Kolejne poprawki i kolejne zmiany w Altirrze, emulatorze ośmiobitowych komputerów ATARI (seria XL/XE i konsola 5200, być może zostanie kiedyś dodany także XEGS;)). Nad kodem tego emulatora stoi Phaeron, którego nawet Ci, którzy w życiu nie słyszeli o emulatorach, na pewno kojarzą dzięki narzędziu do edycji video - VirtualDub.
Halley Project - jedna z ciekawszych produkcji jakie ukazała się w roku 1985, a nazwa jej związana była z kometą Halleya, która w 1986 (luty) zagościła na niebie. Ponoć komety zawsze zwiastują nieszczęścia, coś w tym jest... dwa miesiące później nastąpiła awaria chłodzenia w Czarnobylu (kwiecień 1986).
Version 2.00 test 27:
- features added
- Debugger: Break on expression command (bx) can now include address ranges.
- bugs fixed
- Disk: Disk explorer now properly increments volume sequence number when modifying SpartaDOS X images.
- HLE: Boot loader now sets DBYTLO/DBYTHI to $0400 before launching.
- SoundBoard: Restricted $D5/D6xx mapping to $D500-D53F and $D600-D63F.
Version 2.00 test 26:
- features added
- UI: Added MRU list for booted images.
- GTIA: Optimizations to mode 9 and mode 10 rendering.
- POKEY: Rewrote sound core to defer repeating events whenever possible for extra speed.
Version 2.00 test 25:
- features added
- SoundBoard: Multiplier support
Version 2.00 test 24:
- bugs fixed
- Disk: Fixed H: device not handling zero-byte get/puts properly with burst I/O enabled (affected GET/PUT from BASIC).
- Disk: H: device now supports OPEN with AUX1=7 to fix directory listing from DOS 2.5.
Version 2.00 test 23:
- bugs fixed
- UI: Disk sector display was incorrect for accelerated writes.
Version 2.00 test 22:
Version 2.00 test 21:
- bugs fixed
- HLE: Screen setup now matches the display list and playfield addressing of the stock OS ROM.
- HLE: Fixed cartridge handling so that cartridges are run after disk boot completes.
- HLE: Added known RTS instruction at $E4C0.
- HLE: CIO now allows SPECIAL commands to be issued on a closed IOCB.
It also contains a fix for not being able to format double-sided disks, which I didn't add into the changelog because there was already an entry for fixing PERCOM block problems.
Version 2.00 test 20:
- features added
- Disk: Disk explorer now properly increments volume sequence number when modifying SpartaDOS X images.
- Disk: Live disk images can now be explored directly from the disk drive entry rather than requiring an unmount and remount.
- Disk: Disk explorer shows timestamps.
- Disk: .ARC compressed archives can now be explored.
![[ATARI] Altirra 2.0 test XXVII](www/picphoto/19a443df1.jpg)
I was struck by both nostalgia and ambition and started to write a new 8-bit Atari emulator from scratch. This is the result.
At this point, I've learned a lot more about the Atari and Altirra now emulates more than I ever had or did years ago, but I still work on it periodically. It also serves as a modularity test for the VirtualDub code base, from which Altirra shares some components. If you are struck by nostalgia too or have a desire to do some Atari development, perhaps it might be useful to you, too.