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(MESS) cat.c (Canon cat): Added the 6ms timer and its counter. [Lord Nightmare]
This commit is contained in:
Jonathan Gevaryahu
parent
f5fd9d53b0
commit
37a5f22673
@ -41,16 +41,13 @@ X3: 2.4576Mhz, used by the modem chip AMI S35213 at IC37
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ToDo:
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* Canon Cat
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- Find the mirrors for the write-only video control register and figure out
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what the writes actually do
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what the writes actually do; hook these up properly to screen timing etc
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- The 2.40 (bios 0) firmware gets annoyed and thinks it has a phone call at
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random.
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(hit ctrl a few times to make it shut up for a bit or go into forth mode);
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The 1.74 (bios 1) firmware doesn't have this issue.
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Figure out what causes it and make it stop.
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(This MIGHT be related to the mysterious HK0NT line connecting gate array 2
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to a toggle latch connecting to IP2 on the DUART; It may be necessary to
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actually probe that line with a meter to see what address/bit causes it to
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toggle, if the call can't be found in the cat source code)
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Figure out what causes it and make it stop. May be OFFHOOK or more likely
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the DUART thinks the phone is ringing constantly.
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- Floppy drive (3.5", Single Sided Double Density MFM, ~400kb)
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* Cat has very low level control of data being read or written, much like
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the Amiga does
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@ -71,9 +68,14 @@ ToDo:
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- Centronics port
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- RS232C port and Modem "port" connected to the DUART's two ports
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- DTMF generator chip (connected to DUART 'user output' pins OP4,5,6,7)
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- 6ms timer at 0x83xxxx
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- Hook duart IP2 up to the 6ms timer
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- Correctly hook the duart interrupt to the 68k, including autovector using the vector register on the duart
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- Watchdog timer/powerfail at 0x85xxxx
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- Canon Cat released versions known: 1.74 (dumped), 2.40 (dumped), 2.42 (NEED DUMP)
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- Known Spellcheck roms: NH7-0684 (US, dumped); NH7-0724 (UK, NEED DUMP);
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NH7-0813/0814 (Quebec/France, NEED DUMP); NH7-1019/1020/1021 (Germany, NEED DUMP)
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It is possible the non-US roms were never officially released.
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Wordlist sources: American Heritage (US and UK), Librarie Larousse (FR), Langenscheidt (DE)
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* Swyft
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- Figure out the keyboard (interrupts are involved? or maybe an NMI on a
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@ -87,7 +89,7 @@ ToDo:
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// Defines
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#undef DEBUG_VIDEO_STATUS_W
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#undef DEBUG_VIDEO_ENABLE_W
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#undef DEBUG_VIDEO_CONTROL_W
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#undef DEBUG_FLOPPY_CONTROL_W
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@ -121,10 +123,10 @@ public:
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cat_state(const machine_config &mconfig, device_type type, const char *tag)
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: driver_device(mconfig, type, tag),
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m_maincpu(*this, "maincpu"),
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//m_nvram(*this, "nvram"), // merge with p_sram?
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//m_nvram(*this, "nvram"), // merge with svram?
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//m_duart(*this, "duart68681"),
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//m_speaker(*this, "speaker"),
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m_p_sram(*this, "p_sram"), // nvram
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m_svram(*this, "svram"), // nvram
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m_p_videoram(*this, "p_videoram"),
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m_y0(*this, "Y0"),
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m_y1(*this, "Y1"),
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@ -141,7 +143,7 @@ public:
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//optional_device<nvram_device> m_nvram;
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//required_device<68681_device> m_duart;
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//required_device<speaker_sound_device> m_speaker;
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optional_shared_ptr<UINT16> m_p_sram;
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optional_shared_ptr<UINT16> m_svram;
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required_shared_ptr<UINT16> m_p_videoram;
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optional_ioport m_y0;
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optional_ioport m_y1;
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@ -153,6 +155,7 @@ public:
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optional_ioport m_y7;
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optional_ioport m_dipsw;
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emu_timer *m_keyboard_timer;
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emu_timer *m_6ms_timer;
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DECLARE_MACHINE_START(cat);
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DECLARE_MACHINE_RESET(cat);
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@ -165,10 +168,6 @@ public:
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UINT32 screen_update_cat(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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UINT32 screen_update_swyft(screen_device &screen, bitmap_ind16 &bitmap, const rectangle &cliprect);
