Posts by Tag

Software

DRAM and IDE

1 minute read

The last couple of weeks have mostly been spent working on improving the monitor code but there has been some progress on the hardware side as well. Both th...

YM2151 Sound

1 minute read

Getting the sound working turned out to be easier than expected and managed to get the YM2151 playing music fairly quickly. To get some music playing I used...

Monitor ROM

less than 1 minute read

Y Ddraig now has a ROM based monitor program to speed up development and debugging. It’s based on the zBug monitor by Wichit Sirichote. The ability to...

It’s Alive

1 minute read

A working serial port! Tracking down the problem Fixing this involved a bit of head-scratching when trying to track down the problem. All logic signa...

First Software

4 minute read

With the hardware assembled and the CPLD programmed it’s time to start writing some code to test and see if the hardware is working. The first program to te...

Address decoding

3 minute read

Before writing any software for Y Ddraig the CPLD will need to be programmed. The CPLD being used here is a Xilinx XC95108 and it is responsible for the addr...

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Design

PCB Populated

less than 1 minute read

It’s been a while since any updates but some progress has been made. I’ve populated one of the PCBs and powered up the board. All seems fine so the next step...

PCBs delivered

less than 1 minute read

I have recieved the new PCBs. Ordered from https://jlcpcb.com/. Initial inspection shows the boards seem to be fine. Next step now is to start building up o...

PCB design re-started

less than 1 minute read

After a long break from the project I have decided to restart the design making a few changes to the board.

Problems with the PCBs

1 minute read

Started to assemble the first circuit board and run into some immediate problems. It turns out that there is a short circuit between the 5V and GND planes on...

PCB design completed

less than 1 minute read

The schematic design has been done and after many hours routing tracks the PCB layout has been completed and ready to be sent off for manufacture. ...

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PCB

PCB Populated

less than 1 minute read

It’s been a while since any updates but some progress has been made. I’ve populated one of the PCBs and powered up the board. All seems fine so the next step...

PCBs delivered

less than 1 minute read

I have recieved the new PCBs. Ordered from https://jlcpcb.com/. Initial inspection shows the boards seem to be fine. Next step now is to start building up o...

PCB design re-started

less than 1 minute read

After a long break from the project I have decided to restart the design making a few changes to the board.

Problems with the PCBs

1 minute read

Started to assemble the first circuit board and run into some immediate problems. It turns out that there is a short circuit between the 5V and GND planes on...

PCB design completed

less than 1 minute read

The schematic design has been done and after many hours routing tracks the PCB layout has been completed and ready to be sent off for manufacture. ...

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CPLD

First Software

4 minute read

With the hardware assembled and the CPLD programmed it’s time to start writing some code to test and see if the hardware is working. The first program to te...

Address decoding

3 minute read

Before writing any software for Y Ddraig the CPLD will need to be programmed. The CPLD being used here is a Xilinx XC95108 and it is responsible for the addr...

Back to Top ↑

Debugging

It’s Alive

1 minute read

A working serial port! Tracking down the problem Fixing this involved a bit of head-scratching when trying to track down the problem. All logic signa...

First Software

4 minute read

With the hardware assembled and the CPLD programmed it’s time to start writing some code to test and see if the hardware is working. The first program to te...

Back to Top ↑

Errors

Problems with the PCBs

1 minute read

Started to assemble the first circuit board and run into some immediate problems. It turns out that there is a short circuit between the 5V and GND planes on...

Back to Top ↑

Music

YM2151 Sound

1 minute read

Getting the sound working turned out to be easier than expected and managed to get the YM2151 playing music fairly quickly. To get some music playing I used...

Back to Top ↑

Hardware

DRAM and IDE

1 minute read

The last couple of weeks have mostly been spent working on improving the monitor code but there has been some progress on the hardware side as well. Both th...

Back to Top ↑