Original TV Typewriter

From: Scott Stevens <chenmel_at_earthlink.net>
Date: Sat Jan 15 20:41:59 2005

On Sat, 15 Jan 2005 14:50:00 -0800
"Michael Holley" <swtpc6800_at_comcast.net> wrote:

> I have added more information on Don Lancaster's original TV
> Typewriter to my web site.
> http://www.swtpc.com/mholley/RadioElectronics/TV_Typewriter.htm
> I have put up the complete set of plans, the 24 page booklet you had
> to send away for.
> http://www.swtpc.com/mholley/TV_Typewriter/TV_Typewriter_Reprint.htm
> I have 300 dpi and 600 dpi tiff files but they are very large. Ask if
> you want them.
> There is a real copy on eBay now with a starting price of 1.95. (Item
> number: 5744207804.) I already have two copies so I won't be bidding.
> I also have some pictures of a real TV Typewriter build by Bob
> Rethemeyer. http://www.swtpc.com/mholley/TV_Typewriter/Rethemeyer.htm
> Michael Holley
> www.swtpc.com/mholley
I have Lancaster's 'Cheap Video Cookbook' in my bookcase, which is a
fascinating book, taking low-level cheats and tweaks to an extreme, to
get video output on the first generation hobby computers. I.e. the
'upstream tap' and SCAN micoinstruction'. Stealing signals off the
address buss, using side effects to generate 'fast enough' signals.

Chapter 4 has plans for the TVT 6-5/8, a 7 i.c. video interface as
'hackerish' as Wozniak's first Disk Interface for the Apple.

The stuff in the Cheap Video Cookbook always involves 'cheating' video
out of your system using machine language and tapping into the address
buss, etc. Writing software with 'scope probe in hand, all that good

Received on Sat Jan 15 2005 - 20:41:59 GMT

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