[c64] Emu64 5.2.0 04/06/2026

Emu64 5.2.0 04/06/2026

• NEW! [#224] The GeoRAM size can now be set. There are four different sizes: 512KB, 1MB, 2MB, and 4MB.
• NEW! [#224] New command-line parameter "--set-georam-size" sets the size of the GEORAM memory in KiB (512, 1024, 2048, 4096).
• NEW! The contents of a Chip ROM from a C64 cartridge can now be read and saved as a binary file.
• NEW! [#225] The REU size can now be set. You can choose between 128KB, 256KB, 512KB, 1MB, 2MB, 4MB, 8MB, and 16MB.
• NEW! [#225] New command-line parameter "--set-reu-size" Sets the size of the REU memory in KiB (128, 256, 512, 1024, 2048, 4096, 8192, 16384).
• NEW! reSID has now been added to Emu64. You can choose between Emu64 SID and reSID. ReSID offers more accurate emulation but also increases CPU load.
• NEW! DigiBoost is now configurable for SID MOS-8580. Emu64 SID and reSID
• NEW! The sound buffer size can now be adjusted in the settings. A restart of Emu64 is required.
• NEW! New command-line parameter "--set-sid-engine" Sets the SID emulation engine. You can choose between "emu64" and "resid" (0=Emu64, 1=reSID).
• NEW! Now, when using a T64 containing multiple files, you can select which file to start. A new window will open displaying the included files.
• NEW! TAP files have now been added to the autostart. TAP files can now be started automatically.
• NEW! An alternative renderer can now be selected when starting Emu64. This is necessary so that Emu64 can also run in a virtual machine under VirtualBox. The C64 screen was always black.
• NEW! [#295] New command-line parameter "--use-sdl-renderer". The SDL2 renderer can now be activated with this parameter. It should only be used if there are display problems.
• [#233] Fixed: Commands could not be passed to the Linux AppImage. This has been fixed.
• [#258] Fixed: The branch target address was calculated incorrectly in the debugger/disassembler.
• [#252] Fixed: The "--debugcart" command was not working correctly. It should now work as intended.
• [#271] Fixed: There was a problem exporting a PRG file from a D64 image. It could end in an infinite loop, and the file would become infinitely large. :) This problem has been fixed.
• [#294] Fixed: A crash occurred when the User Palettes window was opened twice. This should now be fixed.
• [#207] Fixed: When various C64 files (D64, CRT, TAP) were autostarting, the corresponding windows were not updating correctly. This should now be fixed.
• Fixed: Sporadic crashes occurred when using "--debugcart". This should now also be fixed.
• Fixed: Occasional crashes occurred when switching between Warp Mode and Normal Mode. This should now be fixed.
• Fixed: "--limitcycles" in conjunction with "--autostart" was not working correctly. It was not terminating automatically. This should now be fixed.
• FileBrowser has been reworked so that information is updated when using the cursor keys, not just when clicking. For example, in the Floppy Window or Cartridge Bridge Window.
• Fixed: Fixed a problem with video recording. This should now work again.
• Fixed: Fixed the "connectSlotsByName" warnings in Qt6: Renaming slots and adding explicit connections.
• Fixed: Qt6 --nogui --limitcycles was not terminating – now explicitly calling QCoreApplication::quit() instead of just close().
• Fixed: Corrected the break flag in the 6502 and 6510 emulation.
• Fixed: It was not saving correctly to a TAP image. This now works correctly again.
• Fixed: Occasionally, a crash occurred when switching between CRT images in the Cartridge Bridge Window. This should no longer happen.
• Fix in AM29F040Class
• FloppyEmulation: Changed from byte-wise access to bit-wise access to GCR data. This improves emulation accuracy and better detection of sync points.
• REU: LoadRAM has been reworked to support RAM sizes of 512KB, 1MB, 2MB, and 4MB.
• crossbuild-win-releases.sh has been adjusted.
• create_linux_appimage.sh has been adjusted / Now requires the Qt root directory to be specified. Example: "create_linux_appimage.sh --qt /usr/lib/qt6"
• Several memory leaks have been fixed with Valgrind and AddressSanitizer. Emu64 should now run more stably and terminate more cleanly.
• strcpy has been replaced everywhere with snprintf, which should prevent buffer overflows.
• Replaced by QFontDatabase adapted to the new variant
• Many "deprecated" warnings from ffmpeg have been fixed, so Emu64 should now compile and run with ffmpeg 6.x and higher.
• And many minor bug fixes and compiler warnings resolved.

