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osborne1: better beeper handling (will improve software trying to play 1-bit audio)

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This commit is contained in:
Vas Crabb 2015-11-01 04:41:05 +11:00
parent 7a85ac5adc
commit 7732ef8524
2 changed files with 10 additions and 3 deletions
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5
src/mame/drivers/osborne1.c
View File

@ -54,6 +54,10 @@ the correct rates). MAME's bitbanger seems to be able to accept the ACIA
output at this rate, but the ACIA screws up when consuming data from MAME's
bitbanger.
Schematics specify a WD1793 floppy controller, but we're using the Fujitsu
equivalent MB8877 here. Is it known that the original machines used one or
the other exclusively? In any case MAME emulates them identically.
***************************************************************************/
#include "includes/osborne1.h"
@ -178,6 +182,7 @@ static INPUT_PORTS_START( osborne1 )
PORT_BIT(0x01, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_START("CNF")
PORT_BIT(0xF8, IP_ACTIVE_LOW, IPT_UNUSED)
PORT_CONFNAME(0x06, 0x00, "Serial Speed")
PORT_CONFSETTING(0x00, "300/1200")
PORT_CONFSETTING(0x02, "600/2400")

8
src/mame/machine/osborne1.c
View File

@ -212,7 +212,7 @@ WRITE8_MEMBER( osborne1_state::video_pia_port_a_w )
WRITE8_MEMBER( osborne1_state::video_pia_port_b_w )
{
m_beep_state = BIT(data, 5);
m_speaker->level_w((BIT(data, 5) && m_beep_state) ? 1 : 0);
if (BIT(data, 6))
{
@ -367,11 +367,12 @@ TIMER_CALLBACK_MEMBER(osborne1_state::video_callback)
{
int const y = machine().first_screen()->vpos();
UINT8 const ra = y % 10;
UINT8 const port_b = m_pia1->b_output();
// Check for start/end of visible area and clear/set CA1 on video PIA
if (y == 0)
{
m_scroll_y = m_pia1->b_output() & 0x1F;
m_scroll_y = port_b & 0x1F;
m_pia1->ca1_w(0);
}
else if (y == 240)
@ -434,7 +435,8 @@ TIMER_CALLBACK_MEMBER(osborne1_state::video_callback)
}
// The beeper is gated so it's active four out of every ten scanlines
m_speaker->level_w((m_beep_state && (ra & 0x04)) ? 1 : 0);
m_beep_state = (ra & 0x04) ? 1 : 0;
m_speaker->level_w((BIT(port_b, 5) && m_beep_state) ? 1 : 0);
// Check reset key if necessary - it affects NMI
if (!m_ub6a_q)