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vic20: Emulated the Data 20 Display Manager 40/80 column video cartridge. [Curt Coder]
This commit is contained in:
Curt Coder
parent
07f104af68
commit
f419eba57e
6 changed files with 438 additions and 0 deletions
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@ -3908,4 +3908,18 @@
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</dataarea>
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</part>
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</software>
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<software name="data20dm">
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<description>Data 20 Display Manager</description>
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<year>1982</year>
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<publisher>Data 20 Corporation</publisher>
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<info name="usage" value="SYS 40969 for 40 column mode, SYS 40972 for 80 column mode, SYS 40975 for VIC mode, SYS 40978 to restart 40/80 column mode" />
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<sharedfeat name="compatibility" value="NTSC,PAL"/>
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<part name="cart" interface="vic1001_cart">
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<feature name="slot" value="videopak" />
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<dataarea name="blk5" size="0x800">
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<rom name="data20.bin" size="0x800" crc="b7b1899f" sha1="aac8388d16d789126a917958282e9bc6da1038c6" offset="0" />
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</dataarea>
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</part>
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</software>
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</softwarelist>
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@ -71,4 +71,17 @@
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</part>
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</software>
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<software name="data20dm">
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<description>Data 20 Display Manager</description>
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<year>1982</year>
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<publisher>Data 20 Corporation</publisher>
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<sharedfeat name="compatibility" value="NTSC,PAL"/>
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<sharedfeat name="requirement" value="vic1001_cart:data20dm"/>
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<part name="flop1" interface="floppy_5_25">
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<dataarea name="flop" size="174848">
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<rom name="data20.d64" size="174848" crc="06664680" sha1="1586afa380272d333801992c829707e26f81c455" offset="0" />
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</dataarea>
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</part>
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</software>
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</softwarelist>
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@ -1427,6 +1427,8 @@ if (BUSES["VIC20"]~=null) then
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MAME_DIR .. "src/devices/bus/vic20/vic1112.h",
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MAME_DIR .. "src/devices/bus/vic20/vic1210.cpp",
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MAME_DIR .. "src/devices/bus/vic20/vic1210.h",
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MAME_DIR .. "src/devices/bus/vic20/videopak.cpp",
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MAME_DIR .. "src/devices/bus/vic20/videopak.h",
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MAME_DIR .. "src/devices/bus/vic20/speakeasy.cpp",
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MAME_DIR .. "src/devices/bus/vic20/speakeasy.h",
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MAME_DIR .. "src/devices/bus/vic20/user.cpp",
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@ -202,6 +202,7 @@ void vic20_expansion_slot_device::cd_w(address_space &space, offs_t offset, uint
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#include "vic1111.h"
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#include "vic1112.h"
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#include "vic1210.h"
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#include "videopak.h"
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#include "speakeasy.h"
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SLOT_INTERFACE_START( vic20_expansion_cards )
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@ -211,6 +212,7 @@ SLOT_INTERFACE_START( vic20_expansion_cards )
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SLOT_INTERFACE("16k", VIC1111)
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SLOT_INTERFACE("fe3", VIC20_FE3)
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SLOT_INTERFACE("speakez", VIC20_SPEAKEASY)
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SLOT_INTERFACE("videopak", VIC20_VIDEO_PAK)
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// the following need ROMs from the software list
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SLOT_INTERFACE_INTERNAL("standard", VIC20_STD)
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336
src/devices/bus/vic20/videopak.cpp
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336
src/devices/bus/vic20/videopak.cpp
Normal file
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@ -0,0 +1,336 @@
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// license:BSD-3-Clause
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// copyright-holders:Curt Coder
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/**********************************************************************
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Data 20 Corporation Video Pak cartridge emulation
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aka Data 20 Display Manager aka Protecto 40/80
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**********************************************************************/
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#include "videopak.h"
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//**************************************************************************
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// MACROS/CONSTANTS
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//**************************************************************************
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#define VIDEORAM_SIZE 0x800
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#define RAM_SIZE 0x10000
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#define MC6845_TAG "mc6845"
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#define MC6845_SCREEN_TAG "screen80"
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//**************************************************************************
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// DEVICE DEFINITIONS
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//**************************************************************************
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const device_type VIC20_VIDEO_PAK = &device_creator<vic20_video_pak_t>;
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//-------------------------------------------------
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// ROM( videopak )
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//-------------------------------------------------
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ROM_START( videopak )
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ROM_REGION( 0x800, MC6845_TAG, 0 )
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// ROM has been borrowed from the C64 XL80 cartridge
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ROM_LOAD( "chargen", 0x000, 0x800, BAD_DUMP CRC(9edf5e58) SHA1(4b244e6d94a7653a2e52c351589f0b469119fb04) )
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ROM_END
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//-------------------------------------------------
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// rom_region - device-specific ROM region
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//-------------------------------------------------
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const tiny_rom_entry *vic20_video_pak_t::device_rom_region() const
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{
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return ROM_NAME( videopak );
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}
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//-------------------------------------------------
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// mc6845
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//-------------------------------------------------
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MC6845_UPDATE_ROW( vic20_video_pak_t::crtc_update_row )
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{
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const pen_t *pen = m_palette->pens();
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for (int column = 0; column < x_count; column++)
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{
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uint8_t code = m_videoram[((ma + column) & 0x7ff)];
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uint16_t addr = (code << 3) | (ra & 0x07);
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uint8_t data = m_char_rom->base()[addr & 0x7ff];
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if (column == cursor_x)
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{
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data = 0xff;
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}
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for (int bit = 0; bit < 8; bit++)
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{
