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sms: More documentation update [Enik]

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This commit is contained in:
Miodrag Milanovic 2016-05-25 10:52:52 +02:00
parent f7adead900
commit edd814b95f
4 changed files with 29 additions and 11 deletions
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2
src/devices/bus/sms_ctrl/paddle.cpp
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@ -35,7 +35,7 @@ const device_type SMS_PADDLE = &device_creator<sms_paddle_device>;
// time interval not verified
// Player 2 of Galactic Protector is the most sensible to this timming.
#define PADDLE_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/100)
#define PADDLE_INTERVAL attotime::from_hz(XTAL_10_738635MHz/3/100)
CUSTOM_INPUT_MEMBER( sms_paddle_device::rldu_pins_r )

8
src/devices/bus/sms_ctrl/sports.cpp
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@ -24,12 +24,6 @@ Notes:
uses a different mode, because the Sega Mark III lacks the TH line, so
there is a different Sports Pad model released in Japan (see sportsjp.c).
The Japanese SMS has the TH line connected, but doesn't report TH input
on port 0xDD. However, a magazine raffled the US Sports Pad along with a
Great Ice Hockey cartridge, in Japanese format, to owners of that console.
So, Great Ice Hockey seems to just need TH pin as output to work, while
other games designed for the US Sports Pad don't work on the Japanese SMS.
It was discovered that games designed for the Paddle Controller, released
in Japan, switch to a mode incompatible with the original Paddle when
detect the system region as Export. Similar to how the US model of the
@ -53,7 +47,7 @@ Notes:
const device_type SMS_SPORTS_PAD = &device_creator<sms_sports_pad_device>;
// time interval not verified
#define SPORTS_PAD_INTERVAL attotime::from_hz(XTAL_53_693175MHz/15/512)
#define SPORTS_PAD_INTERVAL attotime::from_hz(XTAL_10_738635MHz/3/512)
void sms_sports_pad_device::device_timer(emu_timer &timer, device_timer_id id, int param, void *ptr)

6
src/mame/drivers/sms.cpp
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@ -25,9 +25,9 @@
- SMS drivers for other versions (one has a 10.746168MHz XTAL)
- Software compatibility flags, by region and/or BIOS
- Samsung modem for Gam*Boy Securities Information Service System
- Sega Demo Unit II (kiosk expansion device)
- SMS 8 slot game changer (kiosk expansion device)
- SMS Disk System (floppy disk drive expansion device) - unreleased
- Sega Demo Unit II (SMS kiosk-like expansion device)
- SMS 8 slot game changer (kiosk-like expansion device)
- Sega Floppy Disc Unit (SMS expansion device) - unreleased
- Emulate SRAM cartridges? (for use with Bock's dump tool)
The Game Gear SIO hardware is not emulated but has some

24
src/mame/machine/sms.cpp
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@ -387,7 +387,25 @@ READ8_MEMBER(sms_state::sms_audio_control_r)
if (m_has_fm)
{
if (m_is_smsj)
{
/* Charles MacDonald discovered an internal 12-bit counter that is
incremented on each pulse of the C-Sync line that connects the VDP
with the 315-5297. Only 3 bits of the counter are returned when
read this port:
D7 : Counter bit 11
D6 : Counter bit 7
D5 : Counter bit 3
D4 : Always zero
D3 : Always zero
D2 : Always zero
D1 : Mute control bit 1
D0 : Mute control bit 0
For the moment, only the mute bits are handled by this code.
*/
return m_audio_control & 0x03;
}
else
return m_audio_control & 0x01;
}
@ -452,8 +470,14 @@ READ8_MEMBER(sms_state::gg_input_port_00_r)
return 0xff;
else
{
// bit 6 is NJAP (0=domestic/1=overseas); bit 7 is STT (START button)
UINT8 data = (m_is_gg_region_japan ? 0x00 : 0x40) | (m_port_start->read() & 0x80);
// According to GG official docs, bits 0-4 are meaningless and bit 5
// is NNTS (0=NTSC, 1=PAL). All games run in NTSC and no original GG
// allows the user to change that mode, but there are NTSC and PAL
// versions of the TV Tuner.
//logerror("port $00 read, val: %02x, pc: %04x\n", data, activecpu_get_pc());
return data;
}