Altirra v2.6 is released. Altirra is an Atari 8 bit Emulator on the Windows/DOS platform. Altirra emulates several models of the 8-bit Atari computers. This includes the the 800, 800XL, and 130XE versions. It has a lot of options, and compatibility is decent especially given the emulator's early stages. It also supports some copy protected games properly in emulation.

Altirra v2.6 Changelog:

[changes] Devices: PCLink, DragonCart, XEP-80, SlightSID, Covox, R-Time 8, 850, 1030, P:, and H: have been moved to the Devices tree. [features added] ATBasic: Improved execution speed. ATBasic: Added partial support for CONT statement. ATBasic: Added support for DPOKE, BPUT, BGET, ERASE, PROTECT, UNPROTECT, DIR, RENAME, MOVE, HEX$(), DPEEK(), !, %, &, and $. AltirraOS: Optimized FPI routine. AltirraOS: Improved rounding of FDIV results. BlackBox: Initial emulation support. Debugger: Changed .writemem to use length syntax. Debugger: .basic_dumpline updated with shortcuts for STMCUR/STMTAB and continuous output. Debugger: Added .basic_rebuiltvnt command. Debugger: Added support for one-shot, grouped, and clear-on-reset breakpoints. Debugger: Added support for return tracepoints (bt --). Debugger: Added .sprintf command and @ts tokens. Debugger: Added @t0-t9 (temporary) and @ra (return address) variables. Debugger: Added option to randomize application memory after EXE load (direct EXE load only). Debugger: Added .diskreadsec and .diskwritesec commands. Debugger: Added dbi (dump bytes with INTERNAL text) command. Devices: Added support for SIO-based real-time clock devices. Devices: Added SIO type 3/4 polling test devices. Devices: Added SX212 modem emulation. Devices: Added MidiMate emulation. Disk: Added support for creating and exploring DOS 3 disk images. Disk: Added generic emulation mode with 57,600 baud high speed support. Disk: ATX, PRO, DCM, and XFD disk images can now be written. Disk: Detach Disk commands now turn off disk drives. Disk: Added rotate disk commands. Disk Explorer: Added read/write support for MyDOS and DOS 2.5 disks. Disk Explorer: Added create directory (new folder) option for MyDOS and SDFS disks. Display: Sharp bilinear now works on pixel shader 1.x devices. Display: Vertical overscan can be overridden separately from horizontal. HDevice: Added option to use lowercase filenames. HDevice: H: can now be hot-started or stopped without a reboot. HDevice: H: can now also be installed as D:. IDE: CF hot swapping is now supported. Input: Added support for quick-cycling between a set of input maps. MMU: Axlon banking register aliasing is now optional. Printer: Added SIO-level 820 emulation. Serial: Modem now supports RTS/CTS flow control (&K3). Serial: Added software T: handler and support for 1030 handler bootstrap. Simulation: Added support for mixed NTSC/PAL ANTIC+GTIA combinations (PAL-60 and NTSC-50). Simulation: Added support for more realistic power-on memory patterns. Software: Added Additions disk containing supplementary utilities. UI: Added new firmware management dialog and support for multiple custom OS and BASIC ROMs. UI: Added /[no]cheats switch. UI: Improved high DPI support. UI: Added /portablealt: switch to use alternate INI files. UI: Multiple disk images can now be loaded with repeated /disk switches. UI: Full screen mode state is now saved on exit. UI: Improved full-screen UI. [bugs fixed] ATBasic: Fixed precedence of unary minus vs. exponentiation. ATBasic: Fixed x^y for x<=0. ATBasic: Error messages now indicate STOPPED or line numbers as appropriate. ATBasic: Fixed not being able to Break out of a single-line loop. ATBasic: TRAP line is now reset more appropriately. ATBasic: Fixed range reduction in SIN() and COS(). ATBasic: GRAPHICS no longer reopens E:. ATBasic: Fixed CONT sometimes failing in deferred mode. ATBasic: Fixed parsing errors on the right side of a string relational expression. ATBasic: Banner changed so startup programs that hardcode line 2 work. ATBasic: Use of IOCB #0 is no longer allowed. ATBasic: Out of memory errors are now detected and thrown. ATBasic: PUT now takes an aexpr instead of avar. ATBasic: PTABW is now supported. AltirraOS: SIO no longer saves STACKP before invoking PBI routines (fixes BlackBox crash). AltirraOS: SIO now leaves ICBALZ/ICBAHZ equal to ICBAL/ICBAH for better custom DOS compatibility. AltirraOS: Fixed CRITIC being left on after servicing a PBI-based SIO request. AltirraOS: Fixed GET BYTE returning bogus characters for PBI-based CIO devices. AltirraOS: E: now supports forced read mode. AltirraOS: SETVBV now preserves I flag. AltirraOS: AUX1/2 are now updated properly on R: XIO commands. AltirraOS: Fixed CIO type 4 polling support. AltirraOS: Fix timeout for SIO operations. AltirraOS: Fix ESC-Clear handling in E:. AltirraOS: Cassette boot now reads EOF record. AltirraOS: Fixed diagnostic cartridge handling. ANTIC: Improved emulation of phantom P/M DMA effects. Cassette: Fixed inconsistent motor control state when using C: patch with short IRG mode. CPU: Fixed NMI not triggering early enough when occurring during IRQ entry sequence. CPU: Fixed spurious IRQs when interrupts are masked for more than 2^32 cycles. CPU: Fixed video snow problem when running CPU faster than 1.79MHz. Debugger: -$80000000/-1 no longer causes a crash. Debugger: .printf %%u formatter now works correctly for numbers >=10^10. Debugger: Fixed EXP/EXP10 not being logged to FPACCEL channel. Debugger: Fixed static trace (st) not stopping properly on BRK/RTS/RTI instructions. Debugger: Debug display now reflects CHACTL bits. Disk: Rewrote ATX image parser to be more robust. Disk: Added workaround for XFD images improperly named .ATR. Disk Explorer: Fixed DOS 2 filename encoding for filenames without extensions. Disk Explorer: Fixed directory parsing for double-density DOS 2 filesystems. Display: Fixed crash on display hardware change when using DirectDraw. Display: Added workaround for crash when initializing Direct3D 9 with VirtualBox display driver. Display: Improved windowed mode vsync strategy when DWM is active. Display: Improved quality of NTSC high artifacting mode. GTIA: Fixed DMA reads from hardware registers. HDevice: Fixed NOTE command sometimes giving incorrect positions. HLE: Hook page for H:, P:, R:, T:, and E: hooks is now better at dodging conflicting hardware windows. HLE: Fixed EXP10(-1) returning an error with FP acceleration enabled. HLE: Improved register return values for several FP acceleration calls. HLE: SIO patch acceleration is skipped if the I flag is set. Input: Fixed right mouse button not working on mouse controllers. Input: Keyboard and mouse inputs are now auto-released when display window loses focus. Input: Moved joystick poll before VBI to reduce input delay. Network: Fixed emulated Ethernet packet timing. POKEY: Undetectable $C0-C7 and $D0-D7 scan codes are now blocked. Serial: 6502-based R: handler now waits for output buffers to drain on a close command. Serial: Fixed emulated R: device only draining one byte from transfer buffer per call in unthrottled mode. Serial: Many fixes to 1030 T: device command handling. UI: Fixed mouse pointer blinking when a video player injects mouse moves to prevent the display from sleeping. Ultimate1MB: Fixed SDX control register not gating non-SIDE external cartridges properly. XEP80: Move Cursor to Start of Logical Line ($DB) no longer moves cursor to left margin. XEP80: Set horizontal/vertical position commands now update the cursor address.

Download: Altirra v2.6
Source: Here