[ColorForth] The Cheap Video Cookbook

[Mark Slicker <maslicke@xxxxxxxxxxx>]

On Wed, 12 Dec 2001, Kurt B. Kaiser wrote:

> Hi Mark,
> There are two "collectible" copies of this book on Amazon. Basically how to bit
> bang a video interface.  I can't remember if he used color, probably not.
> Probably just text based monochrome. But worth a read for the techniques, and
> we've got a lot more power than an 8 bit 1978 micro =)
>

Very much so!
 
> The Sinclair ZX81 was interesting because it used a Z80 (and very little else)
> to drive an NTSC interface. The schematic was published. As I recall, the ZX81
> was very busy with the horizontal drive and actually did all its BASIC
> computing during the vertical retrace.
>

There is a good a amount of time in the vertical retrace, that's probably
a good place do pre-processing. 

> http://www.amazon.com/exec/obidos/ASIN/0672217236/qid=1008199301/sr=1-4/ref=sr_1_10_4/102-1416715-5016908
> 

Thanks for the links, I'll get either one or both books, if I find some
good methods applicable to the 25x I'll report back to the list.

Mark


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