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gamate: fix power up RAM contents (#5711)

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* gamate: fix power up RAM contents

According to reports in the cc65 project, it appears that the RAM contains
0xFFs at power up. See https://github.com/cc65/cc65/issues/941.
Adapt the driver to account for this.

* gamate.c: don't use magical number for memory size
This commit is contained in:
Christian Groessler 2019-10-06 14:27:21 +02:00 committed by Vas Crabb
parent e37179f730
commit 071696acec
1 changed files with 4 additions and 1 deletions
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5
src/mame/drivers/gamate.cpp
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@ -30,6 +30,7 @@ public:
, m_cartslot(*this, "cartslot")
, m_io_joy(*this, "JOY")
, m_bios(*this, "bios")
, m_ram(*this, "ram")
{ }
void gamate(machine_config &config);
@ -62,6 +63,7 @@ private:
required_device<gamate_cart_slot_device> m_cartslot;
required_ioport m_io_joy;
required_shared_ptr<uint8_t> m_bios;
required_shared_ptr<uint8_t> m_ram;
emu_timer *timer1;
emu_timer *timer2;
};
@ -116,7 +118,7 @@ READ8_MEMBER(gamate_state::read_cart)
void gamate_state::gamate_mem(address_map &map)
{
map(0x0000, 0x03ff).mirror(0x1c00).ram();
map(0x0000, 0x03ff).mirror(0x1c00).ram().share("ram");
map(0x4000, 0x400f).mirror(0x03f0).rw(FUNC(gamate_state::sound_r), FUNC(gamate_state::sound_w));
map(0x4400, 0x4400).mirror(0x03ff).portr("JOY");
map(0x4800, 0x4800).mirror(0x03ff).r(FUNC(gamate_state::gamate_nmi_r));
@ -150,6 +152,7 @@ void gamate_state::init_gamate()
void gamate_state::machine_start()
{
memset(m_ram, 0xff, m_ram.bytes()); /* memory seems to contain 0xff at power up */
timer2->enable(true);
timer2->reset(m_maincpu->cycles_to_attotime(1000));