H8: added support for H8T tapes.

This commit is contained in:
Robbbert 2020-04-06 01:37:05 +10:00
parent f07357d52b
commit b5e08ae5e8
5 changed files with 183 additions and 0 deletions

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@ -929,6 +929,18 @@ if (FORMATS["GUAB_DSK"]~=null or _OPTIONS["with-tools"]) then
}
end
--------------------------------------------------
--
--@src/lib/formats/h8_cas.h,FORMATS["H8_CAS"] = true
--------------------------------------------------
if (FORMATS["H8_CAS"]~=null or _OPTIONS["with-tools"]) then
files {
MAME_DIR.. "src/lib/formats/h8_cas.cpp",
MAME_DIR.. "src/lib/formats/h8_cas.h",
}
end
--------------------------------------------------
--
--@src/lib/formats/hector_minidisc.h,FORMATS["HECTOR_MINIDISC"] = true

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@ -988,6 +988,7 @@ FORMATS["FMTOWNS_DSK"] = true
FORMATS["FSD_DSK"] = true
FORMATS["G64_DSK"] = true
FORMATS["GTP_CAS"] = true
FORMATS["H8_CAS"] = true
FORMATS["HECTOR_MINIDISC"] = true
FORMATS["HECT_DSK"] = true
FORMATS["HECT_TAP"] = true

149
src/lib/formats/h8_cas.cpp Normal file
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@ -0,0 +1,149 @@
// license:BSD-3-Clause
// copyright-holders:Robbbert
/********************************************************************
Support for Heathkit H8 H8T cassette images
Standard Kansas City format (300 baud)
We output a leader, followed by the contents of the H8T file.
********************************************************************/
#include <cassert>
#include "h8_cas.h"
#define WAVEENTRY_LOW -32768
#define WAVEENTRY_HIGH 32767
#define H8_WAV_FREQUENCY 9600
// image size
static int h8_image_size;
static int h8_put_samples(int16_t *buffer, int sample_pos, int count, int level)
{
if (buffer)
{
for (int i=0; i<count; i++)
buffer[sample_pos + i] = level;
}
return count;
}
static int h8_output_bit(int16_t *buffer, int sample_pos, bool bit)
{
int samples = 0;
for (uint8_t i = 0; i < 4; i++)
{
if (bit)
{
samples += h8_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_LOW);
samples += h8_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_HIGH);
samples += h8_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_LOW);
samples += h8_put_samples(buffer, sample_pos + samples, 2, WAVEENTRY_HIGH);
}
else
{
samples += h8_put_samples(buffer, sample_pos + samples, 4, WAVEENTRY_LOW);
samples += h8_put_samples(buffer, sample_pos + samples, 4, WAVEENTRY_HIGH);
}
}
return samples;
}
static int h8_output_byte(int16_t *buffer, int sample_pos, uint8_t byte)
{
int samples = 0;
uint8_t i;
// start bit
samples += h8_output_bit (buffer, sample_pos + samples, 0);
// data bits
for (i = 0; i<8; i++)
samples += h8_output_bit (buffer, sample_pos + samples, (byte >> i) & 1);
// stop bits
for (i = 0; i<2; i++)
samples += h8_output_bit (buffer, sample_pos + samples, 1);
return samples;
}
static int h8_handle_cassette(int16_t *buffer, const uint8_t *bytes)
{
uint32_t sample_count = 0;
uint32_t byte_count = 0;
uint32_t i;
// leader
for (i=0; i<2000; i++)
sample_count += h8_output_bit(buffer, sample_count, 1);
// data
for (i=byte_count; i<h8_image_size; i++)
sample_count += h8_output_byte(buffer, sample_count, bytes[i]);
return sample_count;
}
/*******************************************************************
Generate samples for the tape image
********************************************************************/
static int h8_cassette_fill_wave(int16_t *buffer, int length, uint8_t *bytes)
{
return h8_handle_cassette(buffer, bytes);
}
/*******************************************************************
Calculate the number of samples needed for this tape image
********************************************************************/
static int h8_cassette_calculate_size_in_samples(const uint8_t *bytes, int length)
{
h8_image_size = length;
return h8_handle_cassette(nullptr, bytes);
}
static const struct CassetteLegacyWaveFiller h8_legacy_fill_wave =
{
h8_cassette_fill_wave, /* fill_wave */
-1, /* chunk_size */
0, /* chunk_samples */
h8_cassette_calculate_size_in_samples, /* chunk_sample_calc */
H8_WAV_FREQUENCY, /* sample_frequency */
0, /* header_samples */
0 /* trailer_samples */
};
static cassette_image::error h8_cassette_identify(cassette_image *cassette, struct CassetteOptions *opts)
{
return cassette_legacy_identify(cassette, opts, &h8_legacy_fill_wave);
}
static cassette_image::error h8_cassette_load(cassette_image *cassette)
{
return cassette_legacy_construct(cassette, &h8_legacy_fill_wave);
}
static const struct CassetteFormat h8_cassette_image_format =
{
"h8t",
h8_cassette_identify,
h8_cassette_load,
nullptr
};
CASSETTE_FORMATLIST_START(h8_cassette_formats)
CASSETTE_FORMAT(h8_cassette_image_format)
CASSETTE_FORMATLIST_END

19
src/lib/formats/h8_cas.h Normal file
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@ -0,0 +1,19 @@
// license:BSD-3-Clause
// copyright-holders:Robbbert
/*********************************************************************
h8_cas.h
Format code for Heathkit H8 H8T cassette images
*********************************************************************/
#ifndef MAME_FORMATS_H8_CAS_H
#define MAME_FORMATS_H8_CAS_H
#pragma once
#include "cassimg.h"
CASSETTE_FORMATLIST_EXTERN(h8_cassette_formats);
#endif // MAME_FORMATS_H8_CAS_H

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@ -54,6 +54,7 @@ Official test program from pages 4 to 8 of the operator's manual:
#include "sound/beep.h"
#include "speaker.h"
#include "formats/h8_cas.h"
#include "h8.lh"
@ -343,6 +344,7 @@ void h8_state::h8(machine_config &config)
cassette_clock.signal_handler().append(m_uart, FUNC(i8251_device::write_rxc));
CASSETTE(config, m_cass);
m_cass->set_formats(h8_cassette_formats);
m_cass->set_default_state(CASSETTE_STOPPED | CASSETTE_MOTOR_ENABLED | CASSETTE_SPEAKER_ENABLED);
m_cass->add_route(ALL_OUTPUTS, "mono", 0.05);
m_cass->set_interface("h8_cass");