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/* spectrum.h: Spectrum 48K specific routines
Copyright (c) 1999-2011 Philip Kendall, Darren Salt
$Id: spectrum.h 4638 2012-01-21 12:52:14Z fredm $
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License along
with this program; if not, write to the Free Software Foundation, Inc.,
51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
Author contact information:
E-mail: philip-fuse@shadowmagic.org.uk
*/
#ifndef FUSE_SPECTRUM_H
#define FUSE_SPECTRUM_H
#include <stdlib.h>
#include <libspectrum.h>
#include "memory.h"
/* How many tstates have elapsed since the last interrupt? (or more
precisely, since the ULA last pulled the /INT line to the Z80 low) */
extern libspectrum_dword tstates;
/* Things relating to memory */
extern libspectrum_byte RAM[ SPECTRUM_RAM_PAGES ][0x4000];
typedef int
(*spectrum_port_from_ula_function)( libspectrum_word port );
typedef libspectrum_byte
(*spectrum_contention_delay_function)( libspectrum_dword time );
typedef struct spectrum_raminfo {
/* Is this port result supplied by the ULA? */
spectrum_port_from_ula_function port_from_ula;
/* What's the actual delay at the current tstate with MREQ active */
spectrum_contention_delay_function contend_delay;
/* And without MREQ */
spectrum_contention_delay_function contend_delay_no_mreq;
int locked; /* Is the memory configuration locked? */
int current_page, current_rom; /* Current paged memory */
libspectrum_byte last_byte; /* The last byte sent to the 128K port */
libspectrum_byte last_byte2; /* The last byte sent to +3 port */
int special; /* Is a +3 special config in use? */
int romcs; /* Is the /ROMCS line low? */
int valid_pages; /* Available RAM */
} spectrum_raminfo;
libspectrum_byte spectrum_contend_delay_none( libspectrum_dword time );
libspectrum_byte spectrum_contend_delay_65432100( libspectrum_dword time );
libspectrum_byte spectrum_contend_delay_76543210( libspectrum_dword time );
libspectrum_byte spectrum_unattached_port( void );
libspectrum_byte spectrum_unattached_port_none( void );
/* Miscellaneous stuff */
extern int spectrum_frame_event;
void spectrum_init( void );
int spectrum_frame( void );
#endif /* #ifndef FUSE_SPECTRUM_H */
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