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initial commit
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Plans for future versions
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=========================
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Keyboard and controllers
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------------------------
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* map host joysticks to Atari ports in the emulation core in order to make
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the configuration available in UI and config file
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* pass the state of all host keys to the emulation core in order to configure
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keysticks in UI and config file
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* standardize key mappings in all ports (making host and Atari layouts
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available everywhere)
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* emulate POKEY keyboard scanning (with optional debouncing)
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* enhance support for pointing devices, including touch screens;
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"directmouse" should work in more ports, support light pen/gun
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and correct mirroring of pad/touch/koala
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* Atari Keyboard Interface (AKI) emulation
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Emulation core
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--------------
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* Java midlet
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* cycle-exact POKEY interrupts (timers, serial I/O, keyboard)
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* precisely emulate serial I/O rates
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* emulate POKEY reset (via SKCTL)
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* more accurate frame rates (for example 49.8607456 instead of 50 Hz in PAL)
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* improve VAPI and .PRO support
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* emulate POKEY SIO shift register
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* emulate SIO bus lines, and SIO cable data/audio cross-talk "feep" sound
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* redirection of specific Dn: devices to Hn: (for software that supports
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only the D: device)
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* log POKEY audio writes, SIO commands (hardware level or DCB level),
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executed Display List commands, all activity to a defined range
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of adressess etc. in a way similar to the 6502 trace
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* log events that affect software compatibility: undocumented 6502 opcodes,
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unofficial system calls (including the 5200), extended memory access
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* emulate drives at the hardware level (810, 1050, XF551.) use code from other
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emulators which does this. (drive rotation, FM/MFM raw bits). WDCxxxx
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controller. RIOT chip. 6507. Intel 8048-line chip for the XFD551.
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Use emulated SIO line for bit-banging. Emulate Drive upgrades (Happy etc.)
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Emulate 3rd party drives (Rana, Karin Maxi etc.)
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* sound effects. Drive retracking noise (BlueMSX has.) Motor whine.
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On/off switch sound. Physical key-press sounds. Cartridge slot sounds.
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Drive door sounds. Floppy rotation flap sound.
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* Atari vapourware emulation. XEM (see below). 1090.
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1060 CP/M (sweet-pea.)
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* emulate the 850 interface at the hardware level.
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* ATR-8000 emulation. ATR-8500.
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Adapt an existing CPM emulator.
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* 6502 BRK bug
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* try to understand 6502's "unstable" opcodes (0x93, 0x9b, 0x9f) that seem
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to have unpredictable (at least not easily predictable) results,
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preferrably by studying 6502 schematics
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* an option to emulate the variant of 6502 used in new XE machines
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(which lacks most of the undocumented opcodes of the classic 6502)
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* fully emulate executing 6502 code from Hardware, cycle-exact ANTIC_load
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from hardware, cycle-exact PMG flickering bus data
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* CPU upgrades (65816, etc)
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* improve emuos so it can boot disks and executables
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* create emuos for 5200
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* emulate printer graphics (on screen or bitmap/PDF output): 1029, 1020, etc.
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The Mac OS X port of Atari800 has lots of printer emulation routines.
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* RAM Carts (cartridges with battery-powered RAM), writes to flash carts
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* serial "network" interfaces (e.g. 8 Ataris connected, is it GameLink?)
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* ability to play multi-player games across network
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* generate hard disk images or write directly to media that the 8-bit Ataris
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can use, like CompactFlash or MyIDE/SmartIDE/BB
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* "Turbo" cassette upgrades (Turbo 2000 etc.)
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* cassette emulation of WAV files. Load a WAV file like WAV2CAS does. Save
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to a WAV file or real cassette like CAS2WAV does. Load voice-and-data
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combined programmed audio tape images from WAV files. Support compressed
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(lossless? lossy even?) tape sound images.
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* disk auto-flip. Examine screen data for text string "Insert Side B
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and press any key/fire/return." Flip disk, print on-screen message and
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optionally press key. More a core feature than UI. Requires a database.
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* support physical floppy media (hard, port-specific and not very useful)
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* support physical Atari drives (hard, port-specific and not very useful)
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* improve the event recording. Avoid cycle-exact RANDOM?
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Graphics
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--------
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* investigate different palettes for different models such as GTIA vs CTIA
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or 400/800, 1200XL, 800XL, XE, 5200, hardware modifications to the colour
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circuts etc.
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* SECAM palette and video emulation.
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* "flicker fixer": display average pixel values of last two Atari frames
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* use YUV output if available. Will it help?
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* PAL emulation. VICE has it, but it's not as complete as Blargg's emulation
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of NTSC. PAL luma/chroma artifacts are missing (it is like S-Video).
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Blargg's optimization technique won't work so easily for PAL.
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(perry: I have a hack of Blargg's slow version of the NTSC emulator that
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I tried to make work for PAL. But it isn't quite right and is way too slow.
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Ask me if you are interested.)
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* the NTSC emulator should support other resolutions. It should be supported
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in all possible ports.
