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

["Vince Briel" <vbriel@removethisspamcamcast.net>]

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

-- 
Making computers fun again
See the new AltairPC
http://www.brielcomputers.com

"Thomas Lecomte" <deather.dede@no.spam.gmail.com> wrote in message 
pan.2006.03.22.21.03.26.718930@no.spam.gmail.com">news:pan.2006.03.22.21.03.26.718930@no.spam.gmail.com...
> On Wed, 22 Mar 2006 11:00:08 -0800, BLuRry wrote:
> [...]
>
> BLuRry -
>
> Thanks for your answer. However, the link you gave me talked a lot about
> software, whereas I'm more searching for hardware-oriented docs. I would
> like to build a similar video output system for a micro-computer I'm
> designing (just for fun.)
> Thanks,
>
> Thomas
>
> -- 
> Thomas Lecomte    deather.dede@gmail.com    Solaris User & Developer
> http://blog.hinyx.info - http://guses.org - http://www.sunwizard.net
>