Commander X16 Emulator (Win/Mac/Linux) r41 ("Marrakech")

Main differences:

• faster
• VERA accuracy improvements
• better SD card emulation
• ROM: full-featured DOS implementation (SD card)

You can attach an SD card image with -sdcard; there is a sample image in sdcard.img.zip. See x16-emulator README on how to mount it on Mac/Linux/Windows, and CMDR-DOS README for the supported DOS features.

Emulator:

• CPU
  • added WAI, BBS, BBR, SMB, and RMB instructions [Stephen Horn]
• VERA
  • VERA speed optimizations [Stephen Horn]
  • fixed raster line interrupt [Stephen Horn]
  • added sprite collision interrupt [Stephen Horn]
  • fixed sprite wrapping [Stephen Horn]
  • added VERA dump, fill commands to debugger [Stephen Horn]
  • fixed VRAM memory dump [Stephen Horn]
• SD card
  • SD card write support
  • Ctrl+D/Cmd+D detaches/attaches SD card (for debugging)
  • improved/cleaned up SD card emulation [Frank van den Hoef]
  • SD card activity/error LED support
  • VERA-SPI: support Auto-TX mode
• misc
  • added warp mode (Ctrl+'+'/Cmd+'+' to toggle, or -warp)
  • added '-version' shell option [Alice Trillian Osako]
  • new app icon [Stephen Horn]
  • expose 32 bit cycle counter (up to 500 sec) in emulator I/O area
  • zero page register display in debugger [Mike Allison]
  • Various WebAssembly improvements and fixes [Sebastian Voges]

ROM:

• KERNAL
  • new macptr API to receive multiple bytes from an IEEE device
  • load uses macptr for LOAD speeds from SD card of about 140 KB/sec
  • hacked (non-functional) Commodore Serial to not hang
  • LOAD on IEEE without fn defaults to ":*"; changed F5 key to "LOAD"
  • fixed screen_set_charset custom charset [Rebecca G. Bettencourt]
  • fixed stash to preserve A
  • entropy_get: better entropy
• FPLIB
  • optimized addition, multiplication and SQR [Michael Jørgensen]
  • ported over INT(.9+.1) = 0 fix from C128
• BASIC
  • updated power-on logo to match the real X16 logo better
  • like LOAD/SAVE, OPEN now also defaults to last IEEE device (or
  • fixed STOP key when showing directory listing (DOS"$")
• CHARSET
  • changed PETSCII screen codes $65/$67 to PET 1/8th blocks
• DOS
  • switched to FAT32 library by Frank van den Hoef
  • rewrote most of DOS ("CMDR-DOS"), almost CMD FD/HD feature parity
    • write support
    • new "modify" mode ("M") that allows reading and writing
    • set-position support in PRG files (like sd2iec)
    • long filenames, full ISO-8859-15 translation
    • wildcards
    • subdirectories
    • partitions
    • timestamps
    • overwriting ("@:")
    • directory listing filter
    • partition listing
    • almost complete set of commands ("scratch", "rename", ...)
    • formatting a new filesystem ("new")
    • activity/error LED
    • detection of SD card presence, fallback to Commodore Serial
    • support for switching SD cards
    • details in the CMDR-DOS README
  • misc fixes [Mike Ketchen]