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https://github.com/holub/mame
synced 2025-04-23 08:49:55 +03:00
smc777.cpp: documentation overhaul, WIP (nw)
This commit is contained in:
angelosa
parent
428e48c1b1
commit
a93943e002
@ -5,10 +5,10 @@
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SMC-777 (c) 1983 Sony
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driver by Angelo Salese
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TODO:
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- no real documentation, the entire driver is just a bunch of educated
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guesses ...
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- Implement SMC-70 specific features;
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- Implement GFX modes other than 160x100x4
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- ROM/RAM bankswitch, it apparently happens after one instruction prefetching.
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We currently use an hackish implementation until the MAME/MESS framework can
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support that ...
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@ -89,16 +89,17 @@ private:
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DECLARE_READ8_MEMBER(key_r);
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DECLARE_WRITE8_MEMBER(key_w);
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DECLARE_WRITE8_MEMBER(border_col_w);
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DECLARE_READ8_MEMBER(system_input_r);
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DECLARE_WRITE8_MEMBER(system_output_w);
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DECLARE_READ8_MEMBER(io_status_1c_r);
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DECLARE_READ8_MEMBER(io_status_1d_r);
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DECLARE_WRITE8_MEMBER(io_control_w);
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DECLARE_WRITE8_MEMBER(color_mode_w);
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DECLARE_WRITE8_MEMBER(ramdac_w);
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DECLARE_READ8_MEMBER(display_reg_r);
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DECLARE_WRITE8_MEMBER(display_reg_w);
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DECLARE_READ8_MEMBER(gcw_r);
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DECLARE_WRITE8_MEMBER(gcw_w);
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DECLARE_READ8_MEMBER(smc777_mem_r);
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DECLARE_WRITE8_MEMBER(smc777_mem_w);
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DECLARE_READ8_MEMBER(irq_mask_r);
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DECLARE_WRITE8_MEMBER(irq_mask_w);
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DECLARE_READ8_MEMBER(vsync_irq_status_r);
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DECLARE_WRITE8_MEMBER(vsync_irq_enable_w);
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void smc777_palette(palette_device &palette) const;
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uint32_t screen_update_smc777(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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INTERRUPT_GEN_MEMBER(vblank_irq);
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@ -106,8 +107,8 @@ private:
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DECLARE_READ8_MEMBER(fdc_r);
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DECLARE_WRITE8_MEMBER(fdc_w);
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DECLARE_READ8_MEMBER(fdc_request_r);
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DECLARE_WRITE8_MEMBER(floppy_select_w);
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DECLARE_READ8_MEMBER(fdc1_fast_status_r);
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DECLARE_WRITE8_MEMBER(fdc1_select_w);
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DECLARE_WRITE_LINE_MEMBER(fdc_intrq_w);
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DECLARE_WRITE_LINE_MEMBER(fdc_drq_w);
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@ -144,11 +145,12 @@ private:
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struct { uint8_t r,g,b; } m_pal;
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uint8_t m_raminh,m_raminh_pending_change; //bankswitch
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uint8_t m_raminh_prefetch;
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uint8_t m_irq_mask;
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uint8_t m_pal_mode;
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uint8_t m_keyb_cmd;
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uint8_t m_crtc_vreg[0x20];
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uint8_t m_crtc_addr;
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bool m_vsync_idf;
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bool m_vsync_ief;
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};
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@ -456,26 +458,25 @@ WRITE8_MEMBER( smc777_state::fdc_w )
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m_fdc->write(offset, data ^ 0xff);
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}
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READ8_MEMBER( smc777_state::fdc_request_r )
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READ8_MEMBER( smc777_state::fdc1_fast_status_r )
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{
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uint8_t data = 0;
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// TODO: inverted wrt documentation?
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data |= !m_fdc_drq_flag << 6;
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data |= m_fdc_irq_flag << 7;
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return data;
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}
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WRITE8_MEMBER( smc777_state::floppy_select_w )
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WRITE8_MEMBER( smc777_state::fdc1_select_w )
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{
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floppy_image_device *floppy = nullptr;
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// ---- xxxx select floppy drive (yes, 15 of them, A to P)
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switch (data & 0x01)
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{
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case 0: floppy = m_floppy0->get_device(); break;
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case 1: floppy = m_floppy1->get_device(); break;
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}
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// x--- ---- SIDE1: [SMC-70] side select
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// ---- --x- EXDS: [SMC-70] external drive select (0=internal, 1=external)
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// ---- ---x DS01: select floppy drive
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floppy = (data & 1 ? m_floppy1 : m_floppy0)->get_device();
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m_fdc->set_floppy(floppy);
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@ -547,36 +548,59 @@ WRITE8_MEMBER(smc777_state::border_col_w)
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}
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READ8_MEMBER(smc777_state::system_input_r)
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READ8_MEMBER(smc777_state::io_status_1c_r)
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{
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printf("System FF R %02x\n",m_system_data & 0x0f);
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/*
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* RES x--- ---- Power On bit (1=reset switch)
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* HiZ -x-- ---- [SMC-70] no drive (always '1'?)
