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lwriter.cpp: Get video output working (#9049)
This commit is contained in:
Jeff Muizelaar
GitHub
parent
21c974e676
commit
c62e85f5fa
@ -97,7 +97,13 @@
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#include "cpu/m68000/m68000.h"
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#include "machine/6522via.h"
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#include "machine/z80scc.h"
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#include "screen.h"
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#define LOG_GENERAL (1U << 0)
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#define LOG_VIDEO (1U << 1)
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//#define VERBOSE (LOG_COMMAND)
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#include "logmacro.h"
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namespace {
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@ -114,6 +120,8 @@ public:
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, m_maincpu(*this, "maincpu")
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, m_scc(*this, "scc")
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, m_via(*this, "via")
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, m_screen(*this, "screen")
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, m_vram_offset(0)
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, m_dsw1(*this, "DSW1")
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, m_dram_ptr(*this, "dram")
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, m_sram_ptr(*this, "sram")
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@ -127,6 +135,9 @@ public:
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, m_print_result(0)
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, m_sbsy(0)
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, m_cbsy(0)
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, m_vsync(0)
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, m_fifo_count(0)
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, m_pb6_tick_count(0)
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{ }
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void lwriter(machine_config &config);
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@ -155,12 +166,18 @@ private:
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DECLARE_WRITE_LINE_MEMBER(via_cb1_w);
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DECLARE_WRITE_LINE_MEMBER(via_cb2_w);
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DECLARE_WRITE_LINE_MEMBER(via_int_w);
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emu_timer *m_pb6_timer;
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TIMER_CALLBACK_MEMBER(pb6_tick);
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uint32_t screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect);
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//DECLARE_WRITE_LINE_MEMBER(scc_int);
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void maincpu_map(address_map &map);
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required_device<cpu_device> m_maincpu;
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required_device<scc8530_device> m_scc;
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required_device<via6522_device> m_via;
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optional_device<screen_device> m_screen;
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std::unique_ptr<u8[]> m_vram;
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size_t m_vram_offset;
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required_ioport m_dsw1;
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required_shared_ptr<uint16_t> m_dram_ptr;
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@ -174,6 +191,11 @@ private:
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int m_print_result;
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bool m_sbsy;
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bool m_cbsy;
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bool m_vsync;;
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int m_fifo_count;
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int m_pb6_tick_count;
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int m_vbl_count;
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int m_reset_count;
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};
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/*
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@ -277,11 +299,15 @@ static INPUT_PORTS_START( lwriter )
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PORT_DIPSETTING( 0x60, "AppleTalk")
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INPUT_PORTS_END
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// 300 dots/inch: 1,863,813 Hz (from the CX manual) / (8 bits per byte) / (48 bytes written per interrupt / 24 ticks per interrupt) = ~116488.3
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#define PB6_CLK 116488
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/* Start it up */
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void lwriter_state::machine_start()
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{
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// do stuff here later on like setting up printer mechanisms HLE timers etc
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m_pb6_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(lwriter_state::pb6_tick),this));
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m_pb6_timer->adjust(attotime::from_hz(PB6_CLK));
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// Initialize ca1 to 1 so that we don't miss the first interrupt/transition to 0
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m_via->write_ca1(1);
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}
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@ -358,20 +384,54 @@ void lwriter_state::eeprom_w(offs_t offset, uint8_t data, uint8_t mem_mask)
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logerror("eeprom_w! %x %x %x\n", offset, data, mem_mask);
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}
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TIMER_CALLBACK_MEMBER(lwriter_state::pb6_tick)
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{
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m_pb6_tick_count += 1;
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m_via->write_pb6(0);
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m_via->write_pb6(1);
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m_pb6_timer->adjust(attotime::from_hz(PB6_CLK));
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}
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/* 4 diagnostic LEDs, plus 4 i/o lines for the printer */
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/* 0 - print cbsy
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* 1 - print prnt
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* 2 - print vsync
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* 3 - print cprdy
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* 4 - led 1
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* 5 - led 2
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* 6 - led 3
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* 7 - led 4
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*/
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void lwriter_state::led_out_w(uint8_t data)
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{
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//popmessage("LED status: %02X\n", data&0xFF);
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logerror("LED status: %02X\n", data&0xFF);
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m_cbsy = data & 1;
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if (!m_vsync && (data & 4)) { // vsync
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LOGMASKED(LOG_VIDEO, "vsync\n");
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m_vbl_count = 0;
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}
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m_vsync = (data & 4);
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popmessage("LED status: %x %x %x %x %x %x %x %x\n", data&0x80, data&0x40, data&0x20, data&0x10, data&0x8, data&0x4, data&0x2, data&0x1);
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}
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// A guess based on not very much
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#define FB_HEIGHT 3434
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#define FB_WIDTH 2520
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/* FIFO to printer, 64 bytes long */
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void lwriter_state::fifo_out_w(uint8_t data)
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{
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/** TODO: actually emulate this */
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logerror("FIFO written with: %02X\n", data&0xFF);
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m_fifo_count += 8;
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if (m_vbl_count >= FB_HEIGHT) {
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m_vbl_count = 0;
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}
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m_vram[m_vbl_count * FB_WIDTH/8 + m_vram_offset] = data;
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m_vram_offset++;
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if (m_vram_offset > (FB_WIDTH*FB_HEIGHT/8)) {
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LOGMASKED(LOG_VIDEO, "vram reset\n");
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m_vram_offset = 0;
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}
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}
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/* via port a bits */
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/* 0 - ?
