6502 BASIC or Assembler and Intel 8271/WDC 1770 info req'd - test-drb@ccmp.vtda.org

7 Oct 2001

On Oct 7, 22:36, Philip Pemberton wrote:
...
  On 7 Oct 2001 1:36:56 +0100 "Iggy Drougge"
&lt;optimus(a)canit.se&gt; said: 
...
  > Tony mentioned teletext chips a few days ago.
Don't know if those perhaps
...
  are
 > only 8-colour, though. Tony? 
The SAA5050 is certainly only 8-colour (plus attributes like flashing) and
as far as I know so are later teletext chips.

...
  I've got an SAA5050. Anyone know how to use it
without the SAA5020 timing
 generator? 
Take a look at the circuit diagram for a BBC micro; it uses a 6845 for
timing and an SAA5050 to generate the teletext screen mode.

http://bbc.nvg.org/mirror/www.acorn.com/ftp/documents/circuits/

...
  I've also got a Microvitec Cub 653 monitor. TTL
input, composite sync. How
...
  can I get Csync from Vsync and Hsync? 
XOR them together; feed the unbuffered TTL outputs to a 74LS86 or similar,
and buffer the output with a transistor.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York