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(MESS) a7800: more accurate POKEY accesses make Beef Drop happier. nw.

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This commit is contained in:
Fabio Priuli 2014-09-06 10:30:13 +00:00
parent d72b678f73
commit ad5d4ba441
2 changed files with 29 additions and 3 deletions
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30
src/emu/bus/a7800/rom.c
View File

@ -7,8 +7,11 @@
- pokey or not
- 9 banks or not
etc...
But we might merge many of these if they become too many (e.g. could there be banked 32L RAM also
in a 9banks cart or in a cart with no bankswitch?)
But we might merge many of these if they become too many
TODO:
- Are POKEY regs readable somewhere in SG 144K + POKEY homebrew? How do they detect
the POKEY otherwise?!?
***********************************************************************************************************/
@ -182,6 +185,17 @@ READ8_MEMBER(a78_rom_device::read_40xx)
-------------------------------------------------*/
READ8_MEMBER(a78_rom_pokey_device::read_40xx)
{
if (offset < 0x4000)
return m_pokey->read(space, offset & 0x0f);
if (offset + 0x4000 < m_base_rom)
return 0xff;
else
return m_rom[offset + 0x4000 - m_base_rom];
}
WRITE8_MEMBER(a78_rom_pokey_device::write_40xx)
{
if (offset < 0x4000)
@ -233,10 +247,20 @@ WRITE8_MEMBER(a78_rom_sg_device::write_40xx)
Carts with SuperGame bankswitch + POKEY chip
As above + Pokey chip access
GAMES: Commando
GAMES: Commando and Barnyard Blaster
-------------------------------------------------*/
READ8_MEMBER(a78_rom_sg_pokey_device::read_40xx)
{
if (offset < 0x4000)
return m_pokey->read(space, offset & 0x0f);
else if (offset < 0x8000)
return m_rom[(offset & 0x3fff) + (m_bank * 0x4000)];
else
return m_rom[(offset & 0x3fff) + (m_bank_mask * 0x4000)]; // last bank
}
WRITE8_MEMBER(a78_rom_sg_pokey_device::write_40xx)
{
if (offset < 0x4000)

2
src/emu/bus/a7800/rom.h
View File

@ -36,6 +36,7 @@ public:
virtual machine_config_constructor device_mconfig_additions() const;
// reading and writing
virtual DECLARE_READ8_MEMBER(read_40xx);
virtual DECLARE_WRITE8_MEMBER(write_40xx);
protected:
@ -77,6 +78,7 @@ public:
virtual machine_config_constructor device_mconfig_additions() const;
// reading and writing
virtual DECLARE_READ8_MEMBER(read_40xx);
virtual DECLARE_WRITE8_MEMBER(write_40xx);
protected: