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a2bus: add support for the Grafex-32 uPD7220 video card [Rob Justice, R. Belmont]

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This commit is contained in:
arbee 2021-12-16 21:24:38 -05:00
parent c6d1c58433
commit 10457bb855
4 changed files with 163 additions and 0 deletions
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2
scripts/src/bus.lua
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@ -2571,6 +2571,8 @@ if (BUSES["A2BUS"]~=null) then
MAME_DIR .. "src/devices/bus/a2bus/corvfdc02.h",
MAME_DIR .. "src/devices/bus/a2bus/ezcgi.cpp",
MAME_DIR .. "src/devices/bus/a2bus/ezcgi.h",
MAME_DIR .. "src/devices/bus/a2bus/grafex.cpp",
MAME_DIR .. "src/devices/bus/a2bus/grafex.h",
MAME_DIR .. "src/devices/bus/a2bus/grappler.cpp",
MAME_DIR .. "src/devices/bus/a2bus/grappler.h",
MAME_DIR .. "src/devices/bus/a2bus/lancegs.cpp",

5
src/devices/bus/a2bus/cards.cpp
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@ -42,6 +42,7 @@
#include "bus/a2bus/computereyes2.h"
#include "bus/a2bus/ccs7710.h"
#include "bus/a2bus/ezcgi.h"
#include "bus/a2bus/grafex.h"
#include "bus/a2bus/grappler.h"
#include "bus/a2bus/laser128.h"
#include "bus/a2bus/mouse.h"
@ -136,6 +137,7 @@ void apple2_cards(device_slot_interface &device)
device.option_add("booti", A2BUS_BOOTI); /* Booti Card */
device.option_add("q68", A2BUS_Q68); /* Stellation Q68 68000 card */
device.option_add("q68plus", A2BUS_Q68PLUS); /* Stellation Q68 Plus 68000 card */
device.option_add("grafex", A2BUS_GRAFEX); /* Grafex card (uPD7220 graphics) */
}
void apple2e_cards(device_slot_interface &device)
@ -211,6 +213,7 @@ void apple2e_cards(device_slot_interface &device)
device.option_add("q68", A2BUS_Q68); /* Stellation Q68 68000 card */
device.option_add("q68plus", A2BUS_Q68PLUS); /* Stellation Q68 Plus 68000 card */
device.option_add("a2sd", A2BUS_A2SD); /* Florian Reitz AppleIISD */
device.option_add("grafex", A2BUS_GRAFEX); /* Grafex card (uPD7220 graphics) */
}
void apple2gs_cards(device_slot_interface &device)
@ -280,6 +283,7 @@ void apple2gs_cards(device_slot_interface &device)
device.option_add("lancegs", A2BUS_LANCEGS); /* ///SHH SYSTEME LANceGS Card */
device.option_add("q68", A2BUS_Q68); /* Stellation Q68 68000 card */
device.option_add("q68plus", A2BUS_Q68PLUS); /* Stellation Q68 Plus 68000 card */
device.option_add("grafex", A2BUS_GRAFEX); /* Grafex card (uPD7220 graphics) */
}
void apple3_cards(device_slot_interface &device)
@ -293,4 +297,5 @@ void apple3_cards(device_slot_interface &device)
device.option_add("titan3plus2", A2BUS_TITAN3PLUS2); // Titan /// Plus 2 card
device.option_add("mockingboard", A2BUS_MOCKINGBOARD); // Sweet Micro Systems Mockingboard (experimental on ///)
device.option_add("softcard3", A2BUS_SOFTCARD3); // Microsoft SoftCard ///
device.option_add("grafex", A2BUS_GRAFEX); /* Grafex card (uPD7220 graphics) */
}

