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hp9845: RAM size is now configurable by -ram option

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This commit is contained in:
fulivi 2017-02-12 16:18:35 +01:00 committed by Vas Crabb
parent e0c694b771
commit 6474fcd7d8
2 changed files with 68 additions and 6 deletions
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71
src/mame/drivers/hp9845.cpp
View File

@ -268,7 +268,8 @@ hp9845b_state::hp9845b_state(const machine_config &mconfig, device_type type, co
m_io_slot0(*this , "slot0"),
m_io_slot1(*this , "slot1"),
m_io_slot2(*this , "slot2"),
m_io_slot3(*this , "slot3")
m_io_slot3(*this , "slot3"),
m_ram(*this , RAM_TAG)
{
}
@ -283,15 +284,41 @@ uint32_t hp9845b_state::screen_update(screen_device &screen, bitmap_rgb32 &bitma
return 0;
}
void hp9845b_state::setup_ram_block(unsigned block , unsigned offset)
{
unsigned block_addr = block << 16;
m_lpu->space(AS_PROGRAM).install_ram(block_addr , block_addr + 0x7fff , m_ram->pointer() + offset);
m_ppu->space(AS_PROGRAM).install_ram(block_addr , block_addr + 0x7fff , m_ram->pointer() + offset);
}
void hp9845b_state::machine_start()
{
machine().first_screen()->register_screen_bitmap(m_bitmap);
m_chargen = memregion("chargen")->base();
m_chargen = memregion("chargen")->base();
m_optional_chargen = memregion("optional_chargen")->base();
m_graphic_mem.resize(GVIDEO_MEM_SIZE);
m_graphic_mem.resize(GVIDEO_MEM_SIZE);
// setup RAM dynamically for -ramsize
// 0K..64K
setup_ram_block(0 , 0);
if (m_ram->size() >= 192 * 1024) {
// 64K..192K
setup_ram_block(004 , 0x10000);
setup_ram_block(006 , 0x20000);
}
if (m_ram->size() >= 320 * 1024) {
// 192K..320K
setup_ram_block(010 , 0x30000);
setup_ram_block(012 , 0x40000);
}
if (m_ram->size() >= 448 * 1024) {
// 320K..448K
setup_ram_block(014 , 0x50000);
setup_ram_block(016 , 0x60000);
}
}
void hp9845b_state::device_reset()
@ -1039,14 +1066,40 @@ static MACHINE_CONFIG_START( hp9835a, hp9845_state )
MCFG_SOFTWARE_LIST_ADD("optrom_list", "hp9835a_rom")
MACHINE_CONFIG_END
/*
Global memory map in blocks of 32 kwords / 64 kbytes each:
block 0: 0x000000 - 0x007fff (LPU RAM)
block 1: 0x008000 - 0x00ffff (PPU RAM, only 0x00c000 - 0x00ffff used)
block 2: 0x010000 - 0x017fff (unused)
block 3: 0x018000 - 0x01ffff (LPU system ROM)
block 4: 0x020000 - 0x027fff (LPU RAM)
block 5: 0x028000 - 0x02ffff (PPU system ROM)
block 6: 0x030000 - 0x037fff (LPU RAM)
block 7: 0x038000 - 0x03ffff (LPU option ROM)
block 10: 0x040000 - 0x047fff (LPU RAM)
block 11: 0x048000 - 0x04ffff (PPU option ROM)
block 12: 0x050000 - 0x057fff (LPU RAM)
block 13: 0x058000 - 0x05ffff (LPU option ROM)
block 14: 0x060000 - 0x067fff (LPU RAM)
block 15: 0x068000 - 0x06ffff (PPU option ROM)
block 16: 0x070000 - 0x077fff (LPU RAM)
block 17: 0x078000 - 0x07ffff (unused)
notes:
- all block numbers are octal
- blocks 20 to 76 are reserved for 512 kbyte RAM boards (p/n 09845-66590)
- block 45 is reserved for the Test ROM
- memory addresses are continuous (for convenience, the mapping below uses block numbers as
address part above 0xffff, so there are gaps between 0x8000 and 0xffff which are masked out).
- all LPU RAM is dynamically mapped at machine start according to -ramsize option
*/
static ADDRESS_MAP_START(global_mem_map , AS_PROGRAM , 16 , hp9845b_state)
ADDRESS_MAP_GLOBAL_MASK(0x3f7fff)
ADDRESS_MAP_UNMAP_LOW
AM_RANGE(0x000000 , 0x007fff) AM_RAM AM_SHARE("lpu_ram")
AM_RANGE(0x014000 , 0x017fff) AM_RAM AM_SHARE("ppu_ram")
AM_RANGE(0x020000 , 0x027fff) AM_RAM AM_SHARE("lpu_02_ram")
AM_RANGE(0x030000 , 0x037fff) AM_ROM AM_REGION("lpu" , 0)
AM_RANGE(0x040000 , 0x047fff) AM_RAM AM_SHARE("lpu_04_ram")
AM_RANGE(0x050000 , 0x057fff) AM_ROM AM_REGION("ppu" , 0)
ADDRESS_MAP_END
@ -1129,10 +1182,16 @@ static MACHINE_CONFIG_START( hp9845b, hp9845b_state )
MCFG_SOFTWARE_LIST_ADD("optrom_list", "hp9845b_rom")
// I/O slots
MCFG_HP9845_IO_SLOT_ADD("slot0")
MCFG_HP9845_IO_SLOT_ADD("slot1")
MCFG_HP9845_IO_SLOT_ADD("slot2")
MCFG_HP9845_IO_SLOT_ADD("slot3")
// LPU memory options
MCFG_RAM_ADD(RAM_TAG)
MCFG_RAM_DEFAULT_SIZE("192K")
MCFG_RAM_EXTRA_OPTIONS("64K, 320K, 448K")
MACHINE_CONFIG_END
ROM_START( hp9845a )

3
src/mame/includes/hp9845.h
View File

@ -11,6 +11,7 @@
#include "sound/beep.h"
#include "bus/hp9845_io/hp9845_io.h"
#include "screen.h"
#include "machine/ram.h"
class hp9845b_state : public driver_device
{
@ -72,7 +73,9 @@ private:
required_device<hp9845_io_slot_device> m_io_slot1;
required_device<hp9845_io_slot_device> m_io_slot2;
required_device<hp9845_io_slot_device> m_io_slot3;
required_device<ram_device> m_ram;
void setup_ram_block(unsigned block , unsigned offset);
void set_video_mar(uint16_t mar);
void video_fill_buff(bool buff_idx);
void video_render_buff(unsigned video_scanline , unsigned line_in_row, bool buff_idx);