From Felix Palmen (Zirias)
Add a CI build with gcc and clang
Fixed quazip dependency for FreeBSD
code cleaning<

• [#210] Fixed: F1 and F5 were incorrectly set when mapping. (F1 and F5 may have to be re-mapped!)
• [#216] Fixed: If multiple "." sometimes the ending was evaluated incorrectly
• [#217] Fixed: Floppy1541: LoadDiskImage -> UnLoadDiskImage only if a known type (D64, G64) was also transferred.
• NEW! If the floppy 1541 has an error, this is now indicated in the status window by an exclamation mark next to the floppy volume. By clicking on it, the current error is displayed in the error channel.
• NEW! [#219] Added new command line parameter "--video-filter-off". This switches off the video CRT mode when starting, no matter what is in the emu64.ini. However, the emu64.ini remains unaffected.
• NEW! [#219] Added new command line parameter "-double-texture-off". The video output texture is temporarily not doubled.
• NEW! [#219] New command line parameters "--enable-reu" and "--enable-georam" Activates the REU or the GeoRam at startup.
• NEW! [#219] New command line parameter "--set-sidtype" The SID type can now be set via command line. At the moment only the 1st SID
• [#219] Fixed: "--exitscreenshot" Screenshots when exiting the emulator should now be displayed correctly.
• NEW! [#291] Added new command line parameter "--set-palette". Temporarily sets a C64 color palette at startup. emu64.ini remains untouched here as well.
• [#221] Fixed: "make install" called "strip" for all files, but should only happen for binarys Adjusted crossbuild-win-releases.sh to better configure whether to compress and which architectures to build. x32 and x64
• [#106] Fixed: "--nogui" really doesn't show any windows anymore. If --nogui is specified then no --nosplash is required
• [#226] Fixed: The disk ID from the BAM (18/0) is adopted in all sectors when mounting a D64 image. Previously 0 was always written.
• [#182] Fixed: Illegal opcodes SHA, SHS, SHX, SHY / The Trap17 test failed because the microcodes 134,135,136 and 137 had an incorrect address for the calculation of the new value that is written to memory.
• [#227] + [#228] GeoRam and Reu are now recognized. The problem was that --autostart first removed a CRT. With that, the GeoRam or REU that had just been set was thrown out.
• Fixed: Adjusted RAM init pattern. darkstarbbstest.prg and typicaltest.prg are now running too.
• [#230] Fixed: Emu64 no longer crashes when exiting with employee warp mode.
• [#223] Removed lock and unlock mutex from EnableWarpMode
• [#231] SHX & SHY Partial implementation of the "unstable" behavior.
• Fixed: BreakGroups -> OpenFileDialog start directory changed from home to the last one.
• NEW! Added new script "create_linux_appimage.sh" to create an appimage for Linux
• NEW! [#237] New video CRT emulation implemented. A PAL Delyline is now also emulated to simulate better color mixing. The Y-Blur is also a bit nicer than before.
• The whole thing is currently a bit slower than the old version.
• [#236] Fixed: There were several display issues in the debugger under Windows 11. These should now be fixed.
• NEW! [#236] Debug logging has been implemented again.
• NEW! [#236] An area can now be specified in a BreakGroup for reading from and in an address.
• NEW! [#236] Added new documentation for the "*.bpt" files in doc.
• NEW! [#236] If you double-click in the history list in the debugger, the disassembler listing is automatically displayed at this point.
• NEW! [#236] When changing a register in the debugger, a separate window opens where you can change the value.
• NEW! [#236] In the debugger memory window you can now jump directly to a position without scrolling. The bit display has been removed.
• NEW! [#236] In the debugger, the memory can be exported again as a RAW file.
• Fixed: The floppy status field in the Emu64 main window has been adjusted and is now displayed correctly under Windows 11
• Fixed: PRG export in debugger
• Fixed: Many windows have been reworked to be displayed sensibly under Windows 11.
• NEW! Added a 60Hz button in Settings/Emulation.

From Felix Palmen (Zirias)

• [#235] Fixed: Build with ffmpeg 6. This doesn't attempt to replace deprecated functions, it only replaces functions that are gone (avcodec_encode_[audio|video]2) with straight-forward replacement code. It fixes the build with the latest 6.0 release and still builds fine with ffmpeg 4.4

