There’s a new contender being prepared for the 8-bit console arena, but will it find anyone there? The new GameTank by Clydeware is an open source design leveraging venerable MOS Technology 6502-based processing. However, it may punch well above its weight, with its clean-sheet dismissal of legacy baggage, its twin-CPUs, and its custom framebuffer-based graphics architecture.
Importantly, the GameTank isn’t for playing games (or emulators) from other 8-bit systems. It is designed to be a standalone ecosystem to inspire “the next generation of 8-bit games.”
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According to the specs shared by Clydeware, the new GameTank is built upon just basic logic and RAM chips, with no FPGAs or microcontrollers in sight. Peculiarly, for a retro console, the GameTank’s motherboard features twin CPUs. The processors chosen are enhanced CMOS versions of the popular 6502, which first became available in 1975. Readers may be familiar with the 6502 as it was behind classic systems such as the Apple II, Commodore PET, Atari VCS, Nintendo Entertainment System, and more.
Swipe to scroll horizontally GameTank specifications CPU WDC's W65C02S clocked at 3.5 MHz Video 128x128 framebuffer, some rows on top and bottom hidden by most TVs Graphics acceleration Hardware-accelerated byte copy, also known as a "Blitter", can transfer images to the framebuffer on every clock cycle at 3.5 MHz Graphics RAM 512 KB used as source data for blitter General purpose RAM 32 KB banked in 8 KB sections Audio W65C02S at 14 MHz with 4KB RAM, default 14 kHz sample rate Controller D-Pad + "A" "B" "C" and "Start" buttons, 2x ports Cartridge Custom 36-pin 0.1-inch pitch format, standard board contains 2 MB of flash memory Expansion port 26-pin rear expansion port exposing 12 bits of GPIO and other system signals
As you can see in the table, above, the GameTank uses a WDC W65C02S clocked at 3.5 MHz as its general purpose CPU, with a W65C02S running at 14 MHz dedicated to audio duties. The system architecture's RAM allocation is also atypical for an 8-bit console. You can see the GameTank has 32KB of system RAM, but a whopping 512KB RAM for graphics, which the developers have dubbed ‘Sprite RAM.’
Clydeware’s balancing of resources indicates that the GameTank architecture leans on a hefty framebuffer and blitter for “smoother and more fluid animations.” This contrasts to 6502 consoles of yesteryear, like the aforementioned NES, which would feature tile/sprite based screen addressing and where scrolling was sometimes choppy.
Other GameTank features that are worth calling out include its “big chunky cartridges,” which are custom but open in design. Tools for flashing ROM files to these carts are available, and the cart has a USB-C port for convenience.
On the topic of games development, the console designers suggest the use of a C SDK based around CC65, an open-source compiler targeting 6502-family processors. However, it also says that “any toolchain able to generate 6502 assembly can target the GameTank platform.”
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