From c2ec03954fd3be8d94686192169a8eef66c228ff Mon Sep 17 00:00:00 2001
From: OBattler <oubattler@gmail.com>
Date: Mon, 5 Aug 2024 01:22:39 +0200
Subject: [PATCH] Implemented B8000/C0000 video RAM access toggle on Tandy 1000
 SX and HX, fixes #4670.

---
 src/machine/m_tandy.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/machine/m_tandy.c b/src/machine/m_tandy.c
index e677ff8b4..6a9308627 100644
--- a/src/machine/m_tandy.c
+++ b/src/machine/m_tandy.c
@@ -1589,6 +1589,10 @@ tandy_write(uint16_t addr, uint8_t val, void *priv)
                 mem_mapping_set_addr(&dev->ram_mapping,
                                      ((val >> 1) & 7) * 128 * 1024, 0x20000);
             }
+            if (val & 0x01)
+                mem_mapping_set_addr(&dev->vid->mapping, 0xc0000, 0x10000);
+            else
+                mem_mapping_set_addr(&dev->vid->mapping, 0xb8000, 0x8000);
             dev->ram_bank = val;
             break;