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DECLARE_WRITE16_MEMBER(cat_video_status_w);
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DECLARE_WRITE16_MEMBER(cat_test_mode_w);
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DECLARE_READ16_MEMBER(cat_s35213_r);
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DECLARE_WRITE16_MEMBER(cat_s35213_w);
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DECLARE_READ16_MEMBER(cat_floppy_control_r);
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DECLARE_WRITE16_MEMBER(cat_floppy_control_w);
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DECLARE_WRITE16_MEMBER(cat_printer_data_w);
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@ -180,16 +179,30 @@ public:
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DECLARE_READ16_MEMBER(cat_floppy_status_r);
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DECLARE_READ16_MEMBER(cat_battery_r);
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DECLARE_WRITE16_MEMBER(cat_printer_control_w);
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DECLARE_READ16_MEMBER(cat_modem_r);
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DECLARE_WRITE16_MEMBER(cat_modem_w);
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DECLARE_READ16_MEMBER(cat_6ms_counter_r);
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DECLARE_WRITE16_MEMBER(cat_video_enable_w);
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DECLARE_WRITE16_MEMBER(cat_test_mode_w);
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DECLARE_READ16_MEMBER(cat_2e80_r);
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DECLARE_READ16_MEMBER(cat_0080_r);
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DECLARE_READ16_MEMBER(cat_0000_r);
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UINT8 m_duart_inp;// = 0x0e;
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/* gate array 2 has a 16-bit counter inside which counts at 10mhz and
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rolls over at FFFF->0000; on rollover (or maybe at FFFF terminal count)
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it triggers the KTOBF output. It does this every 6.5535ms, which causes
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a 74LS74 d-latch at IC100 to switch the state of the DUART IP2 line;
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this causes the DUART to fire an interrupt, which makes the 68000 read
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the keyboard.
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*/
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UINT16 m_6ms_counter;
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UINT8 m_video_enable;
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UINT16 m_pr_cont;
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UINT8 m_keyboard_line;
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TIMER_CALLBACK_MEMBER(keyboard_callback);
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TIMER_CALLBACK_MEMBER(counter_6ms_callback);
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TIMER_CALLBACK_MEMBER(swyft_reset);
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};
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@ -211,30 +224,6 @@ DRIVER_INIT_MEMBER( cat_state,cat )
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}
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}*/
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WRITE16_MEMBER( cat_state::cat_test_mode_w )
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{
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#ifdef DEBUG_TEST_W
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fprintf(stderr, "Test mode reg write: offset %06X, data %04X\n", 0x860000+(offset<<1), data);
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#endif
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}
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// AMI S35213 300/1200 Single Chip Modem (datasheet found at http://bitsavers.trailing-edge.com/pdf/ami/_dataBooks/1985_AMI_MOS_Products_Catalog.pdf on pdf page 243)
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READ16_MEMBER( cat_state::cat_s35213_r )
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{
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#ifdef DEBUG_MODEM_R
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fprintf(stderr,"Read from s35213 modem address %06X\n", 0x820000+(offset<<1));
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#endif
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// HACK: return default 'sane' modem state
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return 0x00;
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}
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WRITE16_MEMBER( cat_state::cat_s35213_w )
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{
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#ifdef DEBUG_MODEM_W
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fprintf(stderr,"Write to s35213 modem address %06X, data %04X\n", 0x820000+(offset<<1), data);
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#endif
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}
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/* 0x600000-0x65ffff Write: Video Generator (AKA NH4-5001 AKA Gate Array #1 @ IC30)
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writing to the video generator is done by putting the register number in the high 3 bits
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and the data to write in the lower 12 (14?) bits.
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@ -334,7 +323,6 @@ WRITE16_MEMBER( cat_state::cat_floppy_data_w )
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#endif
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}
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// 0x800008-0x800009: Floppy status register (called fd.status in the cat source code)
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/* FEDCBA98 (76543210 is ignored)
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* |||||||\-- ? always low
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@ -343,10 +331,9 @@ WRITE16_MEMBER( cat_state::cat_floppy_data_w )
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* ||||\----- /WRITE PROTECT: 1 = writable, 0 = protected (verified)
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* |||\------ /TRACK0: 0 = on track 0, 1 = not on track 0 (verified)
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* ||\------- /INDEX: 0 = index sensor active, 1 = index sensor inactive (verified)
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* |\-------- ? low on drive 1, high on drive 0?
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* \--------- ? usually high but occasionally low?
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stuff that needs to be found here:
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ready sense
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* |\-------- ? this bit may indicate which drive is selected, i.e. same as floppy control bit 7; low on drive 1, high on drive 0?
