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hitachi/bmjr.cpp: preliminary DAC sound

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This commit is contained in:
angelosa 2024-09-17 20:19:18 +02:00
parent 5a700fc2c9
commit 31efb55ddf
1 changed files with 10 additions and 8 deletions
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18
src/mame/hitachi/bmjr.cpp
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@ -5,12 +5,11 @@
Basic Master Jr. (MB-6885) (c) 1982? Hitachi
TODO:
- Memory view control at $efd0;
- Convert MP-1710 color adapter to device (bmjr specific);
- Sound DAC;
- Identify and improve Sound DAC details;
- Keyboard eats inputs if typed relatively fast (verify, particularly with emu.keypost);
- Break key is unemulated (tied with the NMI);
- Downgrade for earlier variants (needs dump first);
- Downgrade for earlier variants (needs dump first), convert MP-1710 color adapter to device
(bmjr specific);
**************************************************************************************************/
@ -18,6 +17,7 @@ TODO:
#include "cpu/m6800/m6800.h"
#include "imagedev/cassette.h"
#include "machine/timer.h"
#include "sound/dac.h"
#include "emupal.h"
#include "screen.h"
@ -33,6 +33,7 @@ public:
: driver_device(mconfig, type, tag)
, m_maincpu(*this, "maincpu")
, m_cass(*this, "cassette")
, m_dac(*this, "dac")
, m_work_ram(*this, "work_ram")
, m_basic_view(*this, "basic_view")
, m_printer_view(*this, "printer_view")
@ -68,6 +69,7 @@ private:
virtual void machine_reset() override;
required_device<cpu_device> m_maincpu;
required_device<cassette_image_device> m_cass;
required_device<dac_5bit_binary_weighted_device> m_dac;
required_shared_ptr<u8> m_work_ram;
memory_view m_basic_view;
memory_view m_printer_view;
@ -185,8 +187,7 @@ void bmjr_state::tape_w(u8 data)
{
if(!m_tape_switch)
{
// TODO: to five bit DAC, --xx xxx-
//m_beep->set_state(!BIT(data, 7));
m_dac->write((data >> 1) & 0x1f);
}
else
{
@ -469,7 +470,8 @@ void bmjr_state::bmjr(machine_config &config)
GFXDECODE(config, "gfxdecode", "palette", gfx_bmjr);
SPEAKER(config, "mono").front_center();
// TODO: DAC_5BIT_?
// TODO: unknown DAC type, likely connected to discrete circuitry.
DAC_5BIT_BINARY_WEIGHTED(config, m_dac).add_route(ALL_OUTPUTS, "mono", 0.25);
}
/* ROM definition */
@ -493,4 +495,4 @@ ROM_END
// 1979 Basic Master MB-6880 (retroactively Level 1)
// 1979 Basic Master Level 2 MB-6880L2
// 1980 Basic Master Level 2 II MB-6881
COMP( 1981, bmjr, 0, 0, bmjr, bmjr, bmjr_state, empty_init, "Hitachi", "Basic Master Jr. (MB-6885)", MACHINE_NOT_WORKING | MACHINE_NO_SOUND | MACHINE_SUPPORTS_SAVE )
COMP( 1981, bmjr, 0, 0, bmjr, bmjr, bmjr_state, empty_init, "Hitachi", "Basic Master Jr. (MB-6885)", MACHINE_NOT_WORKING | MACHINE_IMPERFECT_SOUND | MACHINE_SUPPORTS_SAVE )