diff --git a/runtime/src/cdrom.c b/runtime/src/cdrom.c
index f7af055a..c9ea0ebb 100644
--- a/runtime/src/cdrom.c
+++ b/runtime/src/cdrom.c
@@ -286,6 +286,10 @@ static void exec_command(uint8_t cmd) {
     }
 
     param_count = 0;
+
+    /* Fire the CDROM IRQ for the immediate response.
+     * Delayed responses (pending) fire from process_pending(). */
+    fire_cdrom_irq();
 }
 
 static void process_pending(void) {
diff --git a/runtime/src/interrupts.c b/runtime/src/interrupts.c
index b307fb18..3b7ecd17 100644
--- a/runtime/src/interrupts.c
+++ b/runtime/src/interrupts.c
@@ -29,6 +29,7 @@
 #include "sio.h"
 #include "timers.h"
 #include "gpu.h"
+#include "cdrom.h"
 #include "cpu_state.h"
 #include <stdio.h>
 #include <stdlib.h>
@@ -102,6 +103,7 @@ void psx_check_interrupts(CPUState* cpu) {
             i_stat |= (1 << IRQ_VBLANK);
             gpu_vblank_tick();  /* Toggle LCF (GPUSTAT bit 31) */
             timers_tick(33868); /* ~1 NTSC frame worth of cycles */
+            cdrom_tick();      /* Process pending CDROM responses */
         }
     }