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* \--------- ? this bit may indicate 'data separator overflow'; it is usually low but becomes high if you manually select the floppy drive
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ALL of these bits except bit 7 seem to be reset when the selected drive in floppy control is switched
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*/
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READ16_MEMBER( cat_state::cat_floppy_status_r )
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{
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@ -415,26 +402,58 @@ WRITE16_MEMBER( cat_state::cat_printer_control_w )
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m_pr_cont = data;
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}
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WRITE16_MEMBER( cat_state::cat_video_status_w )
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// 0x820000: AMI S35213 300/1200 Single Chip Modem (datasheet found at http://bitsavers.trailing-edge.com/pdf/ami/_dataBooks/1985_AMI_MOS_Products_Catalog.pdf on pdf page 243)
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READ16_MEMBER( cat_state::cat_modem_r )
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{
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#ifdef DEBUG_MODEM_R
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fprintf(stderr,"Read from s35213 modem address %06X\n", 0x820000+(offset<<1));
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#endif
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// HACK: return default 'sane' modem state
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return 0x00;
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}
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WRITE16_MEMBER( cat_state::cat_modem_w )
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{
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#ifdef DEBUG_MODEM_W
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fprintf(stderr,"Write to s35213 modem address %06X, data %04X\n", 0x820000+(offset<<1), data);
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#endif
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}
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// 0x830000: 6ms counter (used for KTOBF)
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READ16_MEMBER( cat_state::cat_6ms_counter_r )
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{
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return m_6ms_counter;
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}
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// 0x840000: video enable (also controls hsync/vsync?)
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WRITE16_MEMBER( cat_state::cat_video_enable_w )
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{
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/*
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* 76543210
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* |||||||\-- ?
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* ||||||\--- ?
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* |||||\---- Video enable (1 = video on, 0 = video off/screen black)
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* ||||\----- ? (always written as 1?)
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* |||\------ ? (always written as 1?)
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* ||||\----- ? (always written as 1?) maybe hsync
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* |||\------ ? (always written as 1?) maybe vsync
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* ||\------- ?
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* |\-------- ?
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* \--------- ?
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*/
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#ifdef DEBUG_VIDEO_STATUS_W
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fprintf(stderr, "Video status reg write: offset %06X, data %04X\n", 0x840000+(offset<<1), data);
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#ifdef DEBUG_VIDEO_ENABLE_W
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fprintf(stderr, "Video enable reg write: offset %06X, data %04X\n", 0x840000+(offset<<1), data);
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#endif
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m_video_enable = BIT( data, 2 );
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}
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// 0x850000: test mode registers
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WRITE16_MEMBER( cat_state::cat_test_mode_w )
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{
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#ifdef DEBUG_TEST_W
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fprintf(stderr, "Test mode reg write: offset %06X, data %04X\n", 0x860000+(offset<<1), data);
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#endif
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}
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// open bus etc handlers
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READ16_MEMBER( cat_state::cat_2e80_r )
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{
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@ -455,7 +474,7 @@ READ16_MEMBER( cat_state::cat_0080_r )
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/* Canon cat memory map, based on a 16MB dump of the entire address space of a running unit using forth "1000000 0 do i c@ semit loop"
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68k address map:
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a23 a22 a21 a20 a19 a18 a17 a16 a15 a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a4 a3 a2 a1 (a0 via UDS/LDS)
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0 0 * x x * * * x x x x x x x x x x x x x x x x *GATE ARRAY 2 DECODES THESE LINES TO ENABLE THIS AREA*
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*i *i * x x * * * x x x x x x x x x x x x x x x x *GATE ARRAY 2 DECODES THESE LINES TO ENABLE THIS AREA* (a23 and a22 are indirectly decoded via the /RAMROMCS and /IOCS lines from gate array 1)
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0 0 0 0 x 0 a * * * * * * * * * * * * * * * * b R ROM (ab: 00=ic4 01=ic2 10=ic5 11=ic3) (EPROM 27C512 x 4) [controlled via GA2 /ROMCS]
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0 0 0 0 x 1 0 0 x x * * * * * * * * * * * * * 0 RW SVRAM ic11 d4364 (battery backed) [controlled via GA2 /RAMCS]
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0 0 0 0 x 1 x 1 x x x x x x x x x x x x x x x 0 O OPEN BUS (reads as 0x2e) [may be controlled via GA2 /RAMCS?]
