Tags: Hexagon/hemulator
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Fix TMS9918A and SMS VDP display blank bit semantics (#518) * Initial plan * Fix TMS9918A display blank bit logic and update tests - Corrected TMS9918A register 1 bit 6 interpretation: 0 = display blanked, 1 = display enabled - Updated ColecoVision tests to properly enable display (set bit 6 = 1) - This fixes SG-1000 blue screen issue where games were enabling display but emulator was blanking it - All tests passing: SG-1000, SMS, ColecoVision Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Fix SMS display - always render in Mode 4 - SMS VDP now checks for Mode 4 (register 0, bit 2) - In Mode 4, display is always enabled regardless of register 1 bit 6 - In TMS modes (0-3), register 1 bit 6 still controls display blanking - Fixes issue where SMS games (Sonic, Simpsons, Road Rash) showed nothing - Real SMS games use Mode 4 and don't set register 1 bit 6 for display enable - All 50 SMS tests still pass Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Address code review feedback - improve comments and readability - Clarified that bit 6 in Mode 4 controls 224-line mode - Extracted sprites_enabled variable for better readability - Improved comment clarity about TMS mode bit semantics Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com>
Game Boy: STAT interrupt blocking, boot ROM integration, and cycle-ac… …curate rendering evaluation (#525) * Initial plan * Implement STAT interrupt blocking behavior for Game Boy PPU - Add stat_interrupt_line field to track interrupt line state - Implement edge-triggered STAT interrupts (rising edge detection) - Multiple STAT sources (Mode 0/1/2, LYC=LY) are ORed together - Interrupt only fires on low→high transition, not when line stays high - Add comprehensive tests for STAT blocking behavior - Fixes timing-sensitive games like Worms Armageddon Reference: Pan Docs - Interrupt Sources, SameBoy issue #91 Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Add boot ROM module and improve HDMA timing documentation - Create boot_rom.rs with built-in DMG and CGB boot ROMs - Support for loading external boot ROM files - Define post-boot hardware register states - Add comprehensive timing documentation for HDMA/GDMA - Update TODO.md with completed work and remaining tasks - Update README.md to document STAT interrupt blocking Boot ROM integration will be completed in a follow-up commit. Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Fix clippy warnings and unused code in boot ROM module - Remove unused imports from lib.rs - Add #[allow(dead_code)] to boot_rom module until integration - Fix manual range contains clippy warning - All 167 tests passing, clippy clean Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Address code review feedback - Fix CGB boot ROM indexing: second section (0x0200-0x08FF) now correctly maps to data[256..2304] - Improve STAT interrupt line documentation: clarify initial state is low (false) - All 167 tests still passing Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Complete boot ROM integration for Game Boy - Add apply_post_boot_io_state() to GbBus for I/O register initialization - Add apply_post_boot_state() to GbSystem for CPU and I/O initialization - Automatically apply post-boot state in reset() based on CGB mode - Add is_boot_rom_enabled() getter method - Add 3 comprehensive tests for post-boot state (DMG, CGB, reset integration) - Update TODO.md to mark boot ROM integration as complete The system now properly initializes CPU and hardware registers to match post-boot ROM state, skipping the boot animation while maintaining correct hardware initialization. This fixes edge cases where games rely on specific boot-time register values. All 170 tests passing (was 167). Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Add cycle-accurate rendering evaluation and documentation - Add comprehensive cycle-accurate rendering evaluation in README - Document why frame-based rendering is sufficient (99%+ games) - Note that VRAM access blocking IS implemented correctly - Explain trade-offs: 18x performance impact vs minimal compatibility gain - Update Future Improvements section (boot ROM now complete) - Fix clippy warning for is_boot_rom_enabled (used in tests) **Recommendation**: Cycle-accurate rendering NOT NEEDED - Current frame-based + STAT blocking fixes Worms Armageddon - Mid-scanline effects are extremely rare (demos/homebrew only) - Performance cost not justified for <1% compatibility gain All 170 tests passing, clippy clean. Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com>
Expose paddle controller API and document exotic banking scheme suppo… …rt (#524) * Initial plan * Add paddle controller API and update documentation for completed features Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> * Fix code formatting (remove trailing whitespace) Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> Co-authored-by: Hexagon <hexagon@56k.guru>
Fix SNES 16x16 tile rendering and 65C816 CPU instruction bugs (#520) * Initial plan * Fix SNES 16x16 tile scrolling - use char_size for tilemap pixel dimensions Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Fix 65C816 BRK/COP instructions and add STP halt state Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Implement Mode 7 multiply result registers ($2134-$2136) Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Address code review: add FLAG_BREAK constant, improve Mode 7 readability Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Add comprehensive tests for BRK, COP, STP instructions and improve Mode 7 multiply test Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com>
Fix TMS9918A display blank bit - tiles rendered when display blanked (#… …516) * Initial plan * Fix TMS9918A display blank bit handling Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com>
Add ColecoVision controller mappings for Player 1 and Player 2 (#513) * Initial plan * Add ColecoVision controller support with numeric keypad buttons Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Update documentation for ColecoVision controller mappings Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Run cargo fmt to fix formatting Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com>
Add optional BIOS mount point for SMS system (#515) * Initial plan * Add BIOS mount point support for SMS system Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Fix clippy warnings and format code Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Address code review feedback: fix comments and export bios module Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Hexagon <hexagon@56k.guru> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> Co-authored-by: Hexagon <419737+Hexagon@users.noreply.github.com>
Fix ColecoVision Player 2 keypad conflicts and TMS9918A sprite transp… …arency (#514) * Initial plan * Fix ColecoVision Player 2 control mapping conflicts Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Fix TMS9918A sprite transparency (SG-1000 and ColecoVision) Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> * Add test coverage for TMS9918A sprite transparency fix Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: Oliodh <249356858+Oliodh@users.noreply.github.com> Co-authored-by: Hexagon <hexagon@56k.guru>
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