From 2731fdc56bba802f50bf6fed99fd439479fce45a Mon Sep 17 00:00:00 2001
From: NewRisingSun <8vytz1+dhp372pv94ebg@sharklasers.com>
Date: Fri, 12 Sep 2025 13:55:05 +0200
Subject: [PATCH] Mapper 280: UNROM-after-reset needs vertical mirroring.

---
 src/boards/280.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/boards/280.c b/src/boards/280.c
index b831be7..afd7d21 100644
--- a/src/boards/280.c
+++ b/src/boards/280.c
@@ -41,6 +41,7 @@ static void Sync(void) {
          setprg16(0x8000, 0x20 | latchData &0x07);
          setprg16(0xC000, 0x27);
       }
+      setmirror(MI_V);
    } else {
       if (latchAddr &0x01)
 	      setprg32(0x8000, latchAddr >>3 &0x0F);
@@ -49,10 +50,10 @@ static void Sync(void) {
 	      setprg16(0xC000, latchAddr >>2 &0x1F);
       }
       if (~latchAddr &0x80) setprg16(0xC000, 0);
+      setmirror(latchAddr &0x02? MI_H: MI_V);
    }
    SetupCartCHRMapping(0, CHRptr[0], 0x2000, ~mode &0x01 && latchAddr &0x80? 0: 1);
    setchr8(0);
-   setmirror(latchAddr &0x02? MI_H: MI_V);
 }
 
 static DECLFW(M280Write) {