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@ -485,8 +504,8 @@ a23 a22 a21 a20 a19 a18 a17 a16 a15 a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a4
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1 x x x 0 W? Unknown (reads as 0x00)
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1 0 0 x x 0 0 1 x x x x x x x x x x x * * * * 1 RW 68681 DUART at ic34 [controlled via GA2 /DUARTCS]
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1 0 0 x x 0 1 0 x x x x x x x x x x * * * * * 0 RW Modem Chip AMI S35213 @ IC37 DATA BIT 7 ONLY [controlled via GA2 /SMCS]
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1 0 0 x x 0 1 1 x x x x x x x x x x x x x x x * RW Read: Fixed 16-bit counter. increments once per frame? Write: Modem Chip?
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1 0 0 x x 1 0 0 x x x x x x x x x x x x x x x * W? Video Control register? (screen enable on bit 3?) (reads as 0x2e80)
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1 0 0 x x 0 1 1 x x x x x x x x x x x x x x x * R Read: Fixed 16-bit counter from ga2. increments once another 16-bit counter clocked at 10mhz overflows
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1 0 0 x x 1 0 0 x x x x x x x x x x x x x x x * W? Video/Sync enable register? (screen enable on bit 3?) (reads as 0x2e80)
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1 0 0 x x 1 0 1 x x x x x x x x x x x x x x x * R? reads as 0x0100 0x0101 or 0x0102, some sort of test register or video status register?
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1 0 0 x x 1 1 0 x x x x x x x x x x x x x x x * W? Test register? (reads as 0x0000)
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1 0 0 x x 1 1 1 x x x x x x x x x x x x x x x * ? Unknown (reads as 0x2e80)
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@ -499,7 +518,7 @@ a23 a22 a21 a20 a19 a18 a17 a16 a15 a14 a13 a12 a11 a10 a9 a8 a7 a6 a5 a4
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static ADDRESS_MAP_START(cat_mem, AS_PROGRAM, 16, cat_state)
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ADDRESS_MAP_UNMAP_HIGH
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AM_RANGE(0x000000, 0x03ffff) AM_ROM AM_MIRROR(0x080000) // 256 KB ROM
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AM_RANGE(0x040000, 0x043fff) AM_RAM AM_SHARE("p_sram") AM_MIRROR(0x08C000)// SRAM powered by battery
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AM_RANGE(0x040000, 0x043fff) AM_RAM AM_SHARE("svram") AM_MIRROR(0x08C000)// SRAM powered by battery
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AM_RANGE(0x200000, 0x27ffff) AM_ROM AM_REGION("svrom",0x0000) AM_MIRROR(0x180000) // SV ROM
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AM_RANGE(0x400000, 0x47ffff) AM_RAM AM_SHARE("p_videoram") AM_MIRROR(0x180000) // 512 KB RAM
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AM_RANGE(0x600000, 0x67ffff) AM_READWRITE(cat_2e80_r,cat_video_control_w) AM_MIRROR(0x180000) // Gate Array #1: Video
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@ -513,9 +532,9 @@ static ADDRESS_MAP_START(cat_mem, AS_PROGRAM, 16, cat_state)
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AM_RANGE(0x80000e, 0x80000f) AM_READWRITE(cat_battery_r,cat_printer_control_w) AM_MIRROR(0x18FFE0) // Centronics Printer Control, keyboard led and country code enable
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AM_RANGE(0x800010, 0x80001f) AM_READ(cat_0080_r) AM_MIRROR(0x18FFE0) // Open bus?
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AM_RANGE(0x810000, 0x81001f) AM_DEVREADWRITE8_LEGACY("duart68681", duart68681_r, duart68681_w, 0xff ) AM_MIRROR(0x18FFE0)
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AM_RANGE(0x820000, 0x82003f) AM_READWRITE(cat_s35213_r,cat_s35213_w) AM_MIRROR(0x18FFC0) // AMI S35213 Modem Chip, all access is on bit 7
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//AM_RANGE(0x830000, 0x830001) AM_READ(cat_6ms_counter) AM_MIRROR(0x18FFFE) // 6ms counter?
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AM_RANGE(0x840000, 0x840001) AM_READWRITE(cat_2e80_r,cat_video_status_w) AM_MIRROR(0x18FFFE) // Video status/Output port register
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AM_RANGE(0x820000, 0x82003f) AM_READWRITE(cat_modem_r,cat_modem_w) AM_MIRROR(0x18FFC0) // AMI S35213 Modem Chip, all access is on bit 7
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AM_RANGE(0x830000, 0x830001) AM_READ(cat_6ms_counter_r) AM_MIRROR(0x18FFFE) // 16bit 6ms counter clocked by output of another 16bit counter clocked at 10mhz
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AM_RANGE(0x840000, 0x840001) AM_READWRITE(cat_2e80_r,cat_video_enable_w) AM_MIRROR(0x18FFFE) // Video status/Output port register
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//AM_RANGE(0x850000, 0x850001) AM_READ(cat_video_status) AM_MIRROR(0x18FFFE) // video status read: hblank, vblank or draw?
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AM_RANGE(0x860000, 0x860001) AM_READWRITE(cat_0000_r, cat_test_mode_w) AM_MIRROR(0x18FFFE) // Test mode
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AM_RANGE(0x870000, 0x870001) AM_READ(cat_2e80_r) AM_MIRROR(0x18FFFE) // Open bus?
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@ -646,6 +665,13 @@ TIMER_CALLBACK_MEMBER(cat_state::keyboard_callback)
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machine().device("maincpu")->execute().set_input_line(M68K_IRQ_1, ASSERT_LINE);
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}
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// This is effectively also the KTOBF line to the d-latch before the duart
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TIMER_CALLBACK_MEMBER(cat_state::counter_6ms_callback)
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{
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// TODO: emulate the d-latch here and poke the duart's input ports
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m_6ms_counter++;
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}
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static IRQ_CALLBACK(cat_int_ack)
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{
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device->machine().device("maincpu")->execute().set_input_line(M68K_IRQ_1,CLEAR_LINE);
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@ -655,14 +681,18 @@ static IRQ_CALLBACK(cat_int_ack)
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MACHINE_START_MEMBER(cat_state,cat)
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{
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m_duart_inp = 0x0e;
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m_6ms_counter = 0;
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m_keyboard_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(cat_state::keyboard_callback),this));
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machine().device<nvram_device>("nvram")->set_base(m_p_sram, 0x4000);
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m_6ms_timer = machine().scheduler().timer_alloc(timer_expired_delegate(FUNC(cat_state::counter_6ms_callback),this));
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machine().device<nvram_device>("nvram")->set_base(m_svram, 0x4000);
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}
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MACHINE_RESET_MEMBER(cat_state,cat)
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{
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machine().device("maincpu")->execute().set_irq_acknowledge_callback(cat_int_ack);
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m_6ms_counter = 0;
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m_keyboard_timer->adjust(attotime::zero, 0, attotime::from_hz(120));
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m_6ms_timer->adjust(attotime::zero, 0, attotime::from_hz((XTAL_19_968MHz/2)/65536));
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}
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VIDEO_START_MEMBER(cat_state,cat)
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@ -735,6 +765,12 @@ UINT32 cat_state::screen_update_swyft(screen_device &screen, bitmap_ind16 &bitma
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* TODO: the duart is the only thing actually connected to the cpu IRQ pin
|
||||
* The KTOBF output of the gate array 2 (itself the terminal count output
|
||||
* of a 16-bit counter clocked at ~10mhz, hence 6.5536ms period) goes to a
|
||||
* d-latch and inputs on ip2 of the duart, causing the duart to fire an irq;
|
||||
* this is used by the cat to read the keyboard.
|
||||
*/
|
||||
static void duart_irq_handler(device_t *device, int state, UINT8 vector)
|
||||
{
|
||||
#ifdef DEBUG_DUART_IRQ_HANDLER
|
||||
@ -860,7 +896,7 @@ ROM_START( cat )
|
||||
// since ROM_FILL16BE(0x0, 0x80000, 0x2e80) doesn't exist, the even bytes and latter chunk of the svrom space are filled in in DRIVER_INIT
|
||||
// Romspace here is a little strange: there are 3 rom sockets on the board:
|
||||
// svrom-0 maps to 200000-21ffff every ODD byte (d8-d0)
|
||||
ROMX_LOAD( "uv1__nh7-0684__hn62301apc11__7h1.ic6", 0x00000, 0x20000, CRC(229CA210) SHA1(564B57647A34ACDD82159993A3990A412233DA14), ROM_SKIP(1)) // this is a 28pin tc531000 mask rom, 128KB long
|
||||
ROMX_LOAD( "uv1__nh7-0684__hn62301apc11__7h1.ic6", 0x00000, 0x20000, CRC(229ca210) SHA1(564b57647a34acdd82159993a3990a412233da14), ROM_SKIP(1)) // this is a 28pin tc531000 mask rom, 128KB long
|
||||
// svrom-1 maps to 200000-21ffff every EVEN byte (d15-d7)
|
||||
// no rom is in the socket; it reads as open bus 0x2E
|
||||
// svrom-2 maps to 240000-25ffff every ODD byte (d8-d0)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user