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

hitachi/bml3.cpp: preliminary IG display

Browse Source
This commit is contained in:
angelosa 2024-09-21 01:05:54 +02:00
parent 8727bcc611
commit 16b9a5036c
1 changed files with 41 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

48
src/mame/hitachi/bml3.cpp
View File

@ -11,11 +11,12 @@ References:
- https://github.com/bml3mk5/EmuB-6892/blob/master/src/docs/spec.txt
TODO:
- bml3mk5: complete IG RAM support;
- keyboard break NMI (as per bmjr);
- Move keyboard timer logic as 6845 hsync callback;
- Cassette relay doesn't work properly, issuing a LOAD won't autostart a load;
- Cassette baud rate bump (can switch from 600 to 1200 bauds thru $ffd7);
- implement sound as a bml3bus slot device;
- implement sound as a bus slot device;
- implement RAM expansion as (extra?) bus slots, thru $ffe8;
- soft reset will hang the machine;
- Hitachi MB-S1 support (bumps memory map, adds an extra I/O layer);
@ -115,6 +116,9 @@ protected:
required_device<cpu_device> m_maincpu;
required_device<bml3bus_device> m_bml3bus;
virtual u8 get_attr_mask() { return 0x1f; }
virtual u8 get_ig_mode(u8 attr) { return 0; }
virtual u8 get_ig_dots(u8 tile, u8 ra, u8 xi) { return 0; }
private:
required_region_ptr<u8> m_p_chargen;
required_device<mc6845_device> m_crtc;
@ -215,6 +219,21 @@ protected:
virtual void machine_start() override;
virtual void machine_reset() override;
virtual u8 get_attr_mask() override { return 0x3f; }
virtual u8 get_ig_mode(u8 attr) override { return BIT(attr, 5); }
// NOTE: if IG attribute is enabled then the rest of attribute byte is ignored (no reverse etc.).
// TODO: if IGMODREG is 1 then the resulting tile will be a white square
virtual u8 get_ig_dots(u8 tile, u8 ra, u8 xi) override {
u16 base_offset = tile << 3;
u8 res = 0;
for (int i = 0; i < 3; i++)
{
if (BIT(m_ig_ram[base_offset + ra + i * 0x800], xi))
res |= 1 << i;
}
return res;
}
private:
memory_view m_ig_view;
required_device<gfxdecode_device> m_gfxdecode;
@ -252,11 +271,26 @@ MC6845_UPDATE_ROW( bml3_state::crtc_update_row )
else
mem = (ma + x + ra * x_count/40 * 0x400 -0x400) & 0x3fff;
u8 const color = m_aram[mem] & 7;
bool const reverse = BIT(m_aram[mem], 3) ^ (x == cursor_x);
bool const graphic = BIT(m_aram[mem], 4);
u8 const attr = m_aram[mem];
u8 const rawbits = m_vram[mem];
// HACK: tracer bullet, should be composed in an entirely different way
// This will never be hit by regular l3 being a specific feature of mk5,
// still expect further headaches for S1 support ...
if (get_ig_mode(attr))
{
for(u8 xi = 0; xi < 8; xi++)
{
u8 pen = get_ig_dots(rawbits, ra, 7 - xi);
bitmap.pix(y, x*8+xi) = palette[pen];
}
continue;
}
u8 const color = attr & 7;
bool const reverse = BIT(attr, 3) ^ (x == cursor_x);
bool const graphic = BIT(attr, 4);
u8 dots[2] = { 0, 0 };
if (graphic)
@ -404,7 +438,7 @@ void bml3_state::vram_w(offs_t offset, u8 data)
{
m_vram[offset] = data;
// color ram is 5-bit
m_aram[offset] = m_attr_latch & 0x1f;
m_aram[offset] = m_attr_latch & get_attr_mask();
}
u8 bml3_state::psg_latch_r()