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@ -416,10 +476,10 @@ WRITE_LINE_MEMBER(lwriter_state::via_ca2_w)
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* 1 - print rdy
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* 2 - print pprdy
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* 3 - overlay
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* 4 -
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* 5 -
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* 6 - timer 2 clk
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* 7 - print related timing thing
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* 4 - scc w/req
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* 5 - resetfifo
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* 6 - timer 2 clk (mroclk)
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* 7 - vbl
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*/
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uint8_t lwriter_state::via_pb_r()
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{
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@ -436,6 +496,16 @@ uint8_t lwriter_state::via_pb_lw2nt_r()
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void lwriter_state::via_pb_w(uint8_t data)
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{
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if ((data & 0x20) && ((m_via_pb & 0x20) == 0)) {
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m_reset_count++;
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LOGMASKED(LOG_VIDEO, "reset fifo %d pb6 %d\n", m_fifo_count, m_pb6_tick_count);
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}
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if ((data & 0x80) && ((m_via_pb & 0x80) == 0)) {
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m_vbl_count++;
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LOGMASKED(LOG_VIDEO, "vbl fifo:%d vbl:%d vram_off: %ld\n", m_fifo_count, m_vbl_count, m_vram_offset);
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m_vram_offset = 0;
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}
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logerror(" VIA: Port B written with data of 0x%02x!\n", data);
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/* Like early Mac models which had VIA A4 control overlaying, the
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* LaserWriter II NT overlay is controlled by VIA B3 */
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@ -471,7 +541,6 @@ WRITE_LINE_MEMBER(lwriter_state::scc_int)
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#define CPU_CLK (22.321_MHz_XTAL / 2) // Based on pictures form here: http://picclick.co.uk/Apple-Postscript-LaserWriter-IINT-Printer-640-4105-M6009-Mainboard-282160713108.html#&gid=1&pid=7
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#define RXC_CLK ((CPU_CLK.value() - (87 * 16 * 70)) / 3) // Tuned to get 9600 baud according to manual, needs rework based on real hardware
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/* These are from LBP-CX Series Video Interface Manual:
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* http://beefchicken.com/retro/laserwriter/LBP-CX%20Series%20Video%20Interface%20Service%20Manual.pdf
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*/
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@ -548,6 +617,27 @@ void lwriter_state::write_dtr(int state)
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}
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}
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uint32_t lwriter_state::screen_update(screen_device &screen, bitmap_rgb32 &bitmap, const rectangle &cliprect)
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{
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for (int y = 0; y < FB_HEIGHT; y++) {
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for (int x = 0; x < FB_WIDTH; x += 8) {
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uint32_t *scanline = &bitmap.pix(y, x);
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uint8_t pixels = m_vram[y * FB_WIDTH/8 + x/8];
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#define f(x) ((x) ? (0) : (0xffffffff))
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*scanline++ = f(pixels&0x80);
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*scanline++ = f((pixels<<1)&0x80);
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*scanline++ = f((pixels<<2)&0x80);
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*scanline++ = f((pixels<<3)&0x80);
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*scanline++ = f((pixels<<4)&0x80);
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*scanline++ = f((pixels<<5)&0x80);
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*scanline++ = f((pixels<<6)&0x80);
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*scanline++ = f((pixels<<7)&0x80);
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}
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}
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return 0;
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}
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void lwriter_state::lwriter2nt(machine_config &config)
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{
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lwriter(config);
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@ -560,6 +650,13 @@ void lwriter_state::lwriter(machine_config &config)
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M68000(config, m_maincpu, CPU_CLK);
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m_maincpu->set_addrmap(AS_PROGRAM, &lwriter_state::maincpu_map);
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SCREEN(config, m_screen, SCREEN_TYPE_LCD);
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m_screen->set_refresh_hz(30);
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m_screen->set_size(FB_WIDTH, FB_HEIGHT);
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m_screen->set_visarea_full();
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m_screen->set_screen_update(FUNC(lwriter_state::screen_update));
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m_vram = make_unique_clear<uint8_t[]>(FB_WIDTH*FB_HEIGHT/8);
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SCC8530N(config, m_scc, CPU_CLK);
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m_scc->configure_channels(RXC_CLK, 0, RXC_CLK, 0);
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/* Port A */
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