diff --git a/firmware/render/render.c b/firmware/render/render.c
index 7691bd0..75ca908 100644
--- a/firmware/render/render.c
+++ b/firmware/render/render.c
@@ -314,7 +314,7 @@ void DELAYED_COPY_CODE(render_loop)()
                     }
                     break;
                 case SOFTSW_HIRES_MODE: //4
-                    if(current_softsw & SOFTSW_DGR)
+                    if((current_softsw & (SOFTSW_80COL | SOFTSW_DGR)) == (SOFTSW_80COL | SOFTSW_DGR))
                     {
                         render_dhgr();
                     }
diff --git a/firmware/render/render_hires.c b/firmware/render/render_hires.c
index 5fa2cfc..6ab986f 100644
--- a/firmware/render/render_hires.c
+++ b/firmware/render/render_hires.c
@@ -91,8 +91,14 @@ static void DELAYED_COPY_CODE(render_hires_line)(bool p2, uint line)
         //                          pixel
         uint oddness = 0;
 
+        // The 'AN3 trick' is used by Prince of Persia and several demos for the IIe.
+        // It relies on setting AN3 but not turning on 80 column mode. This causes a 90 degree
+        // phase shift relative to the color carrier which can be used as a quick palette shift
+        // effect.
+        uint phase_shift = (IS_SOFTSWITCH(SOFTSW_DGR)) ? 1 : 0;
+
         // Load in the first 14 dots
-        uint32_t dots = (uint32_t)hires_dot_patterns[line_mem[0]] << 15;
+        uint32_t dots = (uint32_t)hires_dot_patterns[line_mem[0]] << (15 + phase_shift);
 
         for(uint i=1; i < 41; i++)
         {
@@ -100,9 +106,9 @@ static void DELAYED_COPY_CODE(render_hires_line)(bool p2, uint line)
             uint b = (i < 40) ? line_mem[i] : 0;
             if(b & 0x80) {
                 // Extend the last bit from the previous byte
-                dots |= (dots & (1u << 15)) >> 1;
+                dots |= (dots & (1u << (15 + phase_shift))) >> 1;
             }
-            dots |= (uint32_t)hires_dot_patterns[b] << 1;
+            dots |= (uint32_t)hires_dot_patterns[b] << (1 + phase_shift);
 
             // Consume 14 dots
             for(uint j=0; j < 7; j++)