Re: Explanation of the Woz's shift-registers based video output

[Thomas Lecomte <deather.dede@no.spam.gmail.com>]

Vince -

	Thanks you a lot. I think I'll use your solution. :-)
I checked out the code and I'll learn this new assembler as I don't know
it yet. Nice way to learn it I think!
Oh, note that I found on your website a dead link: 
http://www.brielcomputers.com/files/serialmanl.pdf
Thanks to everyone answered!

Thomas

On Wed, 22 Mar 2006 23:16:12 -0500, Vince Briel wrote:

> Why not do like I did with the replica 1 and put your video into a 
> microcontroller? 3 chips will do 40X24 text no problem. The source for the 
> video is available to use for experiments on my web site. Go to the replica 
> 1 pages and select downloads.
> 
> Woz's shift register based video output was simply a choice of "how can I do 
> it cheap". Back then, a lot of decisions Woz made were based on price. Heck, 
> if price weren't an issue, Apples might have been made with Intel 
> processors. Fortunately $300 vs $25 was a big difference so he went with the 
> 6502. The shift registers were the same deal, cheak 1K RAM. The Apple II 
> uses a completely different design, much more complex to build.
> 
> NTSC vs PAL. If you are just going to use black and white, NTSC video will 
> work on most PAL televisions. I personally can't verify that, but I have 
> enough customers that have verified this for me.
> 
> Hope this helps,
> 
> Vince

-- 
Thomas Lecomte    deather.dede@gmail.com    Solaris User & Developer
http://blog.hinyx.info - http://guses.org - http://www.sunwizard.net