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-f3
- The -f parameter tells dasm what format to use for the output file. For an Atari 2600 or Atari 7800 game you'll want to use -f3, which is the "raw" format-- no file header, and the object file will be a single chunk of contiguous code.
forums.atariage.com/topic/208951-help-with-installing-dasm/Help with installing dasm - Atari 7800 Programming - AtariAge ...
Jun 4, 2012 · What would be the best way to "test" my code on the 7800 using ProSystem Emulation? In other words how is this done? Also, do I have to tell DASM something special to have it compile for the 7800 (6502 processor) rather than some other system? Thanks!
Mar 14, 2021 · Looking for a 32-bit dasm executable? Find them in the releases . [*] Console-specific header files and common macros are included for the Atari 2600 VCS , the Atari 7800 and the Fairchild Channel F VES .
Feb 20, 2014 · Atari 7800 (new!!) This is version 2.20.12 of DASM. Short summary of most important fixes/changes: For all supported OS's (Linux, macOS and Windows) there is both a 32-bit (x86) and a 64-bit (x64) build. Console-specific header files and common macros are included for:
- Introduction
- Overview of The 7800
- Overview of Maria
- Overview of Tia
- Overview of 6532
- Inptctrl Register
- Appendix 1: 7800 Memory Map
- Appendix 3: DMA Timing
The 7800 is a product which combines the ATARI 2600 hardware with a new graphics chip called MARIA. The entire 2600 library of cartridges will run on the 7800 as they do on the 2600, but new cartridges designed to access the improved hardware will be able to take advantage of a large number of improvements.
Ignoring the 2600 environment, which is identical to the ATARI 2600, the 7800 environment is characterized by the following: 1. (2) 6116's 1.1. 4K bytes of RAM 2. 6532 2.1. I/O 3. TIA 3.1. sounds 3.2. some input ports. 4. Expanded cartridge slot 5. SALLY (6502) 5.1. microprocessor running at 1.79 MHz. 6. MARIA 6.1. all video Additionally, there is ...
Graphics
MARIA does not employ the concepts of players, missiles, and playfield, as do the 2600 and 5200. Instead MARIA uses an approach to graphics commonly used in coin-operated games. Each raster of the display may be thought of as a bit map. This map is contained in an area of the MARIA chip called the Line RAM. Information is first stored into the Line RAM, then later read from Line RAM and displayed on the screen. Consider for a moment just one raster of display. One would compose this raster's...
Display
For NTSC consoles, there are a total of 263 rasters per frame (~1/60th second). The "visible" screen (during which MARIA attempts display) starts on raster 16 and ends on raster 258. The area found visible on all television sets starts on raster 41 and ends on raster 233, 192 scan lines later. Any display outside this area may not appear on all televisions. See Appendix 4, Frame Timing, for more details. For PAL consoles, there are a total of 313 rasters per frame. (~1/50th per second). The “...
Sound
In TIA there are two audio circuits for generating sound. They are identical but completely independent and can be operated simultaneously to produce sound effects through the TV speaker. Each audio circuit has three registers that control a noise-tone generator (what kind of sound), a frequency selection (high or low pitch of the sound), and a volume control.
The I/O Ports
The two ports (Port A and Port B) are 8 bits wide and can be set for either input or output. Port A is used to interface to various hand-held controllers but Port B is dedicated to reading the status of the console switches and joystick buttons.
The INPTCTRL register is responsible for switching and locking the 7800 into either 2600 or 7800 mode. It's a write-only register mapped to $0000-$001F, and controlled by external circuitry.INPTCTRL's address range overlaps TIA's address range. As a consequence, once this register is set you need to also set the lock bit (see below) before you can ...
The memory map of the 7800, graphically illustrated on the next page, is in many ways similar to that of the 2600, with the addition not only of MARIA, but also of 4K of RAM. This RAM is shadowed (responds to other addresses) in zero, first, second, and third pages, the first two of these being significant. You will notice the absence of the 128 by...
There is some uncertainty as to the number of cycles DMA will require, because the internal MARIA chip timing resolution is 7.16 MHz, while the 6502 runs at either 1.79 MHz or 1.19MHz. As a result, it is not known how many extra cycles will be needed in DMA startup/shutdown to make the 6502 happy. It is even possible for the 6502 to be in the middl...
DASM, an assembler for the 6502 and other processors, is distributed with the 7800AsmDevKit. Its documentation is here. 7800header is distributed with 7800basic and the 7800AsmDevKit. Its a stand-alone command-line menu-driven program that can be used to add or modify A78 headers on ROM images.
Nov 8, 2024 · Now the new game cartridges are no longer officially available for purchase and you can only play the Windows version of it (which includes the ROM anyways), so it's impossible for all MAME-based 7800 emulators to ever support this game. tachimarten or Tachi added Rikki & Vikki support for ProSystem and libretro.
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Inspired by the original ‘80s design, this scaled-down version fits today’s living rooms and connects easily to modern TVs via HDMI. It supports both 2600 and 7800 game cartridges and comes with the new Wireless CX78+ Gamepad, an untethered recreation of the radical controller Atari released with the 7800 in Europe in the ‘80s.
