From f53a7cce328a1e53782578d05aa93476a7296b91 Mon Sep 17 00:00:00 2001
From: joevt <joevt@shaw.ca>
Date: Sat, 4 May 2024 22:49:42 -0700
Subject: [PATCH] appleramdac: Fix clock divisor 1x.

If bits 6 and 7 are 3, then the divisor should be 1 instead of 16.
0 -> 2x
1 -> 4x
2 -> 8x
3 -> 1x (not 16x).
This change affects RGB 12 inch dislay 512 x 384 60Hz mode in Platinum.
---
 devices/video/appleramdac.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/devices/video/appleramdac.cpp b/devices/video/appleramdac.cpp
index 8789c92..1b0016e 100644
--- a/devices/video/appleramdac.cpp
+++ b/devices/video/appleramdac.cpp
@@ -168,7 +168,7 @@ void AppleRamdac::iodev_write(uint32_t address, uint16_t value) {
 }
 
 int AppleRamdac::get_clock_div() {
-    return 1 << ((dac_cr >> 6) + 1);
+    return 1 << (((dac_cr >> 6) + 1) & 3);
 }
 
 int AppleRamdac::get_pix_width() {