Mr SQL

Yes you can create either one large audio file or a playlist of the audio files to loop on your iPod or CD player and the seek mechanism will find the correct file.
A looping cassette fully emulates disk drive functionality because the tape has to loop, an auto reversing deck will also do this and doubles the capacity for using both sides.
A C-15 on an auto reversing deck will accommodate 2 MB at the fastest baud rate setting which is probably a good idea for a program that large on tape - pushing the technology to that limit will also cause the variable wait time between loads to be up to 1/2 hour.
A a 3 minute continuous looping tape will hold 180K like a floppy disk and the variable load time will feel slightly faster than a Commodore 1541 Disk Drive. 
 But it also depends on the program architecture - those are the average random access times, if you are not using the Tape Drive like a Disk Drive, and always loading the large game modules sequentially, then wait time would only be seconds.

You need a flashcart like the Harmony, Encore, Uno or PlusCart to play the large ROM images, the SuperCharger and CuttleCart can play the big games from Cassette.

BIG DATA for the Atari 2600 via classic hardware and magnetic Tape
SuperCharger Disk BASIC can be used to create Atari programs up to 2 MB in size in a single ROM or on a standard audio cassette with the SuperCharger.
This allows for modular program design with BASIC variables shared between the program modules.
This is made possible by a security subsystem and ISAM mechanism in the SuperCharger that was ahead of it's time much like the ADAM Home Computers high speed indexed tape drive, allowing a directory structure on high speed magnetic tape to function similarly to a Disk drive in principle.
How it works:
Programs load other programs from the directory using standard MS-DOS style commands added to BASIC just like the Microsoft Disk Extended BASIC for the TRS-80 and Dragon computers.

BIG DATA for the Atari 2600 via classic hardware and magnetic Tape
SuperCharger Disk BASIC can be used to create Atari programs up to 2 MB in size in a single ROM or on a standard audio cassette with the SuperCharger.
This allows for modular program design with BASIC variables shared between the program modules.
This is made possible by a security subsystem and ISAM mechanism in the SuperCharger that was ahead of it's time much like the ADAM Home Computers high speed indexed tape drive, allowing a directory structure on high speed magnetic tape to function similarly to a Disk drive in principle.
How it works:
Programs load other programs from the directory using standard MS-DOS style commands added to BASIC just like the Microsoft Disk Extended BASIC for the TRS-80 and Dragon computers.

BIG DATA for the Atari 2600 via classic hardware and magnetic Tape
SuperCharger Disk BASIC can be used to create Atari programs up to 2 MB in size in a single ROM or on a standard audio cassette with the SuperCharger.
This allows for modular program design with BASIC variables shared between the program modules.
This is made possible by a security subsystem and ISAM mechanism in the SuperCharger that was ahead of it's time much like the ADAM Home Computers high speed indexed tape drive, allowing a directory structure on high speed magnetic tape to function similarly to a Disk drive in principle.
How it works:
Programs load other programs from the directory using standard MS-DOS style commands added to BASIC just like the Microsoft Disk Extended BASIC for the TRS-80 and Dragon computers.

100% spot on right there. Pong is an underrated game. When you have a good set of paddles or dials and a friend, it’s especially amazing.

I have more fun with Atari 2600 sports games than modern sports sim games like madden and whatnot.
 

Here are a few of my ideas for double-enders:
1. Defender and Defender II
2. Frogger and Frogger II: Threeedeep!
3. Q*Bert and Q*Bert's Qubes
4. Miner 2049er and Miner 2049er: Volume II
5. River Raid and River Raid II
Those are five ideas off the top of my head.

I think XONOX Double Enders were an awesome concept putting two ROM's in a phat cart. 
What would your wish list of Double Ender Cartridges be if this classic format could be reproduceable Today?
 Here are my picks:
Zaxxon and Pole Position
Popeye and BurgerTime
Mr Do and Ms Pacman
Discs of Tron and M Network Football
SpaceChase and INFILTRATE
Video Chess and Missile Command
Asteroids and Defender
Buck Rogers and Qbert
Star Voyager and Solar Fox
AMIDAR and StarShip
Moon Patrol and Skiing
BeamRider and Gyruss
Commando and Space Invaders
 

Interesting concept
Adventure & Haunted House
Pitfall I & II
Pitfall & Frankenstein's Monster
Tomcat F-14 & Space Shuttle
Battlezone & Robot Tank
Ice Hockey & Basketball
E.T. & Raiders of the Lost Ark
Tax Avoiders & Bank Heist 😉
 

Neat concept! I'd pick:
Donkey Kong and Donkey Kong Junior
Video Chess and Video Checkers
Breakout and Super Breakout

I think XONOX Double Enders were an awesome concept putting two ROM's in a phat cart. 
What would your wish list of Double Ender Cartridges be if this classic format could be reproduceable Today?
 Here are my picks:
Zaxxon and Pole Position
Popeye and BurgerTime
Mr Do and Ms Pacman
Discs of Tron and M Network Football
SpaceChase and INFILTRATE
Video Chess and Missile Command
Asteroids and Defender
Buck Rogers and Qbert
Star Voyager and Solar Fox
AMIDAR and StarShip
Moon Patrol and Skiing
BeamRider and Gyruss
Commando and Space Invaders
 

