644
--- a/megaed-sv/main.c
+++ b/megaed-sv/main.c
@@ -515,7 +515,7 @@ static int do_run(OsRoutine *ed, u8 b3, int tas_sync)
         return -1;
     }
 
-    printf("starting mapper %x..\n", mapper);
+    printf("syncing and starting mapper %x..\n", mapper);
 
     while (read16(GFX_CTRL_PORT) & 2)
         ;
@@ -584,9 +584,8 @@ int main()
     /* note: relying on ED menu's font setup here.. */
 
     printf("\n");
-    printf("version: %02x, hvc: %04x %04x, zbus: %d\n",
-           read8(0xa10001), start_hvc, read16(GFX_CTRL_PORT),
-           read8(0xa11100) & 1);
+    printf("version: %02x, hvc: %04x %04x\n",
+           read8(0xa10001), start_hvc, read16(0xc00008));
     printf("ED os/fw: %d/%d\n\n", ed->osGetOsVersion(),
            ed->osGetFirmVersion());
 
-- 
2.39.5