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Fixed pit8253 hook-up, according to another document ...

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This commit is contained in:
Angelo Salese 2012-11-15 01:47:06 +00:00
parent 7df4c13f44
commit 183aac12da
1 changed files with 19 additions and 48 deletions
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67
src/mess/drivers/apc.c
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@ -15,8 +15,7 @@
i/o memory map:
0x00 - 0x1f DMA
0x20 - 0x23 i8259 master
0x28 - 0x2b i8259 slave
0x2b / 0x2f / 0x61 / 0x6f pit8253 (!)
0x28 - 0x2f i8259 slave (even), pit8253 (odd)
0x30 - 0x37 serial i8251, even #1 / odd #2
0x38 - 0x3f DMA segments
0x40 - 0x43 upd7220, even chr / odd bitmap
@ -25,6 +24,7 @@
0x58 rtc
0x5a - 0x5e APU
0x60 MPU (melody)
0x61 - 0x67 (Mirror of pit8253?)
0x68 - 0x6f parallel port
***************************************************************************/
@ -68,7 +68,6 @@ public:
DECLARE_READ8_MEMBER(apc_port_28_r);
DECLARE_WRITE8_MEMBER(apc_port_28_w);
DECLARE_WRITE8_MEMBER(apc_port_2e_w);
DECLARE_READ8_MEMBER(apc_port_60_r);
DECLARE_WRITE8_MEMBER(apc_port_60_w);
DECLARE_READ8_MEMBER(apc_gdc_r);
@ -135,18 +134,16 @@ READ8_MEMBER(apc_state::apc_port_28_r)
UINT8 res;
if(offset & 1)
{
if(offset == 3)
res = pit8253_r(machine().device("pit8253"), space, 0);
else
{
printf("Read undefined port 0x29\n");
res = 0xff;
}
}
res = pit8253_r(machine().device("pit8253"), space, (offset & 6) >> 1);
else
{
res = pic8259_r(machine().device("pic8259_slave"), space, (offset & 2) >> 1);
if(offset & 4)
{
printf("Read undefined port %02x\n",offset+0x28);
res = 0xff;
}
else
res = pic8259_r(machine().device("pic8259_slave"), space, (offset & 2) >> 1);
}
return res;
@ -155,25 +152,16 @@ READ8_MEMBER(apc_state::apc_port_28_r)
WRITE8_MEMBER(apc_state::apc_port_28_w)
{
if(offset & 1)
{
if(offset == 3)
pit8253_w(machine().device("pit8253"), space, 0, data);
else
{
printf("Write undefined port 0x29\n");
}
}
pit8253_w(machine().device("pit8253"), space, (offset & 6) >> 1, data);
else
{
pic8259_w(machine().device("pic8259_slave"), space, (offset & 2) >> 1, data);
if(offset & 4)
printf("Write undefined port %02x\n",offset+0x28);
else
pic8259_w(machine().device("pic8259_slave"), space, (offset & 2) >> 1, data);
}
}
WRITE8_MEMBER(apc_state::apc_port_2e_w)
{
pit8253_w(machine().device("pit8253"), space, 1, data);
}
READ8_MEMBER(apc_state::apc_port_60_r)
{
@ -181,13 +169,8 @@ READ8_MEMBER(apc_state::apc_port_60_r)
if(offset & 1)
{
if(offset == 1)
res = pit8253_r(machine().device("pit8253"), space, 2);
else
{
printf("Read undefined port %02x\n",offset+0x60);
res = 0xff;
}
printf("Read undefined port %02x\n",offset+0x60);
res = 0xff;
}
else
{
@ -202,14 +185,7 @@ WRITE8_MEMBER(apc_state::apc_port_60_w)
{
if(offset & 1)
{
if(offset == 1)
pit8253_w(machine().device("pit8253"), space, 2, data);
else if(offset == 7)
pit8253_w(machine().device("pit8253"), space, 3, data);
else
{
printf("Write undefined port %02x\n",offset+0x60);
}
printf("Write undefined port %02x\n",offset+0x60);
}
else
{
@ -260,10 +236,7 @@ static ADDRESS_MAP_START( apc_io, AS_IO, 16, apc_state )
// ADDRESS_MAP_GLOBAL_MASK(0xff)
AM_RANGE(0x00, 0x1f) AM_READWRITE8(apc_dma_r, apc_dma_w, 0x00ff)
AM_RANGE(0x20, 0x23) AM_DEVREADWRITE8_LEGACY("pic8259_master", pic8259_r, pic8259_w, 0x00ff) // i8259
AM_RANGE(0x28, 0x2b) AM_READWRITE8(apc_port_28_r, apc_port_28_w, 0xffff)
AM_RANGE(0x2e, 0x2f) AM_WRITE8(apc_port_2e_w, 0x00ff)
// 0x2b RTC counter port 0
// 0x2f RTC counter mode 0 (w)
AM_RANGE(0x28, 0x2f) AM_READWRITE8(apc_port_28_r, apc_port_28_w, 0xffff)
// 0x30, 0x37 serial port 0/1 (i8251) (even/odd)
// 0x38, 0x3f DMA extended address
AM_RANGE(0x40, 0x43) AM_READWRITE8(apc_gdc_r, apc_gdc_w, 0xffff)
@ -274,8 +247,6 @@ static ADDRESS_MAP_START( apc_io, AS_IO, 16, apc_state )
// 0x5e APU status/command
AM_RANGE(0x60, 0x67) AM_READWRITE8(apc_port_60_r, apc_port_60_w, 0xffff)
// 0x60 Melody Processing Unit
// 0x61 RTC counter port 1
// 0x67 RTC counter mode 1 (w)
// AM_RANGE(0x68, 0x6f) i8255 , printer port (A: status (R) B: data (W) C: command (W))
// AM_DEVREADWRITE8("upd7220_btm", upd7220_device, read, write, 0x00ff)
ADDRESS_MAP_END