diff --git a/sys/pc98/i386/machdep.c b/sys/pc98/i386/machdep.c
index 591503b0722b..1918878b68e5 100644
--- a/sys/pc98/i386/machdep.c
+++ b/sys/pc98/i386/machdep.c
@@ -1543,7 +1543,7 @@ getmemsize(int first)
 	/*
 	 * Certain 'CPU accelerator' supports over 16MB memory on the machines
 	 * whose BIOS doesn't store true size.  
-	 * To support this, we don't trust BIOS values if Maxmem < 16MB (0x1000
+	 * To support this, we don't trust BIOS values if Maxmem <= 16MB (0x1000
 	 * pages) - which is the largest amount that the OLD PC-98 can report.
 	 *
 	 * OK: PC-9801NS/R(9.6M)
@@ -1551,7 +1551,7 @@ getmemsize(int first)
 	 * OK: PC-9821Ap(14.6M)+EUA-T(8M)+Cyrix 5x86-100
 	 * NG: PC-9821Ap(14.6M)+EUA-T(8M)+AMD DX4-100 -> freeze
 	 */
-	if (Maxmem < 0x1000) {
+	if (Maxmem <= 0x1000) {
 		int tmp, page_bad;
 
 		page_bad = FALSE;
diff --git a/sys/pc98/pc98/machdep.c b/sys/pc98/pc98/machdep.c
index 591503b0722b..1918878b68e5 100644
--- a/sys/pc98/pc98/machdep.c
+++ b/sys/pc98/pc98/machdep.c
@@ -1543,7 +1543,7 @@ getmemsize(int first)
 	/*
 	 * Certain 'CPU accelerator' supports over 16MB memory on the machines
 	 * whose BIOS doesn't store true size.  
-	 * To support this, we don't trust BIOS values if Maxmem < 16MB (0x1000
+	 * To support this, we don't trust BIOS values if Maxmem <= 16MB (0x1000
 	 * pages) - which is the largest amount that the OLD PC-98 can report.
 	 *
 	 * OK: PC-9801NS/R(9.6M)
@@ -1551,7 +1551,7 @@ getmemsize(int first)
 	 * OK: PC-9821Ap(14.6M)+EUA-T(8M)+Cyrix 5x86-100
 	 * NG: PC-9821Ap(14.6M)+EUA-T(8M)+AMD DX4-100 -> freeze
 	 */
-	if (Maxmem < 0x1000) {
+	if (Maxmem <= 0x1000) {
 		int tmp, page_bad;
 
 		page_bad = FALSE;
diff --git a/sys/pc98/pc98/pc98_machdep.c b/sys/pc98/pc98/pc98_machdep.c
index e0571f75e09a..a2a0a79e9479 100644
--- a/sys/pc98/pc98/pc98_machdep.c
+++ b/sys/pc98/pc98/pc98_machdep.c
@@ -147,6 +147,7 @@ pc98_getmemsize(unsigned *base, unsigned *ext, unsigned *under16)
 	if (over16 > 0) {
 		*ext = (16 + over16) * 1024;
 	}
+	*ext -= 1024;	/* subtract base memory space */
 }
 
 /*