134
src/devices/bus/a2bus/grafex.cpp Normal file
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@ -0,0 +1,134 @@
// license:BSD-3-Clause
// copyright-holders:R. Belmont, Rob Justice
/*********************************************************************
grafex.cpp
Implementation of the Grafex-32 card
This was a graphics board using the upd7220 for the Apple II by Ray Dahlby (RDE - Ray Dahlby Electronics)
Instructions on how to build this were described in Radio Electronics magazine in 1986
Febuary, March & April editions.
http://mirrors.apple2.org.za/ftp.apple.asimov.net/documentation/hardware/video/Grafex-32_from_Radio_Electronics_1986.pdf
This version has 128k ram emulated. The original had 32k with provision to accept 128k
A0 selects between the 7220 gdc registers
A1 switches AppleII video or Grafex video (not implemented)
Manual:
https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Interface%20Cards/Video/RDE%20Grafex/Manuals/RDE%20Grafex%20-%20Manual.pdf
The software described in the manual does not look like its available anywhere.
TODO:
Support for multiple cards, each card supported 1 bit of color. The article describes using
three cards to get 8 color RGB output. Each plane is driven directly by its dedicated 7220.
*********************************************************************/
#include "emu.h"
#include "grafex.h"
#include "screen.h"
//**************************************************************************
// TYPE DEFINITIONS
//**************************************************************************
class a2bus_grafex_device : public device_t,
public device_a2bus_card_interface
{
public:
// construction/destruction
a2bus_grafex_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock);
protected:
a2bus_grafex_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock);
virtual void device_start() override;
virtual void device_add_mconfig(machine_config &config) override;
// overrides of standard a2bus slot functions
virtual uint8_t read_c0nx(uint8_t offset) override;
virtual void write_c0nx(uint8_t offset, uint8_t data) override;
private:
required_device<upd7220_device> m_gdc;
required_shared_ptr<uint16_t> m_video_ram;
UPD7220_DISPLAY_PIXELS_MEMBER(hgdc_display_pixels);
void upd7220_map(address_map &map);
rgb_t m_bg, m_fg;
};
//**************************************************************************
// GLOBAL VARIABLES
//**************************************************************************
DEFINE_DEVICE_TYPE(A2BUS_GRAFEX, a2bus_grafex_device, "a2grafex", "Grafex-32")
//-------------------------------------------------
// device_add_mconfig - add device configuration
//-------------------------------------------------
void a2bus_grafex_device::device_add_mconfig(machine_config &config)
{
screen_device &screen(SCREEN(config, "screen", SCREEN_TYPE_RASTER));
screen.set_screen_update("upd7220", FUNC(upd7220_device::screen_update));
screen.set_raw(16_MHz_XTAL, 1024, 384, 640, 262, 62, 200);
UPD7220(config, m_gdc, 2_MHz_XTAL);
m_gdc->set_addrmap(0, &a2bus_grafex_device::upd7220_map);
m_gdc->set_display_pixels(FUNC(a2bus_grafex_device::hgdc_display_pixels));
m_gdc->set_screen("screen");
}
//**************************************************************************
// LIVE DEVICE
//**************************************************************************
a2bus_grafex_device::a2bus_grafex_device(const machine_config &mconfig, const char *tag, device_t *owner, uint32_t clock) :
a2bus_grafex_device(mconfig, A2BUS_GRAFEX, tag, owner, clock)
{
}
a2bus_grafex_device::a2bus_grafex_device(const machine_config &mconfig, device_type type, const char *tag, device_t *owner, uint32_t clock) :
device_t(mconfig, type, tag, owner, clock),
device_a2bus_card_interface(mconfig, *this),
m_gdc(*this, "upd7220"),
m_video_ram(*this, "video_ram")
{
}
void a2bus_grafex_device::device_start()
{
m_bg = rgb_t::black();
m_fg = rgb_t::white();
}
uint8_t a2bus_grafex_device::read_c0nx(uint8_t offset)
{
return m_gdc->read(offset & 0x01);
}
void a2bus_grafex_device::write_c0nx(uint8_t offset, uint8_t data)
{
m_gdc->write(offset & 0x01, data);
}
void a2bus_grafex_device::upd7220_map(address_map &map)
{
map(0x00000, 0x1ffff).ram().share("video_ram");
}
UPD7220_DISPLAY_PIXELS_MEMBER(a2bus_grafex_device::hgdc_display_pixels )
{
uint16_t gfx = m_video_ram[(address & 0x1ffff)];
for (int i=0; i<16; i++)
{
bitmap.pix(y, x + i) = BIT(gfx, i) ? m_fg : m_bg;
}
}

22
src/devices/bus/a2bus/grafex.h Normal file
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@ -0,0 +1,22 @@
// license:BSD-3-Clause
// copyright-holders:R. Belmont, Rob Justice
/*********************************************************************
grafex.h
Implementation of the Grafex-32 card
*********************************************************************/
#ifndef MAME_BUS_A2BUS_A2GRAFEX_H
#define MAME_BUS_A2BUS_A2GRAFEX_H
#pragma once
#include "a2bus.h"
#include "video/upd7220.h"
// device type definition
DECLARE_DEVICE_TYPE(A2BUS_GRAFEX, a2bus_grafex_device)
#endif // MAME_BUS_A2BUS_GRAFEX_H