diff --git a/src/include/86box/hdc_ide.h b/src/include/86box/hdc_ide.h
index d6914b905..8f1b3551a 100644
--- a/src/include/86box/hdc_ide.h
+++ b/src/include/86box/hdc_ide.h
@@ -19,6 +19,18 @@
 #ifndef EMU_IDE_H
 # define EMU_IDE_H
 
+#define HDC_PRIMARY_BASE    0x01F0
+#define HDC_PRIMARY_SIDE    0x03F6
+#define HDC_PRIMARY_IRQ	    14
+#define HDC_SECONDARY_BASE  0x0170
+#define HDC_SECONDARY_SIDE  0x0376
+#define HDC_SECONDARY_IRQ   15
+#define HDC_TERTIARY_BASE   0x0168
+#define HDC_TERTIARY_SIDE   0x036E
+#define HDC_TERTIARY_IRQ    10
+#define HDC_QUATERNARY_BASE 0x01E8
+#define HDC_QUATERNARY_SIDE 0x03EE
+#define HDC_QUATERNARY_IRQ  11
 
 enum
 {