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
