[Atari] Test7800 0.7.4 09/01/2026

[75] faust @ !!! Piątek, 9 Stycznia 2026 23:55 CET [08-01-2026 00:41 CET]

JetSetIlly, autor Gopher2600 - emulatora Atari2600 (na siłę, można i przyjąć i RAMBO;)) już od chwili pracuje nad nowym emulatorem kolejnej konsoli ATARI - Atari 7800 - test7800.

Konsola zacna, niestety ze skromną biblioteką gier, dająca popalić czytelnikom gazet w latach osiemdziesiątych - to zapewne jej zawdzieczamy poszukiwania Double Dragon, Commando czy też Ikari Warriors na ATARI XE/XL (autorzy recenzji przyjmowali, że skoro to ATARI i nie ST, to pewno chodzi o XE/XL;)).

Projekt jest świeży, jednak patrząc na Gophera2600, możemy się spodziewać kolejnego fajnego emulatora w piaskownicy Tramiela.

Impossible Mission

Test7800 0.7.4 9/01/2026

fixed single button games
- games like Dig Dug and Donkey Kong did not work
- this bug was introduced in v0.7.3 (#34)

note that previous version was significant enough that it should have been numbered v0.8.0. but there's nothing I can do about that now :-/

Test7800 0.7.3 7/01/2026

support for paddles and trakball

click right-mouse-button to toggle input

insertion is controlled entirely by the a78 header required for now. there are no command line options yet

automatic overscan detection

added -overscan command line option. set to AUTO by default

other options are NONE, MODERN, and FULL

implemented high score cartridge

a78 header is obeyed by default (-hsc command line option is set to AUTO)

implemented savekey

a78 header is NOT obeyed by default (-savekey command line option is set to FALSE)

if -savekey is set to AUTO (obey a78 header) or TRUE (always insert savekey) then the savekey is inserted into the right player port

play in full-screen

press F11 to toggle

re-ported CPU package from Gopher2600

fixes XAA and ANE instructions

CPU now passes the newly included Thom Harte single-step tests

randomised parts of the emulation are now properly random

fixed seed was used inadvertently

various changes to debugger

added commands and altered output

re-ported ARM and ELF package from Gopher2600

now includes chameleon cart NV ram functions

→ NOWSZY [Atari.Area] Test7800 0.7.3

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→ [Atari.Area] Test7800 0.7.2

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→ [Atari] Test7800 0.7.2 29/10/2025

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Test7800 0.7.2 29/10/2025

fixed implementation of ARR (undocumented 6502 instruction) corrects result of test binary in https://forums.atariage.com/topic/385516-fingerprinting-6502-processors

Test7800 0.7.1 18/10/2025

Drag and Drop

dropping of files should now work on all platforms including Windows and WASM

POKEY mapping

reading a POKEY address is now not possible, except for the random number register

the data of the underlying cartridge is read instead

this fixes a bug which caused Stone Age to fail

the game reads ROM addresses right down to $4000 which is where POKEY is mapped

test7800 0.7.0 12/10/2025

Gamepad

a gamepad or similar controller can now be used for player 1 input

Drag and Drop

dropping a ROM file from the desktop onto the application window will immediately load that ROM

this has not been well tested on Windows or MacOS

test7800 0.6.3 6/10/2025

Audio

sample rate increased to 48000Hz

this improves POKEY audio that uses the 1.79Mhz clock

it's not always noticeable but pure tones generated by this clock can suffer when sampled a rate that is too low

the higher the sample rate the better but 48000Hz is a reasonable compromise value

added -samplerate option to allow setting the value

Cartridge Mappers

Activision mapper (#28)
Absolute mapper (#30)

test7800 0.6.2 29/09/2025

Audio

corrected POKEY two-tone mode

game music for A.R.T.I now sounds correct

Cartridge Mappers

SN2 mapper is now called Eagle

SN1 mapper is now referred to simply as SN

Other

-ignore option now changed to -checksum

setting -checksum to false will allow unsigned cartridges to pass the NTSC checksum BIOS routine

test7800 0.6.1 28/09/2025

Audio

improved POKEY emulation
corrected how channels are filtered by other channels corrected reset time for 16bit timers. this affects the musical pitch of those channels when using the 1.79Mhz clock implemented two-tone mode

test7800 0.6.0 21/09/2025

Audio

added POKEY soundchip

-audio=stereo for stereo output of both TIA and POKEY

stereo for POKEY is only really effective for dual POKEY ROMs

Cartridge Mappers

and SN2 correctly (previous version was SN1 only)

use -mapper=SN2 or -mapper=SN1 as appropriate

test7800 0.5.1 7/09/2025

I messed up the release of v0.5.0 and hadn't included the Tiger Heli fix

test7800 0.5.0 7/09/2025

Cartridge Mappers

implemented Banksets

and SN2

Other Improvements

changed television overscan size

this fixes visual presentation of Tiger Heli

Note that SN2 must be specified as the -mapper on the command line. There is currently no way of forcing a mapper type if launching from the desktop icon.

