EMUAPC is an emulator of 8-bit Atari computers 400/800, 800XL, 65XE, 130XE. EMUAPC emulates, among others banks switching without slowing down, high-quality sounds with noise, and cycle-exact POKEY interrupts. The emulator works with sound cards fully compatible with the Sound Blaster standard for the DOS environment.

Requirements of EMUAPC DEMO:

Computer with the i486/Pentium processor or better, 8MB the RAM, the operating system MS-DOS.
This version is running in the DOS environment of systems Windows 3.0 and higher, Windows 95/98/Me, Windows 2000/XP/NT, OS/2 1.1. To getting the full quality of sound in the DOS environment of systems Windows 2000/XP/NT an emulator of Sound Blaster cards is required e.g. VDMSound.

EMUAPC DEMO emulates:
  • The following models of the Atari computers:
    • 800 switches: 64KB RAM, Atari OS rev.A
    • 800XL switches: 64KB RAM, Atari OS rev.B, Atari Basic rev.B
    • 65XE switches: 64KB RAM, Atari OS rev.B, Atari Basic rev.C
    • 130XE switches: 128KB RAM, Atari OS rev.B, Atari Basic rev.C
  • All opcodes of the 6502 processor
  • All opcodes of the Antic processor including with operations of horizontal and vertical scrolling and DLI interrupts
  • All graphics and text modes of the CTIA chip
  • All additional modes of the GTIA chip
  • Hardware interrupts system
    • Interrupts reported across the NMI line:
      DLI - Display List Interrupt
      VBI - Vertical Blank Interrupt
    • Interrupts reported across the IRQ line:
      T1 - Timer 1
      T2 - Timer 2
      T4 - Timer 4
      SIR - if Serial Input Ready
      ODN - if Output Data Needed
      XD - if eXmitend Data
      K - Keyboard
      BREAK - Break (BREAK button interrupt)
    • RESET interrupt - Reset (RESET button interrupt)
  • PM graphics (Player-Missle graphics)
  • Fast banks switching with separable access (at 128KB RAM) to the memory for Antic and 6502
  • All sound registers of the POKEY chip
  • Two floppy drives working in the density of S, E and D with the possibility of preparing to eight virtual disks for each drive
    • Emulator recognizes low-level disk operations through PERCOM blocks. Recognized disk operations:
      kod 83 - status
      kod 82 - read sector
      kod 80 - write sector
      kod 87 - write sector with verification
      kod 33 - format for S and D densities
      kod 34 - format for E densities
      kod 78 - get density
      kod 79 - set density
    • Emulator supports bad sectors (damaged sectors). These sectors are identified by a sequence of the first ten bytes of the sector corresponding to the text "BAD SECTOR"
  • One Atari joystick on the PC keyboard
  • Selected software graphics modes
  • Pseudo-artifacts for the high resolution graphic mode (0xF)
  • Provides following screen resolutions:
    • 320x240
    • 360x240
    • 360x270
  • Provides the possibility to sync 50Hz or to the frequency of hardware vertical blank
  • Provides graphical user interface with the ability to change the background bitmap
  • Automatically recognizes the following file formats:
    • Atari DOS (*.xex,*.exe,*.com)
    • Atari floppy disk (*.atr)
    • Atari floppy disk (*.xfd)
    • Atari floppy disk packed with Disk Communicator program (*.dc3,*.dcm)
    • Atari floppy disk packed with SCopy program (*.vol)
    • In the case of Atari DOS format, files are saved on a virtual floppy disk in the density of E or D with the loader in the boot sectors, and then such virtual floppy disk is booted
  • Provides slow and fast transmission mode (track buffer)
  • Provides protection against the possibility of recording separately for each virtual disk
  • Provides a counter of sectors during the work of virtual disk drives
  • Provides special effects during the Reset/Restart the emulator, the transition to the help system or finishing work with the emulator
  • Provides parameters for co-operation with the Sound Blaster mixer (the possibility of a full adjustment volume of sound, bass and treble)
  • Provides the possibility of utilizing external color palettes and has its own built-in color palette