diff --git a/src/core/bus/GamePak.zig b/src/core/bus/GamePak.zig
index 43667ef..ed90aba 100644
--- a/src/core/bus/GamePak.zig
+++ b/src/core/bus/GamePak.zig
@@ -6,6 +6,8 @@ const Bit = @import("bitfield").Bit;
 const Bitfield = @import("bitfield").Bitfield;
 const Backup = @import("backup.zig").Backup;
 const Allocator = std.mem.Allocator;
+
+const force_rtc = @import("../emu.zig").force_rtc;
 const log = std.log.scoped(.GamePak);
 
 const Self = @This();
@@ -23,7 +25,7 @@ pub fn init(allocator: Allocator, cpu: *Arm7tdmi, rom_path: []const u8, save_pat
     const file_buf = try file.readToEndAlloc(allocator, try file.getEndPos());
     const title = file_buf[0xA0..0xAC].*;
     const kind = Backup.guessKind(file_buf);
-    const device = guessDevice(file_buf);
+    const device = if (force_rtc) .Rtc else guessDevice(file_buf);
 
     logHeader(file_buf, &title);
 
diff --git a/src/core/emu.zig b/src/core/emu.zig
index 6040d61..3559efd 100644
--- a/src/core/emu.zig
+++ b/src/core/emu.zig
@@ -18,6 +18,7 @@ const sync_video: RunKind = .LimitedFPS; // Configure Video Sync
 pub const win_scale = 3; // 1x, 2x, 3x, etc. Window Scaling
 pub const cpu_logging = false; // Enable detailed CPU logging
 pub const allow_unhandled_io = true; // Only relevant in Debug Builds
+pub const force_rtc = false;
 
 // 228 Lines which consist of 308 dots (which are 4 cycles long)
 const cycles_per_frame: u64 = 228 * (308 * 4); //280896