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PicoCalc x86 Version 0.0.3 Release

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@shtirlic shtirlic released this 20 Jul 15:50
v0.0.3
cf7dc6b
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shtirlic Serg Podtynnyi
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Changelog

0.0.3 - 2026-07-20

Added

  • Floppy Drive Support: Full 3.5" 1.44MB floppy drive emulation (Drive A:)
    • Auto-creation of blank floppy images in FAT12 format
    • Read/write support for floppy disk images
    • Proper boot retry logic with disk reset
  • Extended Serial Support (PS/2-style):
    Display Reset: Custom CRTC display reset bit (0x3D8 bit 7) support
  • RAM Expansion: Memory available to DOS increased to 432 KB
  • Enhanced BIOS:
    • Boot failure detection and retry mechanism
    • Better disk operation handling with proper error recovery
    • Improved clearscreen with attribute support
    • Floppy disk parameter table support

Changed

  • Memory Layout: Optimized address mapping and available RAM allocation
  • BIOS Revision: Updated from 0.6 to 0.7
  • Compiler Configuration:
    • Updated pico-sdk 2.3.0 compatibility
    • Switched to custom RISC-V toolchain path configuration
    • Added linker script overrides for text and rodata sections
  • CPU Emulation:
    • Refactored opcode decoding tables into structured formats
    • Improved instruction decode performance with specialized table structures
    • Better flag handling and arithmetic operations
  • Serial Communication:
    • Enhanced serial port functions with better state management
    • Improved baud rate configuration
    • Better RX FIFO and TX FIFO management
  • Display Driver:
    • Improved CGA mode 1-bit graphics rendering (proper bit pair handling)
    • Enhanced clearscreen functionality
    • Display reset callback mechanism
  • Video System:
    • Screen resolution properly initialized before rendering
    • Better CGA graphics mode support

Fixed

  • BIOS Data Area: Row value corrected from 25 to 24 for proper paging and cursor positioning
    • Validated with CGA_COMP compliance tests
  • CGA Clearscreen: Fixed to properly handle video attributes
  • Serial FIFO Operations:
    • Fixed RX FIFO clearing behavior
    • Fixed TX FIFO clearing with proper UART restart
  • Graphics Mode: 1-bit mode now properly combines bit pairs for pixel data
  • Boot Sector: Added proper boot failure message and halt on retry exhaustion
  • Code Generation:
    • Fixed compiler warnings and code structure issues
    • Removed obsolete EMS (Expanded Memory System) references
    • Proper memory section placement for performance
  • Display: Fixed display reset control with proper bit masking
Assets 6
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