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* LPH --x- ---- [SMC-70] light pen H position
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* CP ---x ---- [SMC-777] color board (active low)
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* LPV ---x x--- [SMC-70] light pen V position
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* ID ---- -x-- 0=SMC-777 1=SMC-70
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* MD ---- --xx [SMC-70] boot mode (00=DISK; 10=ROM; 11=EXT)
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*/
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printf("System R\n");
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switch(m_system_data & 0x0f)
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{
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case 0x00:
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return ((m_raminh & 1) << 4); //unknown bit, Dragon's Alphabet and Bird Crush relies on this for correct colors
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}
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return 0;
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}
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return m_system_data;
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READ8_MEMBER(smc777_state::io_status_1d_r)
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{
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/*
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* TCIN x--- ---- CMT read data
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* HiZ -x-- ---- [SMC-70] no drive (always '1'?)
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* LPIN --x- ---- [SMC-70] light pen input
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* PR_BUSY ---x ---- printer busy
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* PR_ACK ---- x--- printer ACK
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* ID ---- -x-- 0=SMC-777 1=SMC-70
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* MD ---- --xx [SMC-70] boot mode (00=DISK; 10=ROM; 11=EXT)
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*/
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return 0;
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}
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WRITE8_MEMBER(smc777_state::system_output_w)
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WRITE8_MEMBER(smc777_state::io_control_w)
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{
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/*
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---x 0000 ram inibit signal
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---x 1001 beep
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all the rest is unknown at current time
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*/
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* flip-flop based
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* ---x -111 cassette write
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* ---x -110 printer strobe
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* ---x -101 beeper
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* ---x -100 cassette start (MONITOR_ON_OFF)
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* ---x -011 0=RGB 1=Component
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* ---x -010 0=525 lines 1=625 lines (NTSC/PAL switch?)
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* ---x -001 1=display disable
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* ---x -000 ram inibit signal
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*/
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m_system_data = data;
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switch(m_system_data & 0x0f)
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switch(m_system_data & 0x07)
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{
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case 0x00:
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// "ROM / RAM register change is done at the beginning of the next M1 cycle"
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m_raminh_pending_change = ((data & 0x10) >> 4) ^ 1;
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m_raminh_prefetch = (uint8_t)(m_maincpu->state_int(Z80_R)) & 0x7f;
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break;
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case 0x02: printf("Interlace %s\n",data & 0x10 ? "on" : "off"); break;
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case 0x02: printf("Screen line number %d\n",data & 0x10 ? 625 : 525); break;
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case 0x05: m_beeper->set_state(data & 0x10); break;
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default: printf("System FF W %02x\n",data); break;
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}
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@ -584,7 +608,14 @@ WRITE8_MEMBER(smc777_state::system_output_w)
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WRITE8_MEMBER(smc777_state::color_mode_w)
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{
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switch(data & 0x0f)
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/*
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* ---x -111 gfx palette select
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* ---x -110 text palette select
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* ---x -101 joy 2 out
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* ...
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* ---x -000 joy 2 out
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*/
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switch(data & 0x07)
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{
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case 0x06: m_pal_mode = (data & 0x10) ^ 0x10; break;
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default: printf("Color FF %02x\n",data); break;
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@ -608,18 +639,29 @@ WRITE8_MEMBER(smc777_state::ramdac_w)
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}
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}
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READ8_MEMBER(smc777_state::display_reg_r)
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READ8_MEMBER(smc777_state::gcw_r)
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{
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return m_display_reg;
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}
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/* x */
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WRITE8_MEMBER(smc777_state::display_reg_w)
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WRITE8_MEMBER(smc777_state::gcw_w)
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{
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/*
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x--- ---- width 80 / 40 switch (0 = 640 x 200 1 = 320 x 200)
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---- -x-- mode select?