5.0.19

• old SDL_OpenAudio replaced by the current SDL_OpenAudioDevice
• Output of all audio devices in the Emu64 log file
• Bugfix: [# 188] Sound problem when the audio device has more than 2 channels has been fixed
• Bugfix: C64 :: LoadPRG LoadError LogOut add n
• Bugfix: [# 191] fixed in c64_class.cpp char -> signed char // char is not always signed char
• partial correction unsigned char -> uint8_t char -> int8_t if no string
• fixed compiler warnings
• SDL2 error message is output in emu64.log if SDL_OpenAudioDevice fails.
• Bugfix: [# 192] AudioBufferSize changed from 882 to 1024. According to SDL2, this must be a power of 2.
• Bugfix: [# 192] Emu64 is now terminated properly, even if an error occurs in the C64Class :: OnInit. The log should then be written cleanly.
• SDL errors are now better logged.
• Sound buffer size is now loaded via emu64.ini, 512 is set as the default.
• If a sound buffer size smaller than 64 is entered in the ini, the sound buffer size is set to 64.
• By Felix Palmen: Move Single Application from shared memory to socket
• Bugfix: In the debugger, when a breakpoint entry is changed, this is now also taken over immediately (previously you had to remove the checkmark and then set it again)
• [# 198] Colodore palette added (not CRT mode)
• Obsolete Qt methods replaced setBackgroundColor -> setBackground / setTextColoer -> setForeground
• various adjustments to compile Emu64 with Qt6. ZIP support deactivated for QT6 because there are still problems with quazip // DEFINES + = ZIP_SUPPORT = true -> commented out
• The cycles per second for the C64 emulation can now be set
• VSync can now be activated again in the settings
• src.pro adapted for the current mxe build
• Full screen modes can now be set again. For each screen individually.
• MainWindow adjusted
• SetupWindow adjusted
• VideoCrtSetupWindow adjusted
• VideoCrtSetupWindow: Output value for phase shift shortened to 2 decimal places.
• FloppyWindow "None blind mode" corrected
• C64SpeedWindow adapted
• C64 user palette can now be adjusted in Emu64
• CRT mode can also use the user palette
• Bugfix fix: if the color angle (color_angle) in the odd line was zero, the color value was undefined (wrong colors).
• Bugfix: Floppy display Motor + R / W LED -> shape from round to square
• Floppy Read / Write LED can now display PWM. (LED fading effects)
• BugFix: C64 mouse can be activated again with CTRL-Left and mouse button.
• [# 201] New HotKey ALT-J JoyPorts are swapped.
• [# 202] New HotKey ALT + W Toggle Warp Mode
• Text file hotkeys.txt added
• [# 189] Before the video recording, the C64 frequency is set to exactly 50 FPS. So there is no pulling apart the audio and video tracks.
• Activate console for Win32 Verion. So you can see the output of the help in the CMD or PowerShell again.
• SDL_Init only with video, audio and game controller. This means that Emu64 can also be started under WINE.
   

5.0.18

• Bugfix: SyncFound in Floppy1541Class
• [issue #170] D64 Directory Liste im FloppyWindow wird jetzt sofort bei Veränderungen im Image aktuallisiert
• Ocode "BIT" in 6502 & 6510 überarbeitet
• [issue #173] Fix Soundproblem beim Disk Formatieren
• Pepto Luminaz Levels eingebaut. First VICII Revision hat nur 5 Luminanz Abstufungen, alle anderen 9
• Es kann nun gewählt werden ob die Luminanz Level der erste oder der folgenden Revisionen benutz werden
• Video CRT Emulation überarbeitet und an Pepto angelehnt
• [issue #171] Alle Dateinamen die aus einem QString nach char* konvertiert werden, erledigt jetzt .toLocal8Bit vorher toUtf8
• [issue #175] Filename wird jetzt beim Export richtig vorgegeben, und am ende stehende Leerzeichen entfernt
• NMI & IRQ ueberarbeitet. (6510 & 6502)
• Bugfix: in der Floppy1541Class, es wurden immer alle Laufwerke emuliert obwohl sie abgeschaltet waren
• Bugfix: mos6502 + mos6510 irq_delay
• Bugfix: Warp Modus
• Bugfix: Debugger - Breakgroups Save & Load geht wieder
• [issue #181] Pause Button im C64SpeedWindow funktioniert wieder.
• [issue #180] Beim lesen der CPU aus der Adresse 0xde00 - 0xdfff wird immer der zuletzt gelesene VIC Wert aus der ersten Phase des Taktzyklus gelesen.
• [issue #185]  Alle Fenster werden beim fehlen der emu64.ini oder des entsprechenden Eintrages in dieser, in der Bildschirmmitte dargestellt.
• Comandline Befehl --reset-ini kann nun an beliebiger Stelle stehen. Bis jetzt musste --reset-ini an erster stelle stehen um ausgeführt zu werden.
• [issue #176] Magic Desk Cartridge ist nun implementiert, jedoch erstmal read-only.
• [issue #106] Neuer Comandline Befehl --minimized hinzugefügt
• crossbuild-win-releases.sh überarbeitet (SHA512 Checksummen ausgabe)
• Audio Oszilloskop für SID Ausgabe hinzugefügt