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[Core/IO] increased Sega Mouse latency (fixes mouse support in Star Blade)

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EkeEke 2017-07-15 13:00:49 +02:00
parent 07f333b1ed
commit 63b0d6a4c1
3 changed files with 21 additions and 20 deletions
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1
HISTORY.txt
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@ -94,6 +94,7 @@ Genesis Plus GX 1.7.5 (xx/xx/xxxx) (Eke-Eke)
* improved HVC latch behavior for gun emulation (fixes "Gunfight - 3 in 1" randomization when using Justifier) * improved HVC latch behavior for gun emulation (fixes "Gunfight - 3 in 1" randomization when using Justifier)
* improved control pad emulation accuracy (verified on real hardware) * improved control pad emulation accuracy (verified on real hardware)
* improved 4 Way-Play emulation (fixes multitap detection in CD games) * improved 4 Way-Play emulation (fixes multitap detection in CD games)
* increased Sega Mouse latency (fixes mouse support in Star Blade)
* fixed TeamPlayer emulation (fixes multitap detection in Gauntlet 4) * fixed TeamPlayer emulation (fixes multitap detection in Gauntlet 4)
[Core/VDP] [Core/VDP]

36
core/input_hw/mouse.c
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@ -1,8 +1,8 @@
/*************************************************************************************** /***************************************************************************************
* Genesis Plus * Genesis Plus
* Sega Mouse support * Sega/Mega Mouse support
* *
* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met:
@ -113,15 +113,15 @@ unsigned char mouse_read()
/* TL = busy status */ /* TL = busy status */
if (mouse.Wait) if (mouse.Wait)
{ {
/* wait before ACK, fix some buggy mouse routine (Cannon Fodder, Shangai 2, Wack World,...) */ /* wait before acknowledging handshake request */
mouse.Wait = 0; mouse.Wait--;
/* TL = !TR */ /* TL = !TR (handshake in progress) */
temp |= (~mouse.State & 0x20) >> 1; temp |= (~mouse.State & 0x20) >> 1;;
} }
else else
{ {
/* TL = TR (data is ready) */ /* TL = TR (handshake completed) */
temp |= (mouse.State & 0x20) >> 1; temp |= (mouse.State & 0x20) >> 1;
} }
@ -133,25 +133,25 @@ void mouse_write(unsigned char data, unsigned char mask)
/* update bits set as output only */ /* update bits set as output only */
data = (mouse.State & ~mask) | (data & mask); data = (mouse.State & ~mask) | (data & mask);
/* TH transition */
if ((mouse.State ^ data) & 0x40)
{
/* start (TH=0) or stop (TH=1) acquisition */
mouse.Counter = 1 - ((data & 0x40) >> 6);
}
/* TR transition */ /* TR transition */
if ((mouse.State ^ data) & 0x20) if ((mouse.State ^ data) & 0x20)
{ {
/* acquisition in progress */ /* check if acquisition is started */
if ((mouse.Counter > 0) && (mouse.Counter < 10)) if ((mouse.Counter > 0) && (mouse.Counter < 9))
{ {
/* increment phase */ /* increment phase */
mouse.Counter++; mouse.Counter++;
} }
/* TL handshake latency */ /* TL handshake latency (fix buggy mouse routine in Cannon Fodder, Shangai 2, Wacky World, Star Blade, ...) */
mouse.Wait = 1; mouse.Wait = 2;
}
/* TH transition */
if ((mouse.State ^ data) & 0x40)
{
/* start (TH=1->0) or stop (TH=0->1) data acquisition */
mouse.Counter = (mouse.State >> 6) & 1;
} }
/* update internal state */ /* update internal state */

4
core/input_hw/mouse.h
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@ -1,8 +1,8 @@
/*************************************************************************************** /***************************************************************************************
* Genesis Plus * Genesis Plus
* Sega Mouse support * Sega/Mega Mouse support
* *
* Copyright (C) 2007-2011 Eke-Eke (Genesis Plus GX) * Copyright (C) 2007-2017 Eke-Eke (Genesis Plus GX)
* *
* Redistribution and use of this code or any derivative works are permitted * Redistribution and use of this code or any derivative works are permitted
* provided that the following conditions are met: * provided that the following conditions are met: