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https://github.com/TomHarte/CLK.git
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Transcribe the Yamaha 9938 register meanings.
This commit is contained in:
Thomas Harte
parent
191cf4829b
commit
4efda108c6
@ -560,7 +560,7 @@ void Base<personality>::write_register(uint8_t value) {
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write_phase_ = false;
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if(value & 0x80) {
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if constexpr (is_yamaha_vdp(personality)) {
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value &= 0x7f;
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value &= 0x3f;
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} else if constexpr (is_sega_vdp(personality)) {
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if(value & 0x40) {
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Storage<personality>::cram_is_selected_ = true;
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@ -571,17 +571,10 @@ void Base<personality>::write_register(uint8_t value) {
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value &= 0x7;
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}
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// This is a write to a register.
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// This is a write to a register; handle all generic
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// TMS registers here (with potential extra bits).
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switch(value) {
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case 0:
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if constexpr (is_sega_vdp(personality)) {
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Storage<personality>::vertical_scroll_lock_ = low_write_ & 0x80;
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Storage<personality>::horizontal_scroll_lock_ = low_write_ & 0x40;
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Storage<personality>::hide_left_column_ = low_write_ & 0x20;
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enable_line_interrupts_ = low_write_ & 0x10;
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Storage<personality>::shift_sprites_8px_left_ = low_write_ & 0x08;
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Storage<personality>::mode4_enable_ = low_write_ & 0x04;
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}
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mode2_enable_ = low_write_ & 0x02;
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break;
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@ -600,10 +593,6 @@ void Base<personality>::write_register(uint8_t value) {
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case 2:
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pattern_name_address_ = size_t((low_write_ & 0xf) << 10) | 0x3ff;
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if constexpr (is_sega_vdp(personality)) {
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Storage<personality>::pattern_name_address_ = pattern_name_address_ | ((personality == TMS::SMSVDP) ? 0x000 : 0x400);
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}
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break;
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case 3:
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@ -616,16 +605,10 @@ void Base<personality>::write_register(uint8_t value) {
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case 5:
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sprite_attribute_table_address_ = size_t((low_write_ & 0x7f) << 7) | 0x7f;
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if constexpr (is_sega_vdp(personality)) {
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Storage<personality>::sprite_attribute_table_address_ = sprite_attribute_table_address_ | ((personality == TMS::SMSVDP) ? 0x00 : 0x80);
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}
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break;
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case 6:
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sprite_generator_table_address_ = size_t((low_write_ & 0x07) << 11) | 0x7ff;
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if constexpr (is_sega_vdp(personality)) {
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Storage<personality>::sprite_generator_table_address_ = sprite_generator_table_address_ | ((personality == TMS::SMSVDP) ? 0x0000 : 0x1800);
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}
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break;
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case 7:
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@ -633,39 +616,196 @@ void Base<personality>::write_register(uint8_t value) {
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background_colour_ = low_write_ & 0xf;
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break;
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case 8:
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if constexpr (is_sega_vdp(personality)) {
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default: break;
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}
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if constexpr (is_sega_vdp(personality)) {
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switch(value) {
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default: break;
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case 0:
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Storage<personality>::vertical_scroll_lock_ = low_write_ & 0x80;
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Storage<personality>::horizontal_scroll_lock_ = low_write_ & 0x40;
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Storage<personality>::hide_left_column_ = low_write_ & 0x20;
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enable_line_interrupts_ = low_write_ & 0x10;
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Storage<personality>::shift_sprites_8px_left_ = low_write_ & 0x08;
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Storage<personality>::mode4_enable_ = low_write_ & 0x04;
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break;
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case 2:
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Storage<personality>::pattern_name_address_ = pattern_name_address_ | ((personality == TMS::SMSVDP) ? 0x000 : 0x400);
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break;
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case 5:
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Storage<personality>::sprite_attribute_table_address_ = sprite_attribute_table_address_ | ((personality == TMS::SMSVDP) ? 0x00 : 0x80);
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break;
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case 6:
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Storage<personality>::sprite_generator_table_address_ = sprite_generator_table_address_ | ((personality == TMS::SMSVDP) ? 0x0000 : 0x1800);
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break;
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case 8:
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Storage<personality>::horizontal_scroll_ = low_write_;
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} else {
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LOG("Unknown TMS write: " << int(low_write_) << " to " << int(value));
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}
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break;
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break;
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case 9:
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if constexpr (is_sega_vdp(personality)) {
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case 9:
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Storage<personality>::vertical_scroll_ = low_write_;
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} else {
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LOG("Unknown TMS write: " << int(low_write_) << " to " << int(value));
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}
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break;
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break;
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case 10:
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if constexpr (is_sega_vdp(personality)) {
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case 10:
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line_interrupt_target_ = low_write_;
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} else {
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LOG("Unknown TMS write: " << int(low_write_) << " to " << int(value));
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}
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break;
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break;
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}
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}
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case 15:
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if constexpr (is_yamaha_vdp(personality)) {
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if constexpr (is_yamaha_vdp(personality)) {
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switch(value) {
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default: break;
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case 0:
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LOG("TODO: Yamaha additional mode selection; " << PADHEX(2) << +low_write_);
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// b1–b3: M3–M5
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// b4: enable horizontal retrace interrupt
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// b5: enable light pen interrupts
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// b6: set colour bus to input or output mode
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break;
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case 8:
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LOG("TODO: Yamaha VRAM organisation, sprite disable, etc; " << PADHEX(2) << +low_write_);
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// b7: "1 = input on colour bus, enable mouse; 1 = output on colour bus, disable mouse" [documentation clearly in error]
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// b6: 1 = enable light pen
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// b5: sets the colour of code 0 to the colour of the palette (???)
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// b4: 1 = colour bus in input mode; 0 = colour bus in output mode
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// b3: 1 = VRAM is 64kx1 or 64kx4; 0 = 16kx1 or 16kx4; affects refresh.
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// b1: 1 = disable sprites (and release sprite access slots)
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// b0: 1 = output in grayscale
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break;
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case 9:
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LOG("TODO: Yamaha line count, interlace, etc; " << PADHEX(2) << +low_write_);
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// b7: 1 = 212 lines of pixels; 0 = 192
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// b5 & b4: select simultaneous mode (seems to relate to line length and in-phase colour?)
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// b3: 1 = interlace on
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// b2: 1 = display two graphic screens interchangeably by even/odd field
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// b1: 1 = PAL mode; 0 = NTSC mode
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// b0: 1 = [dot clock] DLCLK is input; 0 = DLCLK is output
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break;
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case 10:
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LOG("TODO: Yamaha colour table high bits; " << PADHEX(2) << +low_write_);
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// b0–b2: A14–A16 of the colour table.
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break;
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case 11:
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LOG("TODO: Yamaha sprite table high bits; " << PADHEX(2) << +low_write_);
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// b0–b1: A15–A16 of the sprite table.
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break;
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case 12:
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LOG("TODO: Yamaha text and background blink colour; " << PADHEX(2) << +low_write_);
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// as per register 7, but in blink mode.
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break;
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case 13:
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LOG("TODO: Yamaha blink display times; " << PADHEX(2) << +low_write_);
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// b0–b3: display time for odd page;
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// b4–b7: display time for even page.
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break;
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case 14:
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LOG("TODO: Yamaha A14–A16 selection; " << PADHEX(2) << +low_write_);
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// b0–b2: A14–A16 of address counter (i.e. ram_pointer_)
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break;
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case 15:
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Storage<personality>::selected_status_ = low_write_ & 0xf;
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}
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break;
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break;
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default:
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LOG("Unknown TMS write: " << int(low_write_) << " to " << int(value));
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break;
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case 16:
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LOG("TODO: Yamaha palette index selection; " << PADHEX(2) << +low_write_);
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// b0–b3: palette entry for writing on port 2; autoincrements upon every write.
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break;
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case 17:
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LOG("TODO: Yamaha indirect addressing; " << PADHEX(2) << +low_write_);
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// b7: 1 = disable autoincrementing; 0 = enable.
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// b5–b0: register number
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break;
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case 18:
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LOG("TODO: Yamaha position adjustment; " << PADHEX(2) << +low_write_);
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// b0-b3: horizontal adjustment
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// b4-b7: vertical adjustment
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break;
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case 19:
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LOG("TODO: Yamaha interrupt line; " << PADHEX(2) << +low_write_);
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// b0–b7: line to match for interrupts (if eabled)
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break;
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case 20:
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case 21:
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case 22:
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LOG("TODO: Yamaha colour burst selection; " << PADHEX(2) << +low_write_);
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// Documentation is "fill with 0s for no colour burst; magic pattern for colour burst"
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break;
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case 23:
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LOG("TODO: Yamaha vertical offset; " << PADHEX(2) << +low_write_);
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// i.e. scrolling.
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break;
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case 32:
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case 33:
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LOG("TODO: Yamaha command source x; " << PADHEX(2) << +low_write_);
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break;
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case 34:
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case 35:
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LOG("TODO: Yamaha command source y; " << PADHEX(2) << +low_write_);
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break;
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case 36:
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case 37:
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LOG("TODO: Yamaha command destination x; " << PADHEX(2) << +low_write_);
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break;
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case 38:
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case 39:
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LOG("TODO: Yamaha command destination y; " << PADHEX(2) << +low_write_);
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break;
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case 40:
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case 41:
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LOG("TODO: Yamaha command size x; " << PADHEX(2) << +low_write_);
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break;
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case 42:
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case 43:
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LOG("TODO: Yamaha command size y; " << PADHEX(2) << +low_write_);
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break;
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case 44:
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LOG("TODO: Yamaha command colour; " << PADHEX(2) << +low_write_);
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break;
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case 45:
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LOG("TODO: Yamaha VRAM bank selection addressing and command arguments; " << PADHEX(2) << +low_write_);
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// b6: 0 = video RAM; 1 = expandion RAM.
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// b5: MXD (???)
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// b4: MXS
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// b3: DIY
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// b2: DIX
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// b1: EQ
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// b0: MAJ
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break;
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case 46:
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LOG("TODO: Yamaha command; " << PADHEX(2) << +low_write_);
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// b0–b3: LO0–LO3 (???)
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// b4–b7: CM0-CM3 (???)
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break;
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}
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}
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} else {
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// This is an access via the RAM pointer.
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