One interesting thing I noticed while trying to understand the PDK docs is that it seems to support making a 5V chip, which has very limited support on similar priced FPGAs that you can easily source today.

Here's a pic of the circuit and an example of its output. (Made separate post because shaky internet connection)

A while ago I posted about my approach to generating color composite video here. I built one again this week so I could record the process and explain while I put it together.

https://youtu.be/DYYeoiDy5Es

It stops short of displaying video data from memory, which I plan to do as a companion video ...

Quotes I got are for US, Canada, EU, UK. They weren't as high as I heard full testing and certification are, since these are basically just doing the testing to back up self-certification. Helps that nothing on this is an intentional radiator. Hopefully I don't have to send it back too many times ...

More updates- finally started the crowdfunding campaign on Crowd Supply (basically Kickstarter for open source hardware)
Campaign:
https://gametank.zone/crowdsupply
Announcement video:
https://youtu.be/Zg9weWX294c

Still waiting on one more board revision from PCBWay to send off a representative ...

Glad that you are making progress on the GameTank! Does this solution cost less? Or was there lacking inventory on the dual-port RAM?

Do you hand solder each GameTank yourself? Even the surface mount version?

The dual-port RAM got hard to find anywhere but AliExpress, but it also does cost less ...

What are the chips sitting on the bodged in breadboard? The two SRAMs and the shift register? (I've never used DIP SRAMs before so whilst they look physically small to me I don't have a point of reference).

The SRAMs are already on the board, I had orderd a PCBWay assembled prototype of my RAM ...

So, you had one pending write for some small number of clock cycles? Something like a writeback queue, but very short? Nice idea!

Indeed! The access pattern is highly regular. The clocks involved are small number fractions off of each other, so there's only really five potential offsets between a ...

I wanted to share a technical victory I just had on this project: I've finally designed the IDT7007 dual-port SRAM out of the system by replacing it with a pair of single-port SRAMs.
My solution takes advantage of one side being read-only: Writes immediately take effect on the "system side" RAM, and ...

but at speeds up to 2MHz with no faster testing

Oops. I'm debugging a prototype that does this at 14MHz but maybe it's doomed from the start.

I'm trying to replace a dual-ported RAM with some manner of bus sharing. My "audio bus" is a 14MHz WDC 6502 and a 10ns SRAM, which are separated from the ...

I'm probably going to end up dedicating a significant portion of my 55 minute JawnCon talk to (an attempt at) demystifying color video.
My phase delay comes from clocking a shift register at 8x the color frequency - about 28.6363MHz - and feeding the data pin with the color carrier.
The rest is just ...

I tried to do something like this once, but it was early into my 3D printing and electronics "career" and I made a lot of mistakes and couldn't get it working.

Putting holes on the tape to control timing makes a lot more sense than what I tried, which was to put a magnet on a gear that would pass ...

Things have been very busy in GameTank world. I had booths at two gaming conventions and a hacker conference last month and I sold 17 "developer bundles" consisting of the main console unit, a controller, a blank cartridge, and the cartridge flasher. Next month I'll be giving a talk at JawnCon0x2 ...

I got my MCP130s in the mail and they work in the same footprint I had designated for DS1813. $0.50 is a much nicer price than $3.80

I also just ordered a pack of MCP130s to try on the GameTank. I procrastinated adding auto reset for too long, and have to tell people "hit the red button, and then the yellow one" when they try it at conventions.

Oh well. You know you've become a real OEM when you start selling a dongle to fix a ...