From dd49c6d79ba7633ee2cd551d54fbee2c17391f1a Mon Sep 17 00:00:00 2001
From: sparky4 <sparky4@cock.li>
Date: Thu, 26 Jan 2017 12:09:59 -0600
Subject: [PATCH] showing row and colum drawing i optimized it to only draw at
 the end of walk. this explains why it is much slower than it was before

---
 src/lib/16_tail.c | 38 ++++++++++++++++++++++++++++++++++++++
 src/lib/16_tail.h |  2 ++
 2 files changed, 40 insertions(+)

diff --git a/src/lib/16_tail.c b/src/lib/16_tail.c
index 6ebe442d..41379e32 100755
--- a/src/lib/16_tail.c
+++ b/src/lib/16_tail.c
@@ -388,6 +388,44 @@ void walktypeinfo(player_t *player, word pn)
 	}
 }
 
+void turboXT(byte bakapee)
+{
+	//byte bakapee = 12;
+	__asm {
+	push	ax
+	push	bx
+	push	cx
+	in	al, 61h 			; Read equipment flags
+	xor	al, bakapee			;   toggle speed
+	out	61h, al 			; Write new flags back
+
+	mov	bx, 0F89h			; low pitch blip
+	and	al, 4				; Is turbo mode set?
+	jz	@@do_beep
+	mov	bx, 52Eh			; high pitch blip
+
+@@do_beep:
+	mov	al, 10110110b		; Timer IC 8253 square waves
+	out	43h, al 			;   channel 2, speaker
+	mov	ax, bx
+	out	42h, al 			;   send low order
+	mov	al, ah				;   load high order
+	out	42h, al 			;   send high order
+	in	al, 61h 			; Read IC 8255 machine status
+	push	ax
+	or	al, 00000011b
+	out	61h, al 			; Turn speaker on
+	mov	cx, 2000h
+@@delay:
+	loop    @@delay
+	pop	ax
+	out	61h, al 			; Turn speaker off
+	pop	cx
+	pop	bx
+	pop	ax
+	}
+}
+
 const char *nibble_to_binary(nibble x)
 {
 	static char b[9];
diff --git a/src/lib/16_tail.h b/src/lib/16_tail.h
index 932d557f..8d7082a3 100755
--- a/src/lib/16_tail.h
+++ b/src/lib/16_tail.h
@@ -39,6 +39,7 @@
 	FUNCTIONKEYFUNCTIONS0EXE
 
 #define FUNCTIONKEYFUNCTIONS0EXE \
+	if(IN_KeyDown(sc_F4)){ turboXT(12);									IN_UserInput(1,1); } \
 	if(IN_KeyDown(87/*sc_F11*/)){ pageflipflop=!pageflipflop;					IN_UserInput(1,1); } \
 	if(IN_KeyDown(68/*sc_F10*/)){ gvar.kurokku.fpscap=!gvar.kurokku.fpscap;		IN_UserInput(1,1); } \
 	if(IN_KeyDown(sc_F9)){ pagenorendermap=!pagenorendermap;				IN_UserInput(1,1); } \
@@ -77,6 +78,7 @@ void Shutdown16(global_game_variables_t *gvar);
 void Startup16(global_game_variables_t *gvar);
 void ClearMemory (global_game_variables_t *gvar);
 void Quit (global_game_variables_t *gvar, char *error);
+void turboXT(byte bakapee);
 void walktypeinfo(player_t *player, word pn);
 void nibbletest();
 void booleantest();
-- 
2.39.5