diff --git a/src/equs.inc b/src/equs.inc
index 1d69026..82265c6 100644
--- a/src/equs.inc
+++ b/src/equs.inc
@@ -23,6 +23,8 @@ VDPP_FLAG_POINT:	EQU		00000100b
 VDPP_FLAG_AUDIO:	EQU		00001000b	
 VDPP_FLAG_MODE:		EQU		00010000b
 VDPP_FLAG_RTC:		EQU		00100000b
+VDPP_FLAG_MOUSE:	EQU		01000000b
+; VDPP_FLAG_BUFFERED:	EQU		10000000b
 
 ; For GPIO
 ; PA not available on eZ80F92
diff --git a/src/mos_api.inc b/src/mos_api.inc
index ac5bc52..f30e67a 100644
--- a/src/mos_api.inc
+++ b/src/mos_api.inc
@@ -153,7 +153,7 @@ sysvar_scrRows:		EQU	14h	; 1: Screen rows in characters
 sysvar_scrColours:	EQU	15h	; 1: Number of colours displayed
 sysvar_scrpixelIndex:	EQU	16h	; 1: Index of pixel data read from screen
 sysvar_vkeycode:	EQU	17h	; 1: Virtual key code from FabGL
-sysvar_vkeydown		EQU	18h	; 1: Virtual key state from FabGL (0=up, 1=down)
+sysvar_vkeydown:	EQU	18h	; 1: Virtual key state from FabGL (0=up, 1=down)
 sysvar_vkeycount:	EQU	19h	; 1: Incremented every time a key packet is received
 sysvar_rtc:		EQU	1Ah	; 6: Real time clock data
 sysvar_spare:		EQU	20h	; 2: Spare, previously used by rtc
@@ -162,6 +162,12 @@ sysvar_keyrate:		EQU	24h	; 2: Keyboard repeat reat
 sysvar_keyled:		EQU	26h	; 1: Keyboard LED status
 sysvar_scrMode:		EQU	27h	; 1: Screen mode
 sysvar_rtcEnable:	EQU	28h	; 1: RTC enable flag (0: disabled, 1: use ESP32 RTC)
+sysvar_mouseX:		EQU	29h	; 2: Mouse X position
+sysvar_mouseY:		EQU	2Bh	; 2: Mouse Y position
+sysvar_mouseButtons:	EQU	2Dh	; 1: Mouse button state
+sysvar_mouseWheel:	EQU	2Eh	; 1: Mouse wheel delta
+sysvar_mouseXDelta:	EQU	2Fh	; 2: Mouse X delta
+sysvar_mouseYDelta:	EQU	31h	; 2: Mouse Y delta
 	
 ; Flags for the VPD protocol
 ;
@@ -171,6 +177,8 @@ vdp_pflag_point:	EQU	00000100b
 vdp_pflag_audio:	EQU	00001000b
 vdp_pflag_mode:		EQU	00010000b
 vdp_pflag_rtc:		EQU	00100000b
+vdp_pflag_mouse:	EQU	01000000b
+; vdp_pflag_buffered:	EQU	10000000b
 
 ;
 ; FatFS structures
diff --git a/src/vdp_protocol.asm b/src/vdp_protocol.asm
index 4da89bb..0f13876 100644
--- a/src/vdp_protocol.asm
+++ b/src/vdp_protocol.asm
@@ -52,6 +52,7 @@
 			XREF	_keydelay 
 			XREF	_keyrate 
 			XREF 	_keyled
+			XREF	_mouseX
 			XREF	_gp
 			XREF	_vpd_protocol_flags
 			XREF	_vdp_protocol_state
@@ -142,7 +143,8 @@ vdp_protocol_vector:	JP	vdp_protocol_GP
 			JP	vdp_protocol_AUDIO
 			JP	vdp_protocol_MODE
 			JP	vdp_protocol_RTC
-			JP	vdp_protocol_KEYSTATE 
+			JP	vdp_protocol_KEYSTATE
+			JP	vdp_protocol_MOUSE
 ;
 vdp_protocol_vesize:	EQU	($-vdp_protocol_vector)/4
 	
@@ -309,4 +311,23 @@ vdp_protocol_KEYSTATE:	LD	HL, _vdp_protocol_data
 			LD	DE, _keydelay
 			LD	BC, 5
 			LDIR 
-			RET 
\ No newline at end of file
+			RET
+
+; Mouse data
+; Received after a mouse movement event, if mouse has been activated
+;
+; Word: X position
+; Word: Y position
+; Byte: Button state
+; Byte: Wheel delta
+; Word: X delta
+; Word: Y delta
+;
+vdp_protocol_MOUSE:	LD	HL, _vdp_protocol_data
+			LD	DE, _mouseX
+			LD	BC, 10
+			LDIR 
+			LD	A, (_vpd_protocol_flags)
+			OR	VDPP_FLAG_MOUSE
+			LD	(_vpd_protocol_flags), A
+			RET
diff --git a/src_startup/globals.asm b/src_startup/globals.asm
index ae14a9b..91b3140 100644
--- a/src_startup/globals.asm
+++ b/src_startup/globals.asm
@@ -43,12 +43,18 @@
 			XDEF	_scrrows
 			XDEF	_scrcolours
 			XDEF	_scrpixelIndex
-			XDEF	_rtc 
+			XDEF	_rtc
 			XDEF	_keydelay 
 			XDEF	_keyrate 
 			XDEF 	_keyled
 			XDEF	_scrmode
 			XDEF	_rtc_enable
+			XDEF	_mouseX
+			XDEF	_mouseY
+			XDEF	_mouseButtons
+			XDEF	_mouseWheel
+			XDEF	_mouseXDelta
+			XDEF	_mouseYDelta
 
 			XDEF	_errno
 			XDEF 	_coldBoot
@@ -97,6 +103,12 @@ _keyrate:		DS	2		; + 24h: Keyboard repeat rate
 _keyled:		DS	1		; + 26h: Keyboard LED status
 _scrmode:		DS	1		; + 27h: Screen mode
 _rtc_enable:		DS	1		; + 28h: RTC enable status
+_mouseX:		DS	2		; + 29h: Mouse X position
+_mouseY:		DS	2		; + 2Bh: Mouse Y position
+_mouseButtons:		DS	1		; + 2Dh: Mouse left+right+middle buttons (bits 0-2, 0=up, 1=down)
+_mouseWheel:		DS	1		; + 2Eh: Mouse wheel delta
+_mouseXDelta:		DS	2		; + 2Fh: Mouse X delta
+_mouseYDelta:		DS	2		; + 31h: Mouse Y delta
 
 _errno:			DS 	3		; extern int _errno
 _coldBoot:		DS	1		; extern char _coldBoot
@@ -125,8 +137,8 @@ _keymap:		DS	16		; A bitmap of pressed keys
 ; Bit 2: Pixel point packet received
 ; Bit 3: Audio packet received
 ; Bit 4: Mode packet received
-; Bit 5: Unused
-; Bit 6: Unused
+; Bit 5: RTC packet received
+; Bit 6: Mouse packet received
 ; Bit 7: Unused
 ;
 ; VDP protocol variables