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commodore/c65.cpp: implement DMAgic DIR
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This commit is contained in:
angelosa 2024-08-01 17:45:18 +02:00
parent d3510c2deb
commit 7d709c9cfe
1 changed files with 36 additions and 10 deletions
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46
src/mame/commodore/c65.cpp
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@ -12,6 +12,8 @@ TODO:
- Complete interrupts;
- F011 FDC;
- C=64 mode (with "GO64" at BASIC prompt);
- bios 0 detects an expansion RAM without checking REC first and no matter if there's
effectively a RAM bank available or not, supposed to bus error or just buggy/hardwired code?
===================================================================================================
References:
@ -75,9 +77,13 @@ private:
dma_state_t m_state;
u32 m_src, m_dst, m_length, m_command, m_modulo;
u8 m_src_mode, m_dst_mode;
bool m_chained_transfer;
emu_timer *m_dma_timer;
void check_state(int next_cycles);
void increment_src();
void increment_dst();
};
DEFINE_DEVICE_TYPE(DMAGIC_F018, dmagic_f018_device, "dmagic_f018", "DMAgic F018 Gate Array")
@ -118,6 +124,19 @@ void dmagic_f018_device::check_state(int next_cycles)
}
}
void dmagic_f018_device::increment_src()
{
const int src_dir = BIT(m_src_mode, 2) ? -1 : +1;
m_src = ((m_src + src_dir) & 0xffff) | (m_src & 0xf'0000);
}
void dmagic_f018_device::increment_dst()
{
const int dst_dir = BIT(m_dst_mode, 2) ? -1 : +1;
m_dst = ((m_dst + dst_dir) & 0xffff) | (m_dst & 0xf'0000);
}
TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
{
switch(m_state)
@ -158,7 +177,10 @@ TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
m_dmalist_address = address;
m_state = (dma_state_t)(m_command & 3);
logerror("DMAgic %s %06x -> %06x %04x %02x (CHAIN=%s)\n"
m_src_mode = m_src >> 20;
m_dst_mode = m_dst >> 20;
logerror("DMAgic %s [%06x] -> [%06x] length = %04x modulo = %02x (CHAIN=%s)\n"
, dma_cmd_string[m_command & 3]
, m_src
, m_dst
@ -172,9 +194,10 @@ TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
// x--- I/O select
// -x-- DIR
// \- decrements instead of increment, used by "LIST"
// --x- MOD
// ---x HOLD
if ((m_src & 0xf0'0000 || m_dst & 0xf0'0000) && m_length != 1)
if ((m_src_mode & 0xb || m_dst_mode & 0xb) && m_length != 1)
{
popmessage("DMAgic: unhandled source %06x dst %06x length %05x", m_src, m_dst, m_length);
}
@ -188,8 +211,8 @@ TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
// or length == 50 (for scrolling vertical text, cfr. c64dx)
case dma_state_t::COPY: {
m_space->write_byte(m_dst & 0xf'ffff, m_space->read_byte(m_src & 0xf'ffff));
m_src = ((m_src + 1) & 0xffff) | (m_src & 0xf'0000);
m_dst = ((m_dst + 1) & 0xffff) | (m_dst & 0xf'0000);
increment_src();
increment_dst();
m_length --;
check_state(2);
break;
@ -205,8 +228,8 @@ TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
const u8 tmp_dst = m_space->read_byte(m_dst & 0xf'ffff);
m_space->write_byte(m_src & 0xf'ffff, tmp_dst);
m_space->write_byte(m_dst & 0xf'ffff, tmp_src);
m_src = ((m_src + 1) & 0xffff) | (m_src & 0xf'0000);
m_dst = ((m_dst + 1) & 0xffff) | (m_dst & 0xf'0000);
increment_src();
increment_dst();
m_length --;
check_state(4);
break;
@ -214,7 +237,7 @@ TIMER_CALLBACK_MEMBER(dmagic_f018_device::execute_cb)
case dma_state_t::FILL:
m_space->write_byte(m_dst & 0xf'ffff, m_src & 0xff);
m_dst = ((m_dst + 1) & 0xffff) | (m_dst & 0xf'0000);
increment_dst();
m_length --;
check_state(1);
break;
@ -566,15 +589,17 @@ void c65_state::cia0_portb_w(uint8_t data)
void c65_state::c65_map(address_map &map)
{
map.unmap_value_high();
map(0x00000, 0x07fff).ram().share("work_ram");
map(0x08000, 0x0bfff).rom().region("ipl", 0x08000);
map(0x0c800, 0x0cfff).rom().region("ipl", 0x0c800);
map(0x0d000, 0x0d07f).m(*this, FUNC(c65_state::vic4567_map));
// 0x0d080, 0x0d09f FDC
map(0x0d080, 0x0d09f).lr8(NAME([] (offs_t offset) { return 0; }));
// 0x0d0a0, 0x0d0ff Ram Expansion Control (REC)
map(0x0d100, 0x0d1ff).ram().w(FUNC(c65_state::PalRed_w)).share("redpal");// 0x0d100, 0x0d1ff Red Palette
map(0x0d200, 0x0d2ff).ram().w(FUNC(c65_state::PalGreen_w)).share("greenpal"); // 0x0d200, 0x0d2ff Green Palette
map(0x0d300, 0x0d3ff).ram().w(FUNC(c65_state::PalBlue_w)).share("bluepal"); // 0x0d300, 0x0d3ff Blue Palette
map(0x0d100, 0x0d1ff).ram().w(FUNC(c65_state::PalRed_w)).share("redpal");
map(0x0d200, 0x0d2ff).ram().w(FUNC(c65_state::PalGreen_w)).share("greenpal");
map(0x0d300, 0x0d3ff).ram().w(FUNC(c65_state::PalBlue_w)).share("bluepal");
// 0x0d400, 0x0d4*f Right SID
// keyboard hold left shift will read to $d484 (?)
map(0x0d400, 0x0d41f).mirror(0x80).rw(m_sid[1], FUNC(mos6581_device::read), FUNC(mos6581_device::write));
@ -602,6 +627,7 @@ void c65_state::c65_map(address_map &map)
map(0x20000, 0x3ffff).rom().region("ipl", 0);
// 0x40000, 0x7ffff cart expansion
// 0x80000, 0xfffff RAM expansion
// map(0x80000, 0xfffff).ram();
}