On-Line #79 23 апреля 1997

Доработки     Железо

Iron - Additional graphics mode 512x192.

                IRON


(C) V.M.G. Kharkov, Ukraine.

       Additional graphics mode - 512x192


   The proposed mode allows you to position the screen 512 
points in a row or 85 characters with a matrix of 6x8, which 
will add significantly more information and to make more 
comfortable working with text, monochrome graphics terminal 
programs. 


   The numbering of elements in the diagram of the circuit 
given the Pentagon (by VMG) and may not match your scheme. 


                   C1> 2 A0 MUX
 RES> 1 R T 2-D3> 5 A1
           August 5-D15> 11 A2 Y1 4> 9-D41/D42

  D1> 2 D GND> 14 A3 Y2 7> 5-D5
 SEL> 3 9 C Y3> C30 and 1-D7
           June 1-D2> 3 B0 Y3 12> 11-D17
 +5 V> 4 S D1 C1> 6 B1
                  +5 V> 10 B2

       VD1 VD2 9-D15> 13 B3 D1 - 1533TM2
 C29> <> D2 - 1533KP11
                         1 AB

       1K 15 OE D2
 +5 V>> 3-D8
                                     "1-D40

  Diodes - KD522

 (Output>) to signal a withdrawal of its chip-forming
 (Pin <) to apply for withdrawal of a new signal, cutting off 
the old 


   Signal SEL - proinvertirovanny signal output with 10 ID7
(See the wiring diagram of the modem Online'78). Also on top
D38 should be soldered D38 '(1533IR23) all outputs connected to 
the D38, and the inputs connected to respective outputs D37. On 
1-e conclusions D38 and D38 'the signals C3 and 2-D3, and 11-s 
conclusions signals C29 and C3, respectively. Also, the 
findings 9,12,15,16,19 chip D40 should be a 1K resistor to 
submit the land. 


   Further development enabled by setting bit 1 port # EFF7 and
RESET is switched off or reset the same bit. After switching
in memory formation are two areas - # 4000 - # 57FF - even 
bytes on the screen, and # 6000 - # 77FF - odd bytes on the 
screen. Second Screen addressed the same (# C000-# C800 and # 
E000-# E800). 

        Location of bytes on the screen



        4000 6000 4001 6001 4002 6002 ... 401F 601F



                      Scored and added Vic

                     (C) V.M.G. Kharkov, Ukraine
                         phone: 43-47-39