test7800 0.4.3 2/09/2025

Bug fixes

tweaked pre-DMA and interrupt overhead values

this fixes Ballblazer (#19) while maintaining previous fixes for for Karateka and Scrapyard Dog

correct frame rate when running with no audio (-audio=false)

test7800 0.4.2 24/08/2025

Bug fixes

controller intialisation for two-button joysticks

fixes #20, #21, #22, #23, #24

player-two input is not yet implemented the issue of constant firing is fixed

Bug fixes [Windows]

emulator will exit correctly if ROM fails to load from file dialog [#18]

second effort after bug reports persisted with v0.4.1

test7800 0.4.1 23/08/2025

Ace of Ace (1988, Atari)

I messed up the release of v0.4.0 a little bit. This is a re-release with a bumped version number

Changes since v0.3.0

Bug fixes

INPT2 and INPT3 should have high bit set when joystick is plugged in

fixes Crazy Brix

extended bottom of visible screen by one for both NTSC and PAL

to match information given by '7800 Test (20141231).a78'

delay after interrupt is not DMA blocking

Kung-Fu Master [#14]

Ikari Warriors [#16]

DMA now only ever starts at end of CPU cycle

Ace of Aces [#17]

improves DMA tests in '7800 Test (20141231).a78'

corrected DMA maximum cycles limit

fixes Super Skateboardin' [#15]

corrected RIOT timer address mapping and tick rate

fixes Beef Drop [#13]

Bug fixes [Windows]

emulator will exit correctly if ROM fails to load from file dialog [#18]

this fix is still contested

test7800 0.3.0 18/08/2025

Changes since v0.2.0

Bug fixes

6502 will halt (due to RTI) mid-instruction if necessary

cycle cost for DLI was being applied at the end of every DLL zone regardless of the DLI bit

fixed how DMA cycles for holey graphics are accumulated

DMA cycle cost for last DL header in sequence

all bug fixes contributed to fixing Scrapyard Dog (#12)

and to providing improved fixes for previously bugged games (eg. Karateka)

A78 Cartridges

recognition of supergame cartridges that don't require bank switching but do require additional RAM or ROM

Ballblazer is a good example of such a cartridge

Joystick Emulation

prevention of impossible joystick positions

ie. up/down (and left/right) not possible at same time

fixes graphical anomaly in Robotron (#10)

added numberpad 'arrows' as input option for joystick direction

regular cursor keys still usable

addded 'Z' and 'X' as joystick fire buttons

space button and 'B' button still usable

Debugger

improved STEP SCANLINE

improved overlay

simplified colours of DMA areas

diagonal stripes indicate VBLANK area

Palettes

changed PAL palette to NTSC_A78_CRTTV_BRT.pal and NTSC_A78_CRTTV_BRT.pal

test7800 0.2.0 12/08/2025

Changes since v0.1.0

Bug fixes

DL can end with non-zero mode value (bits 5 and 7 ignored)

fixes Ninja Golf (#2), One-on-One Basketball (#9)

corrected the number of cycles in the pre-DMA phase of a scanline

fixes Summer Games (#11), Karateka (#7), Crossbow (#3)

TIA ticked at correct rate and taking slow memory accesses into account

fixes Jinks music and speed samples (#5)

DPPL and DPPH only read at beginning of DMA

fixes Fatal Run (#6), Motorpsycho (#8), Midnight Mutants (#1)

colour kill bit was not implemented

fixes Midnight Mutants (#1)

removed erroneous memory mapping to system ram

fixes Choplifter! (#4)

fixed single stepping in the debugger

Audio

improved synchronisation with video meaning fewer audio buffer underruns

this works well for the Linux version but has not been tested much on Windows

Palettes

changed PAL palette to PAL_LUM3_COOL.pal

test7800 0.1.0 5/08/2025

first public rel

→ [Atari.Area] Test7800 0.7.1

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→ [Atari.Area] Test7800 0.7.0

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