Sprinter/mame
2
0
Fork 0
mirror of https://github.com/holub/mame synced 2025-04-23 00:39:36 +03:00
Code Issues Actions 1 Packages Projects Releases Wiki Activity

apple2gs: don't reselect drives on writes to DISKREG (github issue #7852) [R. Belmont]

Browse Source
This commit is contained in:
arbee 2021-03-13 22:55:01 -05:00
parent fe20679f11
commit 4171bbadd3
1 changed files with 9 additions and 40 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

49
src/mame/drivers/apple2gs.cpp
View File

@ -327,8 +327,8 @@ private:
enum disk_reg_bits
{
DISKREG_35HEADSEL = 0x80, // head select for 3.5" "dumb" Sony drives
DISKREG_35ENABLE = 0x40 // 1 to enable 3.5" drives, 0 to chain through to 5.25"
DISKREG_HDSEL = 7, // select signal for 3.5" Sony drives
DISKREG_35SEL = 6 // 1 to enable 3.5" drives, 0 to chain through to 5.25"
};
enum irq_sources
@ -2835,41 +2835,9 @@ void apple2gs_state::c000_w(offs_t offset, u8 data)
m_slotromsel = data;
break;
case 0x31: // DISKREG
if (BIT(m_diskreg, 6) != BIT(data, 6))
if ((m_cur_floppy) && (BIT(data, DISKREG_35SEL)))
{
if (m_devsel == 1)
{
if (!BIT(data, 6))
{
m_cur_floppy = m_floppy[0]->get_device();
}
else
{
m_cur_floppy = m_floppy[2]->get_device();
}
}
else if (m_devsel == 2)
{
if (!BIT(data, 6))
{
m_cur_floppy = m_floppy[1]->get_device();
}
else
{
m_cur_floppy = m_floppy[3]->get_device();
}
}
else
{
m_cur_floppy = nullptr;
}
m_iwm->set_floppy(m_cur_floppy);
}
if (m_cur_floppy)
{
m_cur_floppy->ss_w(BIT(data, 7));
m_cur_floppy->ss_w(BIT(data, DISKREG_HDSEL));
}
m_diskreg = data;
break;
@ -4464,7 +4432,7 @@ void apple2gs_state::devsel_w(uint8_t devsel)
m_devsel = devsel;
if (m_devsel == 1)
{
if (!BIT(m_diskreg, 6))
if (!BIT(m_diskreg, DISKREG_35SEL))
{
m_cur_floppy = m_floppy[0]->get_device();
}
@ -4475,7 +4443,7 @@ void apple2gs_state::devsel_w(uint8_t devsel)
}
else if (m_devsel == 2)
{
if (!BIT(m_diskreg, 6))
if (!BIT(m_diskreg, DISKREG_35SEL))
{
m_cur_floppy = m_floppy[1]->get_device();
}
@ -4489,9 +4457,10 @@ void apple2gs_state::devsel_w(uint8_t devsel)
m_cur_floppy = nullptr;
}
m_iwm->set_floppy(m_cur_floppy);
if (m_cur_floppy)
if ((m_cur_floppy) && (BIT(m_diskreg, DISKREG_35SEL)))
{
m_cur_floppy->ss_w(BIT(m_diskreg, 7));
m_cur_floppy->ss_w(BIT(m_diskreg, DISKREG_HDSEL));
}
}