I think XONOX Double Enders were an awesome concept putting two ROM's in a phat cart. 
What would your wish list of Double Ender Cartridges be if this classic format could be reproduceable Today?
 Here are my picks:
Zaxxon and Pole Position
Popeye and BurgerTime
Mr Do and Ms Pacman
Discs of Tron and M Network Football
SpaceChase and INFILTRATE
Video Chess and Missile Command
Asteroids and Defender
Buck Rogers and Qbert
Star Voyager and Solar Fox
AMIDAR and StarShip
Moon Patrol and Skiing
BeamRider and Gyruss
Commando and Space Invaders
 

I think XONOX Double Enders were an awesome concept putting two ROM's in a phat cart. 
What would your wish list of Double Ender Cartridges be if this classic format could be reproduceable Today?
 Here are my picks:
Zaxxon and Pole Position
Popeye and BurgerTime
Mr Do and Ms Pacman
Discs of Tron and M Network Football
SpaceChase and INFILTRATE
Video Chess and Missile Command
Asteroids and Defender
Buck Rogers and Qbert
Star Voyager and Solar Fox
AMIDAR and StarShip
Moon Patrol and Skiing
BeamRider and Gyruss
Commando and Space Invaders
 

Thanks Jinroh I'm glad you like it! 🙂  
 I wanted to release KC OS before the show but many of the effects look best on a real CRT.
SillyVenture 2020 has been postponed until June but I've shared preview builds with the Game Modem club for players who enjoy using the old hardware:

Dunno how I missed this, but that is both trippy and clever! I always loved the look of your engine. 😄
 

Love the Zaxxon port but Double Dragon Double True! 🙂 
I get knocked out on the first screen and can beat the Arcade with a quarter.  

Among those really old one is Dodge'Em.  I didn't even know it was an arcade port at the time.  It's an excellent game.

Love the Zaxxon port but Double Dragon Double True! 🙂 
I get knocked out on the first screen and can beat the Arcade with a quarter.  

Great thread! So many awesome choices! 🙂 
Here are a few more with some repeats:
COMBAT (2 player)
Wizards of Wor (fun with 1 or 2 players)
Pacman (must have a CRT, otherwise MS Pacman)
Burgertime (underappreciated, it's a great musical I can't get the theme out of my head)
Qbert (played it so much I saw the hidden technicolor disco dream mode before computers found it)
Defender
Beamrider
Commando
Communist Mutants from Space
Buck Rogers
Centipede
Moon Patrol

Great thread! So many awesome choices! 🙂 
Here are a few more with some repeats:
COMBAT (2 player)
Wizards of Wor (fun with 1 or 2 players)
Pacman (must have a CRT, otherwise MS Pacman)
Burgertime (underappreciated, it's a great musical I can't get the theme out of my head)
Qbert (played it so much I saw the hidden technicolor disco dream mode before computers found it)
Defender
Beamrider
Commando
Communist Mutants from Space
Buck Rogers
Centipede
Moon Patrol

I freaking LOVE the Atari 2600! And @socrates63, you don’t need to have played many to make a list. Just pick a few of your favorites if you want to. But as far as recommendations go, it all depends on wether or not you have another person to play with. If you do, try Flag Capture, Artillery Duel, or Home Run. I picked those three as they aren’t terribly well-loved, but they are some of my favorites. With single player games, you really can’t go wrong with any of these listed above. I would add a few, like Popeye, Q*Bert, and Night Driver. There are so many good games on the system.
I brought back the Woody the other day. The picture on there is a lot cleaner than on the Vader! I don’t know why. I think some of the internal components of my Vader are on their way out.

Welcome, @Crash_Corrigan! Front line workers, what a crazy job to have right now. Must be stressful. I hope that you stay safe to not spread it further to anyone! I also hope your symptoms are mild. That virus is an unpredictable creature indeed...
You seem to be quite the collector there, too. I love the generation 2 systems. They’re so interesting. A lot of people my age tend to find the games “too simple”. Hah! Stupid, ignorant children...
But anyways, yeah, I love how unique each system was in the second gen. The O2, Channel F, Studio II; so many unique consoles.
Stick around, old pal. I think you’ll like it here.

WELCOME!  And I sure do hope you get over your COVID quickly and with no issues. 
 

New member here, first post! just tested positive for the Covid 19 today (front line healthcare worker so it was bound to happen!) and am just starting my ten day quarantine. . . which hopefully means lots of retro gaming for me! I collect for the VCS, 7800, Odyssey II and Intellivision. . . but I'm mainly a VCS guy. Been on the hunt since starting college so a good twenty years or so. I'm currently at 395 different games in my 2600 collection. My rarest so far (not including repros like Red Sea Crossing, Gamma Attack, Answer Soft's Gauntlet, etc.) would be: Frankenstein's Monster, Time Warp, Demolition Herby (color label), Motocross Racer, Space Master X-7, H.E.R.O., Montezuma's Revenge, Mr. Chin (Dishaster), Rubik's Cube, Stargunner, UFO (Condor Attack), Mr. Do's Castle, Gremlins, Star Wars Arcade, Death Trap, Up N' Down, Tomarc The Barbarian, Cosmic Corridor, River Raid II, Polaris (green label), Robin Hood/Sir Lancelot. . . some of those weren't so rare when I first got them; Frankenstein's Monster was all of two bucks when I got it from a used game store in Traverse City some ten years ago (along with many other gems)! all time favorite is plain old Adventure and I've collected many of it's hacks and similar games like Epic Adventure and Misadventures Revisited. So hard to find something in the wild that I don't already have but I still always look! I consider an on cart repro of LOTR: Journey To Rivendell to be a holy grail as I've yet to find someone who can make one. . . of course Quadrun, Chase The Chuckwagon, Glacier Patrol and all the other usual suspects are up there as well! anyways just thought I'd share and happy hunting!