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ti99: Fixed RESET behavior of Horizon RAM disk.

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This commit is contained in:
Michael Zapf 2024-04-23 02:09:57 +02:00
parent fe68edec44
commit bdbefa3860
2 changed files with 25 additions and 0 deletions
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21
src/devices/bus/ti99/peb/horizon.cpp
View File

@ -134,6 +134,7 @@
#define LOG_ORAM (1U << 6) // outside of RAM chips
#define LOG_CRU (1U << 7) // CRU
#define LOG_PAGE (1U << 8) // Page access
#define LOG_LINE (1U << 9) // Control lines (like RESET)
#define VERBOSE (LOG_GENERAL | LOG_CONFIG | LOG_WARN)
@ -167,6 +168,7 @@ horizon_ramdisk_device::horizon_ramdisk_device(const machine_config &mconfig, co
m_phoenix_split(false),
m_hideswitch(false),
m_rambo_supported(false),
m_reset_in(false),
m_modified(false),
m_page(0),
m_bank(0),
@ -392,6 +394,20 @@ void horizon_ramdisk_device::get_address_prefix()
}
}
void horizon_ramdisk_device::reset_in(int state)
{
m_reset_in = (state==ASSERT_LINE);
// While the hideswitch is on, the /RESET line is pulled down
if (!m_hideswitch)
{
LOGMASKED(LOG_LINE, "RESET line=%d\n", m_reset_in);
// Reset the 259 latches
m_crulatch_u3->clear(m_reset_in);
m_crulatch_u4->clear(m_reset_in);
}
}
void horizon_ramdisk_device::device_start(void)
{
machine().save().register_postload(save_prepost_delegate(FUNC(horizon_ramdisk_device::get_address_prefix),this));
@ -420,6 +436,11 @@ INPUT_CHANGED_MEMBER( horizon_ramdisk_device::hs_changed )
{
LOGMASKED(LOG_CONFIG, "Hideswitch changed to %d\n", newval);
m_hideswitch = (newval!=0);
if (!m_reset_in)
{
m_crulatch_u3->clear(m_hideswitch);
m_crulatch_u4->clear(m_hideswitch);
}
}
else
{

4
src/devices/bus/ti99/peb/horizon.h
View File

@ -46,6 +46,8 @@ protected:
virtual bool nvram_write(util::write_stream &file) override;
virtual bool nvram_can_write() const override;
void reset_in(int state) override;
private:
required_device<ram_device> m_ram;
required_device<ram_device> m_dsrram;
@ -66,6 +68,8 @@ private:
bool m_hideswitch;
bool m_rambo_supported;
bool m_reset_in;
// Do not save if nothing was modified.
bool m_modified;