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int x = (column * 8) + bit;
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int color = BIT(data, 7) && de;
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bitmap.pix32(vbp + y, hbp + x) = pen[color];
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data <<= 1;
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}
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}
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}
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//-------------------------------------------------
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// GFXDECODE( vic20_video_pak )
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//-------------------------------------------------
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static GFXDECODE_START( vic20_video_pak )
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GFXDECODE_ENTRY(MC6845_TAG, 0x0000, gfx_8x8x1, 0, 1)
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GFXDECODE_END
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//-------------------------------------------------
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// MACHINE_CONFIG_FRAGMENT( vic20_video_pak )
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//-------------------------------------------------
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static MACHINE_CONFIG_FRAGMENT( vic20_video_pak )
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MCFG_SCREEN_ADD_MONOCHROME(MC6845_SCREEN_TAG, RASTER, rgb_t::white())
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MCFG_SCREEN_UPDATE_DEVICE(MC6845_TAG, h46505_device, screen_update)
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MCFG_SCREEN_SIZE(80*8, 24*8)
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MCFG_SCREEN_VISIBLE_AREA(0, 80*8-1, 0, 24*8-1)
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MCFG_SCREEN_REFRESH_RATE(50)
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MCFG_GFXDECODE_ADD("gfxdecode", "palette", vic20_video_pak)
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MCFG_PALETTE_ADD_MONOCHROME("palette")
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MCFG_MC6845_ADD(MC6845_TAG, H46505, MC6845_SCREEN_TAG, XTAL_14_31818MHz / 8)
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MCFG_MC6845_SHOW_BORDER_AREA(true)
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MCFG_MC6845_CHAR_WIDTH(8)
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MCFG_MC6845_UPDATE_ROW_CB(vic20_video_pak_t, crtc_update_row)
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MACHINE_CONFIG_END
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//-------------------------------------------------
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// machine_config_additions - device-specific
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// machine configurations
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//-------------------------------------------------
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machine_config_constructor vic20_video_pak_t::device_mconfig_additions() const
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{
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return MACHINE_CONFIG_NAME( vic20_video_pak );
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}
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//**************************************************************************
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// LIVE DEVICE
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//**************************************************************************
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//-------------------------------------------------
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// vic20_video_pak_t - constructor
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//-------------------------------------------------
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vic20_video_pak_t::vic20_video_pak_t(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
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device_t(mconfig, VIC20_VIDEO_PAK, "Data 20 Video Pak", tag, owner, clock, "videopak", __FILE__),
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device_vic20_expansion_card_interface(mconfig, *this),
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m_crtc(*this, MC6845_TAG),
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m_palette(*this, "palette"),
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m_char_rom(*this, MC6845_TAG),
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m_videoram(*this, "videoram"),
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m_ram(*this, "ram")
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{
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}
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//-------------------------------------------------
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// device_start - device-specific startup
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//-------------------------------------------------
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void vic20_video_pak_t::device_start()
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{
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// allocate memory
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m_videoram.allocate(VIDEORAM_SIZE);
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m_ram.allocate(RAM_SIZE);
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}
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//-------------------------------------------------
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// device_reset - device-specific reset
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//-------------------------------------------------
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void vic20_video_pak_t::device_reset()
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{
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}
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//-------------------------------------------------
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// vic20_cd_r - cartridge data read
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//-------------------------------------------------
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uint8_t vic20_video_pak_t::vic20_cd_r(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
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{
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if (!m_ram_enable)
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{
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if (m_bank_size)
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{
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if (!blk1)
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{
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offs_t addr = m_bank_msb << 15 | m_bank_lsb << 14 | offset;
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data = m_ram[addr];
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}
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if (!blk2)
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{
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offs_t addr = m_bank_msb << 15 | m_bank_lsb << 14 | 0x2000 | offset;
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data = m_ram[addr];
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}
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}
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else
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{
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if (!blk1)
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{
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offs_t addr = m_bank_msb << 15 | offset;
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data = m_ram[addr];
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}
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if (!blk2)
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{
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offs_t addr = m_bank_msb << 15 | 0x2000 | offset;
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data = m_ram[addr];
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}
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if (!blk3)
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{
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offs_t addr = m_bank_msb << 15 | 0x4000 | offset;
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data = m_ram[addr];
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}
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}
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}
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if (!blk5)
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{
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switch ((offset >> 11) & 0x03)
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{
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case 0:
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data = m_blk5[offset & 0x7ff];
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break;
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case 3:
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data = m_videoram[offset & 0x7ff];
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break;
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}
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}
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if (!io2)
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{
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if (offset == 0x1bf9)
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{
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data = m_crtc->register_r(space, 0);
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}
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}
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return data;
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}