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*/
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* x--- ---- text mode (0 = 80x25 1 = 40x25)
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* -x-- ---- text page (in 40x25 mode)
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* --x- ---- color mode (1=for 2bpp mode, blue is replaced with white)
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* ---x ---- [SMC-70] interlace
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* ---- xxyy gfx mode (model dependant)
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* [SMC-70]
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* ---- 11-- 640x400x1 bpp
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* ---- 10-- 640x200x2 bpp
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* ---- 01-- 320x200x4 bpp
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* ---- 00yy 160x100x4 bpp, bits 0-1 selects page
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* [SMC-777]
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* ---- 1--- 640x200x2 bpp
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* ---- 0--- 320x200x4 bpp
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*/
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m_display_reg = data;
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}
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@ -628,7 +670,8 @@ READ8_MEMBER(smc777_state::smc777_mem_r)
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{
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uint8_t z80_r;
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if(m_raminh_prefetch != 0xff) //do the bankswitch AFTER that the prefetch instruction is executed (FIXME: this is an hackish implementation)
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// TODO: do the bankswitch AFTER that the prefetch instruction is executed (hackish implementation)
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if(m_raminh_prefetch != 0xff)
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{
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z80_r = (uint8_t)m_maincpu->state_int(Z80_R);
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@ -650,17 +693,25 @@ WRITE8_MEMBER(smc777_state::smc777_mem_w)
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m_work_ram[offset] = data;
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}
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READ8_MEMBER(smc777_state::irq_mask_r)
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READ8_MEMBER(smc777_state::vsync_irq_status_r)
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{
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return m_irq_mask;
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if (m_vsync_idf == true)
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{
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m_vsync_idf = false;
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return 1;
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}
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return 0;
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}
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WRITE8_MEMBER(smc777_state::irq_mask_w)
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WRITE8_MEMBER(smc777_state::vsync_irq_enable_w)
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{
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if(data & 0xfe)
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printf("Irq mask = %02x\n",data & 0xfe);
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logerror("Irq mask = %02x\n",data & 0xfe);
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m_irq_mask = data & 1;
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// IRQ mask
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m_vsync_ief = BIT(data,0);
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// TODO: clear idf on 1->0 irq mask transition?
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}
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void smc777_state::smc777_mem(address_map &map)
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@ -677,34 +728,40 @@ void smc777_state::smc777_io(address_map &map)
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map(0x10, 0x17).select(0xff00).rw(FUNC(smc777_state::pcg_r), FUNC(smc777_state::pcg_w));
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map(0x18, 0x19).mirror(0xff00).w(FUNC(smc777_state::mc6845_w));
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map(0x1a, 0x1b).mirror(0xff00).rw(FUNC(smc777_state::key_r), FUNC(smc777_state::key_w));
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map(0x1c, 0x1c).mirror(0xff00).rw(FUNC(smc777_state::system_input_r), FUNC(smc777_state::system_output_w));
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// AM_RANGE(0x1d, 0x1d) system and control read, printer strobe write
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// AM_RANGE(0x1e, 0x1f) rs232 irq control
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map(0x20, 0x20).mirror(0xff00).rw(FUNC(smc777_state::display_reg_r), FUNC(smc777_state::display_reg_w));
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map(0x21, 0x21).mirror(0xff00).rw(FUNC(smc777_state::irq_mask_r), FUNC(smc777_state::irq_mask_w));
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// AM_RANGE(0x22, 0x22) printer output data
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map(0x1c, 0x1c).mirror(0xff00).rw(FUNC(smc777_state::io_status_1c_r), FUNC(smc777_state::io_control_w));
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map(0x1d, 0x1d).mirror(0xff00).rw(FUNC(smc777_state::io_status_1d_r), FUNC(smc777_state::io_control_w));
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// map(0x1e, 0x1f) rs232 irq control
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map(0x20, 0x20).mirror(0xff00).rw(FUNC(smc777_state::gcw_r), FUNC(smc777_state::gcw_w));
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map(0x21, 0x21).mirror(0xff00).rw(FUNC(smc777_state::vsync_irq_status_r), FUNC(smc777_state::vsync_irq_enable_w));
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// map(0x22, 0x22) printer output data
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map(0x23, 0x23).mirror(0xff00).w(FUNC(smc777_state::border_col_w));
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// AM_RANGE(0x24, 0x24) rtc write address
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// AM_RANGE(0x25, 0x25) rtc read
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// AM_RANGE(0x26, 0x26) rs232 #1
