Atari 800XL

1 2 3 4 5 6
1 2 3 4 5 6
A
B
C
D
A
B
C
D
Date: 2020-01-15
KiCad E.D.A. kicad (5.1.4-0-10_14)
Rev: 2Size: A4
Id: 4/11
Title: Atari 800XL Schematics
File: video_processing.sch
Sheet: /VIDEO_PROCESSING/
ezContents
Schematics based on Atari 800 XL Service Manual
Includes fixes
Schematics tested on real hardware
67
U20C
4050
W2
GND
11 12
U20E
4050
GND
45
U20B
4050
Y1
3.546894MHz
23
U20A
4050
14 15
U20F
4050
C109
100nF
R114
1.5K
R112
100
VCC
1
VSS
8
U20G
4050
R110
220
R111
27
GND
R113
470
R47
36K
R48
18K
R49
9.1K
R50
4.7K
CR4
1N4148
R109
100
R51
750
1
2
3
Q9
2N3906
1
2
3
Q8
2N3906
GND
L8
1.5µH
C61
100nF
C111
820pF
R73
4.7K
C60
56pF
C59
22pF
Y2
4.433618MHz
GND
R70
10K
R71
470
R69
6.8K
R72
1K
1
2
3
Q6
2N3904
GND
R46
1.6K
R67
75
C58
100nF
R116
51
1
2
3
Q3
2N3904
R52
2K
VCC
14
GND
7
U21C
74LS74
S
10
C
11
D
12
R
13
Q
8
Q
9
U21B 74LS74
R
1
D
2
C
3
S
4
Q
5
Q
6
U21A 74LS74
L7
BEAD
L9
BEAD
R55
75
L6
100µH
C55
100pF
C54
1nF
1
2
3
Q5
2N3904
R97
1K
R64
10K
GND
1
2
3
Q4
2N3904
R68
3K
R66
100
R65
240
R53
100
R56
75
R54
1.2K
R63
4.7K
R62
3.3K
C53
3.9pF
R59
2.2K
GND
R61
1K
1
2
3
Q2
2N3904
R60
1K
R58
6.2K
C52
100pF
RF_MOD_VDO
+5V_D
COLOR
LUM[0..3]
CSYNC
+5V_A
OSC
PAL
+5V_A
J2:LUMIN
+5V_A
J2:VIDEO
+5V_D
+5V_A
LUM3
LUM2
LUM1
LUM0
Note 4
Note 3
Note 2
Notes for domestic units only (NTSC)
1. Change modulator UM1662 (C061658) to modulator UM1652 (CA061619).
2. Change Y1 crystal, C015510, 3.546894MHz to C061090, 3.579545 MHz.
3. Delete all these components.
4. Add jumper W2 for domestic.
MONITOR_CON MONITOR_CON