diff --git a/Agon-HW.md b/Agon-HW.md
index aa38f47..6a61f6b 100644
--- a/Agon-HW.md
+++ b/Agon-HW.md
@@ -368,7 +368,7 @@ Data packet sent from VDP (4 bytes):
 
 ```
 ; Keyboard Data
-; Received after a keypress event in the VPD
+; Received after a keypress event in the VDP
 ;
 vdp_protocol_KEY:
             LD        A, (_vdp_protocol_data + 0)    ; ASCII key code
diff --git a/src/agon/vdp_vdu.c b/src/agon/vdp_vdu.c
index bca0b78..cf00497 100644
--- a/src/agon/vdp_vdu.c
+++ b/src/agon/vdp_vdu.c
@@ -155,12 +155,12 @@ void vdp_get_scr_dims( bool wait )
 {
 	if ( !sys_vars ) vdp_vdu_init();
 
-	if ( wait ) sys_vars->vpd_pflags = 0;
+	if ( wait ) sys_vars->vdp_pflags = 0;
 
 	VDP_PUTS( vdu_get_scr_dims );
 
 	// wait for results of mode change to be reflected in SYSVARs
-	if ( wait ) while ( !(sys_vars->vpd_pflags & vdp_pflag_mode) );
+	if ( wait ) while ( !(sys_vars->vdp_pflags & vdp_pflag_mode) );
 }
 
 void vdp_logical_scr_dims( bool flag )
diff --git a/src/libc/include/mos_api.h b/src/libc/include/mos_api.h
index e20246b..160981b 100644
--- a/src/libc/include/mos_api.h
+++ b/src/libc/include/mos_api.h
@@ -102,7 +102,7 @@ typedef enum {
 #define sysvar_mouseXDelta		0x2F	// 2: Mouse X delta
 #define sysvar_mouseYDelta		0x31	// 2: Mouse Y delta
 
-// Flags for the VPD protocol - sysvar_vpd_pflags
+// Flags for the VDP protocol - sysvar_vdp_pflags
 #define vdp_pflag_cursor        0x01
 #define vdp_pflag_scrchar       0x02
 #define vdp_pflag_point         0x04
@@ -131,7 +131,7 @@ typedef union {
 
 typedef struct {
     uint32_t time;
-    uint8_t vpd_pflags;
+    uint8_t vdp_pflags;
     uint8_t keyascii;
     uint8_t keymods;
     uint8_t cursorX;
@@ -237,7 +237,7 @@ extern void  mos_puts(char * buffer, uint24_t size, char delimiter);
 
 // Get system variables
 extern uint32_t getsysvar_time();
-extern uint8_t  getsysvar_vpd_pflags();
+extern uint8_t  getsysvar_vdp_pflags();
 extern uint8_t  getsysvar_keyascii();
 extern uint8_t  getsysvar_keymods();
 extern uint8_t  getsysvar_cursorX();
diff --git a/src/libc/mos_api.inc b/src/libc/mos_api.inc
index 0191bb1..f164681 100644
--- a/src/libc/mos_api.inc
+++ b/src/libc/mos_api.inc
@@ -8,7 +8,7 @@
 ; Modinfo:
 ; 05/08/2022:	Added mos_feof
 ; 09/08/2022:	Added system variables: cursorX, cursorY
-; 18/08/2022:	Added system variables: scrchar, scrpixel, audioChannel, audioSuccess, vpd_pflags
+; 18/08/2022:	Added system variables: scrchar, scrpixel, audioChannel, audioSuccess, vdp_pflags
 ; 05/09/2022:	Added mos_ren, vdp_pflag_mode
 ; 24/09/2022:	Added mos_getError, mos_mkdir
 ; 13/10/2022:	Added mos_oscli
@@ -139,7 +139,7 @@ fa_open_append		:=	030h
 ; Index into _sysvars in globals.asm
