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r15545 Friday 6th July, 2012 at 11:42:30 UTC by Curt Coder
[SC3000] Added support for the SC-3000 Survivors *.bit cassette file format. [Curt Coder, SC-3000 Survivor]

[src/lib]	lib.mak
[src/lib/formats]	sc3000_bit.c* sc3000_bit.h*
[src/mess/drivers]	sg1000.c
[src/mess/includes]	sg1000.h

src/lib/formats/sc3000_bit.c

r0	r15545
	1	/*********************************************************************
	2
	3	formats/sc3000_bit.c
	4
	5	Cassette code for Sega SC-3000 *.bit files
	6
	7	*********************************************************************/
	8
	9	#include "sc3000_bit.h"
	10
	11	/***************************************************************************
	12	PARAMETERS
	13	***************************************************************************/
	14
	15	#define LOG 0
	16
	17	/***************************************************************************
	18	IMPLEMENTATION
	19	***************************************************************************/
	20
	21	/*-------------------------------------------------
	22	CassetteModulation sc3000_bit_modulation
	23	-------------------------------------------------*/
	24
	25	static const struct CassetteModulation sc3000_bit_modulation =
	26	{
	27	CASSETTE_MODULATION_SINEWAVE,
	28	1200.0 - 300, 1200.0, 1200.0 + 300,
	29	2400.0 - 600, 2400.0, 2400.0 + 600
	30	};
	31
	32	/*-------------------------------------------------
	33	sc3000_bit_identify - identify cassette
	34	-------------------------------------------------*/
	35
	36	static casserr_t sc3000_bit_identify(cassette_image *cassette, struct CassetteOptions *opts)
	37	{
	38	return cassette_modulation_identify( cassette, &sc3000_bit_modulation, opts);
	39	}
	40
	41	/*-------------------------------------------------
	42	sc3000_bit_load - load cassette
	43	-------------------------------------------------*/
	44
	45	#define MODULATE(_value) \
	46	for (int i = 0; i < (_value ? 2 : 1); i++) { \
	47	err = cassette_put_modulated_data_bit(cassette, 0, time_index, _value, &sc3000_bit_modulation, &time_displacement);\
	48	if (err) return err;\
	49	time_index += time_displacement;\
	50	}
	51
	52	static casserr_t sc3000_bit_load(cassette_image *cassette)
	53	{
	54	casserr_t err;
	55	UINT64 image_size = cassette_image_size(cassette);
	56	UINT64 image_pos = 0;
	57	double time_index = 0.0;
	58	double time_displacement;
	59	UINT8 data;
	60
	61	while (image_pos < image_size)
	62	{
	63	cassette_image_read(cassette, &data, image_pos, 1);
	64
	65	switch (data)
	66	{
	67	case '1':
	68	MODULATE(1);
	69	break;
	70
	71	case '0':
	72	MODULATE(0);
	73	break;
	74
	75	case ' ':
	76	err = cassette_put_sample( cassette, 0, time_index, 1/1200.0, 0);
	77	if (err) return err;
	78	time_index += 1/1200.0;
	79	break;
	80	}
	81
	82	image_pos++;
	83	}
	84
	85	return CASSETTE_ERROR_SUCCESS;
	86	}
	87
	88	/*-------------------------------------------------
	89	CassetteFormat sc3000_bit_cassette_format
	90	-------------------------------------------------*/
	91
	92	const struct CassetteFormat sc3000_bit_format =
	93	{
	94	"bit",
	95	sc3000_bit_identify,
	96	sc3000_bit_load,
	97	NULL
	98	};
	99
	100	CASSETTE_FORMATLIST_START( sc3000_cassette_formats )
	101	CASSETTE_FORMAT(sc3000_bit_format)
	102	CASSETTE_FORMATLIST_END

src/lib/formats/sc3000_bit.h

r0	r15545
	1	/*********************************************************************
	2
	3	formats/sc3000_bit.h
	4
	5	Cassette code for Sega SC-3000 *.bit files
	6
	7	*********************************************************************/
	8
	9	#pragma once
	10
	11	#ifndef __SC3000_BIT__
	12	#define __SC3000_BIT__
	13
	14	#include "cassimg.h"
	15
	16	CASSETTE_FORMATLIST_EXTERN( sc3000_cassette_formats );
	17
	18	#endif

src/lib/lib.mak

r15544	r15545
144	144	$(LIBOBJ)/formats/pmd_cas.o      \
145	145	$(LIBOBJ)/formats/primoptp.o   \
146	146	$(LIBOBJ)/formats/rk_cas.o      \
	147	$(LIBOBJ)/formats/sc3000_bit.o   \
147	148	$(LIBOBJ)/formats/smx_dsk.o      \
148	149	$(LIBOBJ)/formats/sorc_dsk.o   \
149	150	$(LIBOBJ)/formats/sord_cas.o   \

src/mess/includes/sg1000.h

r15544	r15545
9	9	#include "machine/ram.h"
10	10	#include "imagedev/printer.h"
11	11	#include "formats/basicdsk.h"
	12	#include "formats/sc3000_bit.h"
12	13	#include "machine/ctronics.h"
13	14	#include "machine/i8255.h"
14	15	#include "machine/i8251.h"

src/mess/drivers/sg1000.c

r15544	r15545
625	625
626	626	const cassette_interface sc3000_cassette_interface =
627	627	{
628		cassette_default_formats,
	628	sc3000_cassette_formats,
629	629	NULL,
630	630	(cassette_state)(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED),
631	631	NULL,

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