Hello again,

I've made some progress - I've gotten PS/2 Keyboard input, Color (3-bit color so 8 colors), and a way to upload the ROM via the UART on my development board. I tried implementing 16 colors à la "VGA Mode 0" by turning off the RGB lines every screen frame, but at 30 Hz it was too ...

Hi everybody,

I haven't posted in a while, but I did decide to implement a 65C02 softcore (Jens Gutschmidt's cpu6502_tc ) in an FPGA, along with VGA output in order to, in the longterm, have some fun with IDE hard drives.

For the moment, I have got the CPU and monochrome VGA output working, and ...

I have used mouser in France twice, and each time the shipping was fast (3 business days). Have to watch out for VAT though, it gets added at the end of the order, but you can either choose to pay it directly on your bill, or to pay it on delivery. Shipping was free for orders over 75 EUR.

For WDC ...

Hello again everyone,

Sorry if this is a little late( I've been busy lately), but a very big thanks for your helpful advice concerning this project. Even though I haven't updated the website as regularly as I was planning to, I am getting bits and pieces of it done as I go along on pieces of paper ...

Oh, I get it now. Relay "kind of equals" impedance termination with a wet transformer in my case because I have a relatively simple setup. I had understood using relays as in switching on and off to share the DAC/ADCs. In retrospect, I don't know why I thought that, as it is a very, very bad idea ...

As much as I'd love to use relays to hear some clicking noises, I'm afraid I need to consider using all 4 lines at the same time. And unless I'm mistaken, I'm pretty sure relays clicking on and off at 8000 times per second, unless in a perfect world, die rather quickly and create terrible noise on ...

Hello everyone,

I'm finding myself in a situation which would require me to build a telephone multiplexer (albeit a simple one!) for a school project. As of right now, I'm thinking of having 4 (phone) lines to multiplex (2 seems too little, and 8 too much).

This originally being a school project ...

I hope no one will get angry at me for reviving such an old thread, but a lot of things have happened since then and now, leaving me little time for my interest in electronics (such as taking my IB exams, deciding where to go for university, and finding a future place to live).
I was still looking ...

Hi everybody,
Long time no see. I've been very busy with schoolwork, and living in a country far away from any electronics stores and with an unreliable (as in usually 70% of packages are 'inspected') postage system, I had to put my electronics hobby on the side. However, over the past 2 weeks, I've ...

Hello again everyone,

First of all, I'd like to give a huge thanks to Garth Wilson for that detailed thread on serial buses. It really helped me understand the differences and options available.

Sorry for my delay in replying to all, but the last two weeks were the end of my quarter in school ...

Are you familiar with SPI, Mr.Linux? SPI, I²C, Microwire, and other synchronous serial methods are super-nice solutions for a lot of interfacing problems.

Err, I daresay I only know what they are in rough terms. Its basically, instead of sending the data at regular time intervals over a parallel ...

They have the 65c51 available in samples, but the bug on page 33 of the data sheet is apparently still keeping them from considering it ready for full production

That bug wouldn't bother me a whole lot, but I think I will just use the MAX3100 for the moment. Maybe when they get it fixed I'll see ...

MrLinuxGuy, please feel free to take back your thread which we kind of hijacked. If you would like, we can start another topic and take the oscilloscope graphics discussion there (although I'm not sure there's much more to discuss at the moment).

Ah, I don't mind. It's an interesting read anyways ...

Yes, I am a person who often changes his mind. I always say things are definitive, but in fact I don't mean that to 100%. Just know that I usually think like this: if it must change, it will, and if it's fine the way it is, then it let it be.

Indeed, I have decided to go for the 65816. Ill save the ...

First of all, thanks for the helpful information you've been giving me. I now understand why and how capacitors and resistors are used on circuits, and I now also understand how to create a timing circuit for the CPU (that was learned by reading a bit on the forums here, and a helpful couple of tips ...