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ay8910: changed my mind on prev i/o bandaid, it's too dangerous: port read callback implies read strobe, but it doesn't do that on port direction write (nw)

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This commit is contained in:
hap 2019-04-07 22:16:15 +02:00
parent 045eaae387
commit a60f8ba71d
3 changed files with 10 additions and 12 deletions
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6
src/devices/sound/ay8910.cpp
View File

@ -966,9 +966,6 @@ void ay8910_device::ay8910_write_reg(int r, int v)
if ((m_last_enable == -1) ||
((m_last_enable & 0x40) != (m_regs[AY_ENABLE] & 0x40)))
{
if (!m_port_a_read_cb.isnull())
m_regs[AY_PORTA] = m_port_a_read_cb(0);
/* write out 0xff if port set to input */
if (!m_port_a_write_cb.isnull())
m_port_a_write_cb((offs_t)0, (m_regs[AY_ENABLE] & 0x40) ? m_regs[AY_PORTA] : 0xff);
@ -977,9 +974,6 @@ void ay8910_device::ay8910_write_reg(int r, int v)
if ((m_last_enable == -1) ||
((m_last_enable & 0x80) != (m_regs[AY_ENABLE] & 0x80)))
{
if (!m_port_b_read_cb.isnull())
m_regs[AY_PORTB] = m_port_b_read_cb(0);
/* write out 0xff if port set to input */
if (!m_port_b_write_cb.isnull())
m_port_b_write_cb((offs_t)0, (m_regs[AY_ENABLE] & 0x80) ? m_regs[AY_PORTB] : 0xff);

9
src/mame/drivers/lockon.cpp
View File

@ -6,8 +6,10 @@
driver by Phil Bennett
Known bugs:
* None
TODO:
* Coincounters add one coin at boot, caused by ay8910 writing 00 on
port direction change. Likely wrong I/O emulation in ay8910 device,
but not trivial to fix.
***************************************************************************/
@ -28,7 +30,7 @@
/*************************************
*
* Forward definitions
* Holy Space for The 5 Wise Enters
*
*************************************/
@ -511,7 +513,6 @@ void lockon_state::lockon(machine_config &config)
ymsnd.irq_handler().set(FUNC(lockon_state::ym2203_irq));
ymsnd.port_a_read_callback().set_ioport("YM2203");
ymsnd.port_b_write_callback().set(FUNC(lockon_state::ym2203_out_b));
ymsnd.port_b_read_callback().set_constant(0xff);
ymsnd.add_route(0, "lspeaker", 0.40);
ymsnd.add_route(0, "rspeaker", 0.40);
ymsnd.add_route(1, "f2203.1l", 1.0);

7
src/mame/drivers/tispeak.cpp
View File

@ -419,13 +419,15 @@ K28 modules:
#include "snspellsp.lh"
#include "tntell.lh" // keyboard overlay
namespace {
// The master clock is a single stage RC oscillator into TMS5100 RCOSC:
// In an early 1979 Speak & Spell, C is 68pf, R is a 50kohm trimpot which is set to around 33.6kohm
// (measured in-circuit). CPUCLK is this osc freq /2, ROMCLK is this osc freq /4.
// The typical osc freq curve for TMS5100 is unknown. Let's assume it is set to the default frequency,
// which is 640kHz for 8KHz according to the TMS5100 documentation.
#define MASTER_CLOCK 640_kHz_XTAL
#define MASTER_CLOCK 640000
class tispeak_state : public hh_tms1k_state
@ -505,7 +507,6 @@ private:
u8 m_overlay;
};
void tispeak_state::machine_start()
{
hh_tms1k_state::machine_start();
@ -1879,6 +1880,8 @@ ROM_START( k28m2 )
ROM_LOAD( "cm62084.vsm", 0x0000, 0x4000, CRC(cd1376f7) SHA1(96fa484c392c451599bc083b8376cad9c998df7d) )
ROM_END
} // anonymous namespace
// YEAR NAME PARENT CMP MACHINE INPUT CLASS INIT COMPANY FULLNAME FLAGS