Recent Posts

Expansion card: YM2151 Audio

This sound card is based around the Yamaha YM2151 8 channel FM synthesiser. It was used in some Yamaha synthesisers and systems such as the Sharp X68000 and ...

Expansion card: TMS9918A

When I ordered the new PCB for Y Ddraig, I also ordered some additional expansion card PCBs. A couple of these I had made previously and just moved the desig...

New PCB for Y Ddraig

One of the things that I have been working on is a new circuit board design for Y Ddraig. Superficially the board design is much like the previous revision. ...

FPGA Video card update

I’ve been working on several areas on Y Ddraig the last couple of months and I have been making some good progress. I’ll be posting some updates on some of t...

FPGA Video card CPU access

In my previous post, I had the VGA output working and was able to display several test patterns. I briefly mentioned that I could read data from the SRAM on ...