KrNews #01 04 марта 1998

toilers - A hardware multicolor.

No, but I do not go away :-)
I immediately engrossed in ferrum, which gave
Maxx, and decided to push the idea too:)
Few who read X-RAY # 2, and not all
drew attention to the simple oooochen
apiece for the "hardware multicolor"
(Screen, 12288, High_Attr_Scr, HAS, bytes
attributes to a byte of graphics, etc).


  1.Programmnaya model.
Structure charts old.
# 4000 Graphics (6 kb);
# 6000-attributes (6 kb).


  2.Theory.
There is a comp multiplexer, which
entangles addresses for read cycle
Attribute video controller. So,
doing so byaku that the 12288 mode
He always missed addresses grafikovyh
counters (hang on the +5 V / Land switching leg). entot A 
changeover signalets throw at A13 RAM, more RAM to the 
multiplexer (possibly via an inverter) For graphics it should 
be 0, and for attributes 1 (# 4000 / # 6000) 


  3.Praktika.
I've been doing this thing in his Krasnodar, but
right now, do not remember exactly what and where, and because
complex in CHIP'a and see also I can not.
If anyone interested, I dig deeper into
companies and schemes, and tell me more practice (moral: wear 
their designs) 


                              10.03.97