 ;
 sysvar_time		:=	000h	; 4: Clock timer in centiseconds (incremented by 2 every VBLANK)
-sysvar_vpd_pflags	:=	004h	; 1: Flags to indicate completion of VDP commands
+sysvar_vdp_pflags	:=	004h	; 1: Flags to indicate completion of VDP commands
 sysvar_keyascii		:=	005h	; 1: ASCII keycode, or 0 if no key is pressed
 sysvar_keymods		:=	006h	; 1: Keycode modifiers
 sysvar_cursorX		:=	007h	; 1: Cursor X position
@@ -162,7 +162,7 @@ sysvar_keydelay		:=	022h	; 2: Keyboard repeat delay
 sysvar_keyrate		:=	024h	; 2: Keyboard repeat reat
 sysvar_keyled		:=	026h	; 1: Keyboard LED status
 	
-; Flags for the VPD protocol
+; Flags for the VDP protocol
 ;
 vdp_pflag_cursor	:=	00000001b
 vdp_pflag_scrchar	:=	00000010b
diff --git a/src/libc/mos_api.src b/src/libc/mos_api.src
index b04831b..d88b1c0 100644
--- a/src/libc/mos_api.src
+++ b/src/libc/mos_api.src
@@ -73,7 +73,7 @@
 	public  _mos_i2c_open
 
 	public	_getsysvar_time
-	public  _getsysvar_vpd_pflags
+	public  _getsysvar_vdp_pflags
 	public  _getsysvar_keyascii
 	public  _getsysvar_keymods
 	public  _getsysvar_cursorX
@@ -149,11 +149,11 @@ _getsysvar_time:
 	pop	ix
 	ret
 
-_getsysvar_vpd_pflags:
+_getsysvar_vdp_pflags:
 	push	ix
 	ld	a, mos_sysvars
 	rst.lil	08h
-	ld	a, (ix+sysvar_vpd_pflags)
+	ld	a, (ix+sysvar_vdp_pflags)
 	pop	ix
 	ret
 
diff --git a/tests/big-bitmap/src/vdp_vdu.c b/tests/big-bitmap/src/vdp_vdu.c
index 66709b5..9a1baf9 100644
--- a/tests/big-bitmap/src/vdp_vdu.c
+++ b/tests/big-bitmap/src/vdp_vdu.c
@@ -32,12 +32,12 @@ void vdp_get_scr_dims( bool wait )
 {
 	if ( !sv ) vdp_vdu_init();
 
-	if ( wait ) sv->vpd_pflags = 0;
+	if ( wait ) sv->vdp_pflags = 0;
 
 	mos_puts( (char *)&_vdp_get_scr_dims, sizeof(_vdp_get_scr_dims), 0 );
 
 	// wait for results of mode change to be reflected in SYSVARs
-	if ( wait ) while ( !(sv->vpd_pflags & vdp_pflag_mode) );
+	if ( wait ) while ( !(sv->vdp_pflags & vdp_pflag_mode) );
 }
 
 static struct { uint8_t vdu_23; uint8_t vdu_23_0; uint8_t vdu_23_0_0xC0; uint8_t flag; }
diff --git a/tests/vdu/src/vdp_vdu.c b/tests/vdu/src/vdp_vdu.c
index 66709b5..9a1baf9 100644
--- a/tests/vdu/src/vdp_vdu.c
+++ b/tests/vdu/src/vdp_vdu.c
@@ -32,12 +32,12 @@ void vdp_get_scr_dims( bool wait )
 {
 	if ( !sv ) vdp_vdu_init();
 
-	if ( wait ) sv->vpd_pflags = 0;
+	if ( wait ) sv->vdp_pflags = 0;
 
 	mos_puts( (char *)&_vdp_get_scr_dims, sizeof(_vdp_get_scr_dims), 0 );
 
 	// wait for results of mode change to be reflected in SYSVARs
-	if ( wait ) while ( !(sv->vpd_pflags & vdp_pflag_mode) );
+	if ( wait ) while ( !(sv->vdp_pflags & vdp_pflag_mode) );
 }
 
 static struct { uint8_t vdu_23; uint8_t vdu_23_0; uint8_t vdu_23_0_0xC0; uint8_t flag; }