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From: Duke [mailto:startaq@gmail.com]

Browse Source 
Sent: Wednesday, February 25, 2009 5:20 AM
To: submit@mamedev.org
Subject: CIA update

Hello,

this patch adds support for the /PC output pin to the CIA emulation.
From the datasheet "/PC will go low for one cycle following a read or write of PORT B.". 
This is needed for centronics printer emulation on the MESS side, but I imagine it would 
simplify/correct the emulation in some MAME amiga drivers as well (mquake.c for example).

--Dirk
This commit is contained in:
Aaron Giles 2009-02-26 09:07:02 +00:00
parent 500f71495c
commit 26dd96003f
7 changed files with 36 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

24
src/emu/machine/6526cia.c
View File

@ -67,6 +67,7 @@ struct _cia_state
{
const device_config *device;
devcb_resolved_write_line irq_func;
devcb_resolved_write_line pc_func;
cia_port port[2];
cia_timer timer[2];
@ -141,6 +142,7 @@ static DEVICE_START( cia )
memset(cia, 0, sizeof(*cia));
cia->device = device;
devcb_resolve_write_line(&cia->irq_func, &intf->irq_func, device);
devcb_resolve_write_line(&cia->pc_func, &intf->pc_func, device);
/* setup ports */
for (p = 0; p < (sizeof(cia->port) / sizeof(cia->port[0])); p++)
@ -272,6 +274,20 @@ static DEVICE_VALIDITY_CHECK( cia )
}
/*-------------------------------------------------
cia_update_pc - pulse /pc output
-------------------------------------------------*/
static void cia_update_pc(const device_config *device)
{
cia_state *cia = get_token(device);
/* this should really be one cycle long */
devcb_call_write_line(&cia->pc_func, 0);
devcb_call_write_line(&cia->pc_func, 1);
}
/*-------------------------------------------------
cia_update_interrupts
-------------------------------------------------*/
@ -651,6 +667,9 @@ READ8_DEVICE_HANDLER( cia_r )
else
data &= ~0x80;
}
/* pulse /PC following the read */
cia_update_pc(device);
}
break;
@ -742,6 +761,11 @@ WRITE8_DEVICE_HANDLER( cia_w )
port->latch = data;
port->out = (data & port->ddr) | (port->in & ~port->ddr);
devcb_call_write8(&port->write, 0, port->out);
/* pulse /PC following the write */
if (offset == CIA_PRB)
cia_update_pc(device);
break;
/* port A/B direction */

2
src/emu/machine/6526cia.h
View File

@ -45,6 +45,8 @@ typedef struct _cia6526_interface cia6526_interface;
struct _cia6526_interface
{
devcb_write_line irq_func;
devcb_write_line pc_func;
int tod_clock;
struct

2
src/mame/drivers/alg.c
View File

@ -378,6 +378,7 @@ INPUT_PORTS_END
static const cia6526_interface cia_0_intf =
{
DEVCB_LINE(amiga_cia_0_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_HANDLER(alg_cia_0_porta_r), DEVCB_HANDLER(alg_cia_0_porta_w) }, /* port A */
@ -388,6 +389,7 @@ static const cia6526_interface cia_0_intf =
static const cia6526_interface cia_1_intf =
{
DEVCB_LINE(amiga_cia_1_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_HANDLER(alg_cia_1_porta_r), DEVCB_HANDLER(alg_cia_1_porta_w), }, /* port A */

2
src/mame/drivers/arcadia.c
View File

@ -260,6 +260,7 @@ INPUT_PORTS_END
static const cia6526_interface cia_0_intf =
{
DEVCB_LINE(amiga_cia_0_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_INPUT_PORT("CIA0PORTA"), DEVCB_HANDLER(arcadia_cia_0_porta_w) }, /* port A */
@ -270,6 +271,7 @@ static const cia6526_interface cia_0_intf =
static const cia6526_interface cia_1_intf =
{
DEVCB_LINE(amiga_cia_1_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_NULL, DEVCB_NULL }, /* port A */

2
src/mame/drivers/cubocd32.c
View File

@ -212,6 +212,7 @@ INPUT_PORTS_END
static const cia6526_interface cia_0_intf =
{
DEVCB_LINE(amiga_cia_0_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_INPUT_PORT("CIA0PORTA"), DEVCB_HANDLER(cd32_cia_0_porta_w) }, /* port A */
@ -222,6 +223,7 @@ static const cia6526_interface cia_0_intf =
static const cia6526_interface cia_1_intf =
{
DEVCB_LINE(amiga_cia_1_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_NULL, DEVCB_NULL }, /* port A */

2
src/mame/drivers/mquake.c
View File

@ -333,6 +333,7 @@ static MACHINE_RESET(mquake)
static const cia6526_interface cia_0_intf =
{
DEVCB_LINE(amiga_cia_0_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_INPUT_PORT("CIA0PORTA"), DEVCB_HANDLER(mquake_cia_0_porta_w) }, /* port A */
@ -343,6 +344,7 @@ static const cia6526_interface cia_0_intf =
static const cia6526_interface cia_1_intf =
{
DEVCB_LINE(amiga_cia_1_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_NULL, DEVCB_NULL }, /* port A */

2
src/mame/drivers/upscope.c
View File

@ -277,6 +277,7 @@ INPUT_PORTS_END
static const cia6526_interface cia_0_intf =
{
DEVCB_LINE(amiga_cia_0_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_NULL, DEVCB_HANDLER(upscope_cia_0_porta_w) }, /* port A */
@ -287,6 +288,7 @@ static const cia6526_interface cia_0_intf =
static const cia6526_interface cia_1_intf =
{
DEVCB_LINE(amiga_cia_1_irq), /* irq_func */
DEVCB_NULL, /* pc_func */
0, /* tod_clock */
{
{ DEVCB_HANDLER(upscope_cia_1_porta_r), DEVCB_HANDLER(upscope_cia_1_porta_w), }, /* port A */