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improved Sega Mouse emulation (fixes Cannon Fodder mouse support)

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This commit is contained in:
ekeeke31 2011-05-01 11:43:33 +00:00
parent 57c5d89380
commit 4a39669a8d
1 changed files with 13 additions and 23 deletions
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36
source/input_hw/mouse.c
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@ -97,7 +97,7 @@ unsigned char mouse_read()
/* TL = busy status */
if (mouse.Wait)
{
/* wait before ACK, fix some buggy mouse routine (Shangai 2, Wack World,...) */
/* wait before ACK, fix some buggy mouse routine (Cannon Fodder, Shangai 2, Wack World,...) */
mouse.Wait = 0;
/* TL = !TR */
@ -117,35 +117,25 @@ void mouse_write(unsigned char data, unsigned char mask)
/* update bits set as output only */
data = (mouse.State & ~mask) | (data & mask);
if (mouse.Counter == 0)
/* TH transition */
if ((mouse.State ^ data) & 0x40)
{
/* wait for TH 1->0 transition */
if ((mouse.State & 0x40) && !(data & 0x40))
{
/* start acquisition */
mouse.Counter = 1;
}
/* start (TH=0) or stop (TH=1) acquisition */
mouse.Counter = 1 - ((data & 0x40) >> 6);
}
else
/* TR transition */
if ((mouse.State ^ data) & 0x20)
{
/* TR handshake */
if ((mouse.State ^ data) & 0x20)
/* acquisition in progress */
if ((mouse.Counter > 0) && (mouse.Counter < 10))
{
/* increment phase */
if (mouse.Counter < 10)
{
mouse.Counter++;
}
/* input latency */
mouse.Wait = 1;
mouse.Counter++;
}
}
/* end of acquisition (TH=1) */
if (data & 0x40)
{
mouse.Counter = 0;
/* TL handshake latency */
mouse.Wait = 1;
}
/* update internal state */