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* fix the remaining bugs in the NTSC emulation. Artificating colours are
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not quite right. odd-even and even-odd combined artifacts (light red
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and light green) do not show unless Gaussian factor is changed a lot,
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which causes even worse artifacts. Fully document the Atari's video
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output signal (might require a scope.) Fully document NTSC decoding
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of late 70's and 80's era TVs.
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* document CTIA and emulate properly. Emulate the players not aligning
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with playfield bug/feature of CTIA which is said to exist. Need
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at least screenshots of a CTIA Atari showing all possible artifacts.
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* an option to emulate the buggy GTIA chip found in new XE machines.
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* fix all remaining collision bugs in the ANTIC and GTIA code (border+scroll,
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player HPOS and GRAF changes, partial_scanline changes.) Use the technique
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of saving data that might generate false collisions, drawing, and then
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restoring the data (pm_scanline).
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* cycle-exact DMACTL and HSCROL including all glitches
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* ANTIC glitch:
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POKE 39974,18:POKE 39975,8:POKE 54276,15
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or
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POKE 39974,18:POKE 39975,40:POKE 54276,15:POKE 54277,15
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* Video Board XE emulation
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Sound
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-----
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* correctly emulate serial I/O sound
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* one POKEY sound engine
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* include sound settings in the emulation core (command line options,
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config file, UI) and make it possible to change them at runtime
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* support WAV files in configurations with no live sound
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* an option to auto-enable stereo when an Atari program uses it
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* Covox emulation
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* 2 POKEY mono, 4 POKEY stereo, 4 POKEY quad
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* MIDI <> serial port interface. In it's simplest form there's only MIDI
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output from the Atari. The more complicated version is enabled by the motor
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control line and includes two MIDI outputs selected by the command control
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line and one MIDI input. There is a MIDI composer program for Atari.
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* A/D Converter - 4-bit sampler that returns 0xf0-0xff in the 0xd500-0xd5ff
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address space.
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* XEM AMY-1 Chip. This is a huge project. Schematics (netlist)
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are said to exist. Prototyping software for the PC (connected to parallel
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port) is available online. Datasheet is online. Need netlist for AMY-1,
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schematics for XEM and any software.
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* SID chip
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User Interface
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--------------
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* make sure all command-line options are available in UI and config file
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* error messages should appear on screen and not in the log
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* on screen display, like a TV remote, for the NTSC (or other) screen filter.
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* support pointing devices (mouse, touch screen) in UI
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* a database to identify programs and choose appropriate settings.
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OS version. Memory size. Memory expansion type. Peripherals.
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Machine type. Joystick/Trackball/Paddle etc. controller type.
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Artifacting mode. SIO patch compatibility. Even if compatible with
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SIO patch, loading screen graphics are often interesting to watch, so
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give the user an option to view or ignore them if present. If not
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SIO patch compatible, optional warp-speed through the loading.
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Keyboard layout. Advisories as to bad dump/bad image/special considerations
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Provide documentation, box scan, label scan for the program
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PAL/NTSC mode. Database should indicate PAL/NTSC
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compatibility, and which system the program was originally designed for.
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Allow PAL users to prefer PAL for NTSC-designed programs, but NTSC users
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to prefer NTSC. NTSC users get PAL (or fake NTSC-upgraded-to-PAL) for
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all PAL-designed programs (Except perhaps very old ones like English
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Software titles that NTSC users might remember.) PAL users get NTSC
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video only for artifacting programs.
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Clean up
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--------
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* make port-specific features available in other ports - now many features
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work only in SDL, Mac OS X or Win PLus
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* clean up the "util" directory - remove obsolete files, write one-file
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documentation for all utils
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* make documentation consistent across systems (HTML?)
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* further clean up in the directory structure - port specific files should
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be hidden in their subfolders (falcon, amiga, ...)
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Speed optimizations
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-------------------
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* use a boolean variable to disable 6502 history tracking and breakpoints
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(even with MONITOR_BREAKPOINTS and MONITOR_TRACE it should be
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faster than currently with just the default MONITOR_BREAK)
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* use function pointer table for hardware registers (like PAGED_ATTRIB does)
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* 6502 emulation optimizations: limit number of CPU_GO() calls (call ANTIC/GTIA
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routines from 6502 and not vice-versa), use ints instead of UWORD and UBYTE,
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merge N and Z flags into one variable, put 6502 flags into local variables
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so they can be stored in registers;
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see http://asap.sourceforge.net for a 6502 emulator which includes these
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optimizations
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* use patches for common routines such as OS interrupt handlers
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* make some hardware registers directly available in memory[]
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* write versions of draw_antic_* functions for the common case when there are
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no sprites in the current scanline
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* update color lookup tables only when color registers change
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* automatic framedrop
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* fast bank switching (without memcpy)
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* implement Dirty Spans (see HOWTO-DIRTYSPAN)
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* an option to detect popular lengthy Atari decompression routines
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and run equivalent C routines instead
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R: device
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---------
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* clean up and comment the code
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* improve portability
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* documentation
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* automatic test (similar to hdevtest.lst for H:)
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* identify security problems
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* TCP port should be configurable (currently hardwired to 9000). The switch
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between real serial port and TCP port should be put there. Something
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along the following lines:
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R_SERIAL = 1
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R_SERPORT = /dev/ttyS0
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R_NETPORT = 9000
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