Search found 8 matches

by Pax_1601
Sat Nov 18, 2017 4:42 pm
Forum: Hardware
Topic: Simple Direct Memory Access Video Circuit
Replies: 3
Views: 4219

Simple Direct Memory Access Video Circuit

Hello everyone!

1 year or so I wrote a post asking for help in finding a way to output video for my 6502 based computer project. I got many good suggestions, and I've succesfully implemented a composite video output using an ATMEL ATMega328. Now I was thinking of some way of achieving a similar ...
by Pax_1601
Wed Jul 27, 2016 5:44 pm
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Re: Text display for 6502 based projects.

You might want to consider using a TMS9918a. During the 80's it was used in the TI 99/4a, the MSX computers, and the ColecoVision games console. So there are a ton available as new old stock and used system pulls on eBay. It requires its own RAM, and although it is designed to use dynamic RAM, some ...
by Pax_1601
Wed Jul 27, 2016 6:52 am
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Re: Text display for 6502 based projects.

If you want to drive the pixels yourself, then I certainly second the previous recommendations on the Don Lancaster books. I own several of his books and I think I have all of the cheap video series.

I'd like to throw out a few more options too. Don't dismiss microcontrollers completely. There are ...
by Pax_1601
Wed Jul 27, 2016 6:44 am
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Re: Text display for 6502 based projects.

Here's my two cents on simple video, having done it several ways myself.

Composite b/w text

Do the Don Lancaster "cheap video" method. It will work if you don't mind the extra board space.

Use a microcontroller - 1 or two chips and a few parts - here's the one I did -> http://sbc.rictor.org ...
by Pax_1601
Tue Jul 26, 2016 8:38 am
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Re: Text display for 6502 based projects.

Just to be clear, since as I stated I'm a total newbie: your "Cheap Video" solution allows to produce a video output in the form of composite video signal? Is composite still viable on modern TVs? Composite video is easily doable; or, if you like, you could have a separate SYNC signal. I imagine ...
by Pax_1601
Tue Jul 26, 2016 8:25 am
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Re: Text display for 6502 based projects.

The 6502 primer's chapter 15 is on displays:
http://wilsonminesco.com/6502primer/displays.html

(Do go through the whole primer though. It's organized in logical steps, so skipping around may not be very appropriate.)

Thank you for your answer :) I'm in the process of reading the primer, and I ...
by Pax_1601
Tue Jul 26, 2016 7:38 am
Forum: Newbies
Topic: Text display for 6502 based projects.
Replies: 18
Views: 4614

Text display for 6502 based projects.

Hello everybody,

I'm a total newbie to the world of 6502 based computers, and I have a very simple question that you probably already received a lot, but I can't find a definitive answer.
I'm looking forward to starting a small project on the 6502. I know that is extremely soon to talk about ...
by Pax_1601
Fri Jul 22, 2016 2:15 pm
Forum: General Discussions
Topic: Introduce yourself
Replies: 716
Views: 418293

Re: Introduce yourself

Hi everbody!

I'm a 24 years old soon to be (hopefully) aeronautical engineer. I've always been attracted to digital electronics, I've been playing with Arduino's for some time but I wanted to understand what was going on "under the hood". I steered my attention to x86 assembly code but things got ...