Merge pull request #64 from jbrandwood/master

Add cd_fastvram() function to the HuCC library to fix HuC's slow CD loading to VRAM.

include/hucc/hucc-systemcard.asm

@@ -277,6 +277,34 @@ _cd_playmsf.7	.proc
 
 
 
+; ***************************************************************************
+; ***************************************************************************
+;
+; unsigned char __fastcall cd_loadvram( unsigned char ovl_index<_cl>, unsigned int sect_offset<_si>, unsigned int vramaddr<_bx>, unsigned int sectors<_al> );
+
+_cd_fastvram.4	.proc
+
+		ldx	<_cl			; Get file address and length.
+		jsr	get_file_lba
+
+		lda.l	<_si			; Add the sector offset.
+		ldy.h	<_si
+		jsr	_add_sectors
+
+		lda	#$FF			; Signal a VRAM load.
+		sta	<_dh
+
+		system	cd_read
+		tax				; Put return code in X.
+
+		cly				; Return code in Y:X, X -> A.
+
+		leave				; Return and copy X -> A.
+
+		.endp
+
+
+
 ; ***************************************************************************
 ; ***************************************************************************
 ;

include/hucc/hucc-systemcard.h

@@ -92,6 +92,7 @@ extern unsigned char __fastcall cd_unpause( void );
 extern void __fastcall __macro cd_fade( unsigned char type<acc> );
 extern unsigned char __fastcall cd_playtrk( unsigned char start_track<_bx>, unsigned char end_track<_cx>, unsigned char mode<_dh> );
 extern unsigned char __fastcall cd_playmsf( unsigned char start_minute<_al>,  unsigned char start_second<_ah>,  unsigned char start_frame<_bl>, unsigned char end_minute<_cl>,  unsigned char end_second<_ch>,  unsigned char end_frame<_dl>,  unsigned char mode<_dh> );
+extern unsigned char __fastcall cd_fastvram( unsigned char ovl_index<_cl>, unsigned int sect_offset<_si>, unsigned int vramaddr<_bx>, unsigned int sectors<_al> );
 extern unsigned char __fastcall cd_loadvram( unsigned char ovl_index<_cl>, unsigned int sect_offset<_si>, unsigned int vramaddr<_bx>, unsigned int bytes<_ax> );
 extern unsigned char __fastcall cd_loaddata( unsigned char ovl_index<_cl>, unsigned int sect_offset<_si>, unsigned char __far *buffer<_bp_bank:_bp>, unsigned int bytes<__ptr> );
 extern unsigned char __fastcall cd_loadbank( unsigned char ovl_index<_cl>, unsigned int sect_offset<_si>, unsigned char bank<_bl>, unsigned int sectors<_al> );