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//-------------------------------------------------
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// vic20_cd_w - cartridge data write
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//-------------------------------------------------
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void vic20_video_pak_t::vic20_cd_w(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3)
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{
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if (!m_ram_enable)
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{
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if (m_bank_size)
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{
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if (!blk1)
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{
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offs_t addr = m_bank_msb << 15 | m_bank_lsb << 14 | offset;
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m_ram[addr] = data;
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}
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if (!blk2)
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{
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offs_t addr = m_bank_msb << 15 | m_bank_lsb << 14 | 0x2000 | offset;
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m_ram[addr] = data;
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}
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}
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else
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{
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if (!blk1)
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{
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offs_t addr = m_bank_msb << 15 | offset;
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m_ram[addr] = data;
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}
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if (!blk2)
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{
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offs_t addr = m_bank_msb << 15 | 0x2000 | offset;
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m_ram[addr] = data;
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}
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if (!blk3)
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{
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offs_t addr = m_bank_msb << 15 | 0x4000 | offset;
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m_ram[addr] = data;
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}
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}
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}
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if (!blk5)
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{
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switch ((offset >> 11) & 0x03)
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{
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case 3:
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m_videoram[offset & 0x7ff] = data;
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break;
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}
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}
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if (!io2)
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{
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switch (offset)
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{
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case 0x1bf8:
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m_crtc->address_w(space, 0, data);
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break;
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case 0x1bf9:
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m_crtc->register_w(space, 0, data);
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break;
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case 0x1bfc:
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/*
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bit description
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0 0 = upper case, 1 = lower case
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1 bank size: 0 = 2x24KB, 1 = 4x16KB
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2 16KB mode address LSB
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3 memory address MSB
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4 0 = enable RAM, 1 = disable RAM
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5 0 = 40 columns, 1 = 80 columns (Data 20 Video Manager)
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*/
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m_case = BIT(data, 0);
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m_bank_size = BIT(data, 1);
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m_bank_lsb = BIT(data, 2);
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m_bank_msb = BIT(data, 3);
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m_ram_enable = BIT(data, 4);
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m_columns = BIT(data, 5);
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break;
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}
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}
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}
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71
src/devices/bus/vic20/videopak.h
Normal file
71
src/devices/bus/vic20/videopak.h
Normal file
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@ -0,0 +1,71 @@
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// license:BSD-3-Clause
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// copyright-holders:Curt Coder
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/**********************************************************************
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Data 20 Corporation Video Pak cartridge emulation
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aka Data 20 Display Manager aka Protecto 40/80
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**********************************************************************/
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#pragma once
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#ifndef __VIC20_VIDEO_PAK__
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#define __VIC20_VIDEO_PAK__
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#include "emu.h"
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#include "exp.h"
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#include "video/mc6845.h"
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//**************************************************************************
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// TYPE DEFINITIONS
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//**************************************************************************
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// ======================> vic20_video_pak_t
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class vic20_video_pak_t : public device_t,
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public device_vic20_expansion_card_interface
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{
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public:
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// construction/destruction
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vic20_video_pak_t(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
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// optional information overrides
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virtual const tiny_rom_entry *device_rom_region() const override;
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virtual machine_config_constructor device_mconfig_additions() const override;
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// not really public
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MC6845_UPDATE_ROW( crtc_update_row );
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protected:
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// device-level overrides
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virtual void device_start() override;
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virtual void device_reset() override;
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// device_vic20_expansion_card_interface overrides
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virtual uint8_t vic20_cd_r(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) override;
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virtual void vic20_cd_w(address_space &space, offs_t offset, uint8_t data, int ram1, int ram2, int ram3, int blk1, int blk2, int blk3, int blk5, int io2, int io3) override;
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private:
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required_device<h46505_device> m_crtc;
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required_device<palette_device> m_palette;
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required_memory_region m_char_rom;
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optional_shared_ptr<uint8_t> m_videoram;
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optional_shared_ptr<uint8_t> m_ram;
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bool m_case;
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bool m_bank_size;
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bool m_bank_lsb;
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bool m_bank_msb;
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bool m_ram_enable;
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bool m_columns;
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};
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// device type definition
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extern const device_type VIC20_VIDEO_PAK;
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#endif
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