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// AM_RANGE(0x28, 0x2c) fdc #2
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// AM_RANGE(0x2d, 0x2f) rs232 #2
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// map(0x24, 0x24) rtc write address (M5M58321RS)
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// map(0x25, 0x25) rtc read
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// map(0x26, 0x26) rs232 #1
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// map(0x28, 0x2c) fdc #2 (8")
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// map(0x2d, 0x2f) rs232 #2
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map(0x30, 0x33).mirror(0xff00).rw(FUNC(smc777_state::fdc_r), FUNC(smc777_state::fdc_w));
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map(0x34, 0x34).mirror(0xff00).rw(FUNC(smc777_state::fdc_request_r), FUNC(smc777_state::floppy_select_w));
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// AM_RANGE(0x35, 0x37) rs232 #3
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// AM_RANGE(0x38, 0x3b) cache disk unit
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// AM_RANGE(0x3c, 0x3d) rgb superimposer
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// AM_RANGE(0x40, 0x47) ieee-488
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// AM_RANGE(0x48, 0x4f) hdd (winchester)
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map(0x34, 0x34).mirror(0xff00).rw(FUNC(smc777_state::fdc1_fast_status_r), FUNC(smc777_state::fdc1_select_w));
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// map(0x35, 0x37) rs232 #3
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// map(0x38, 0x3b) cache disk unit
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// 0x38 (R) CDSTS status port (W) CDCMD command port
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// 0x39 (W) track register
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// 0x3a (W) sector register
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// 0x3b (RW) data port
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// map(0x3c, 0x3d) rgb superimposer / genlock control
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// map(0x40, 0x47) ieee-488 / TMS9914A I/F
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map(0x44, 0x44).mirror(0xff00).portr("GPDSW"); // normally unmapped in GPIB interface
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// map(0x48, 0x49) hdd (winchester)
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// TODO: address bit 8 selects joy port 2
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map(0x51, 0x51).mirror(0xff00).portr("JOY_1P").w(FUNC(smc777_state::color_mode_w));
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map(0x52, 0x52).select(0xff00).w(FUNC(smc777_state::ramdac_w));
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map(0x53, 0x53).mirror(0xff00).w("sn1", FUNC(sn76489a_device::command_w));
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// AM_RANGE(0x54, 0x59) vrt controller
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// AM_RANGE(0x5a, 0x5b) ram banking
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// AM_RANGE(0x70, 0x70) auto-start rom
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// AM_RANGE(0x74, 0x74) ieee-488 rom
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// AM_RANGE(0x75, 0x75) vrt controller rom
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// AM_RANGE(0x7e, 0x7f) kanji rom
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// map(0x54, 0x59) vrt controller
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// map(0x5a, 0x5b) ram banking
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// map(0x70, 0x70) auto-start ROM (ext-ROM)
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// map(0x74, 0x74) ieee-488 GPIB ROM port
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// map(0x75, 0x75) vrt controller ROM
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// map(0x7e, 0x7f) kanji ROM
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map(0x80, 0xff).select(0xff00).rw(FUNC(smc777_state::fbuf_r), FUNC(smc777_state::fbuf_w));
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}
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@ -841,6 +898,32 @@ static INPUT_PORTS_START( smc777 )
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PORT_BIT( 0x20, IP_ACTIVE_LOW, IPT_UNUSED )
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PORT_BIT( 0x40, IP_ACTIVE_LOW, IPT_UNUSED )
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PORT_BIT( 0x80, IP_ACTIVE_HIGH,IPT_UNKNOWN ) //status?
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PORT_START("GPDSW")
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PORT_DIPNAME( 0x01, 0x00, "GPDSW" )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x01, DEF_STR( On ) )
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PORT_DIPNAME( 0x02, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x02, DEF_STR( On ) )
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PORT_DIPNAME( 0x04, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x04, DEF_STR( On ) )
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PORT_DIPNAME( 0x08, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x08, DEF_STR( On ) )
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PORT_DIPNAME( 0x10, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x10, DEF_STR( On ) )
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PORT_DIPNAME( 0x20, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x20, DEF_STR( On ) )
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PORT_DIPNAME( 0x40, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x40, DEF_STR( On ) )
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PORT_DIPNAME( 0x80, 0x00, DEF_STR( Unknown ) )
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PORT_DIPSETTING( 0x00, DEF_STR( Off ) )
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PORT_DIPSETTING( 0x80, DEF_STR( On ) )
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INPUT_PORTS_END
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||||
|
||||
/*
|
||||
@ -988,6 +1071,7 @@ void smc777_state::machine_reset()
|
||||
m_raminh_pending_change = 1;
|
||||
m_raminh_prefetch = 0xff;
|
||||
m_pal_mode = 0x10;
|
||||
m_vsync_idf = false;
|
||||
|
||||
m_beeper->set_state(0);
|
||||
}
|
||||
@ -1010,8 +1094,11 @@ void smc777_state::smc777_palette(palette_device &palette) const
|
||||
|
||||
INTERRUPT_GEN_MEMBER(smc777_state::vblank_irq)
|
||||
{
|
||||
if(m_irq_mask)
|
||||
if(m_vsync_ief)
|
||||
{
|
||||
device.execute().set_input_line(0,HOLD_LINE);
|
||||
m_vsync_idf = true;
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user