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Backup1

danwerner21·Dragon64·Dragon64Board/backup1.kicad_pcb

Backup1 PCB layout, top view — open source board by danwerner21
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About the Backup1 PCB

Backup1 is an open source PCB design by danwerner21, published on GitHub. It is a 2-layer board measuring 333.2 × 205.9 mm, with 218 components from 101 distinct parts.

Other key parts include the 74LS244, LM393, 4050, 6821 and 4529. By type, the board carries 78 capacitors, 68 resistors, 36 ICs, 12 diodes, 5 connectors and 4 inductors.

From the project

A clone board for the Dragon64 and Tandy Color Computer

The schematic capture is complete, and I've done one full verification pass. But I'm still making no promises about correctness! I've uploaded a PDF for those without access to KiCad.

A lot of the PCB positioning is now correct - at least to the nearest mm, usually better - and everything's pointing in a sensible direction with the exception of some diodes: Dragon Data ensured they always had the cathode to the right, presumably to avoid manufacturing confusion, and I've preserved that decision.

Main components on the Backup1

74LS244LM393405068214529406968476551416474LS27327C12874LS0074LS02MC6809E688374LS138MAX232MC137274LS0727C6474LS0474LS13974LS06N74LS174

Backup1 bill of materials (BOM)

218 components, 101 distinct parts — part numbers from the project's BOM.

QtyPartRefs
2
74LS244
IC1, IC25
1
LM393
IC2
1
4050
IC4
2
6821
IC5, IC8
1
4529
IC6
1
4069
IC7
1
6847
IC10
1
6551
IC11
8
4164
IC15, IC16, IC21, IC22, IC26, IC27, IC32, IC33
1
74LS273
IC20
1
27C128
IC34
2
74LS00
IC35, U3
1
74LS02
IC36
1
27C128
IC37
1
MC6809E
IC38
1
6883
IC39
1
74LS138
IC40
1
MAX232
U1
1
MC1372
U2
1
74LS07
U4
Show 81 more
QtyPartRefs
1
27C64
U5
1
74LS04
U6
1
74LS139
U7
1
74LS06N
U8
1
74LS174
U9
1
WD2797
U10
1
14.31818MHZ
14.31818Mhz
X1
1
4MHZ
4Mhz
X3
1
1.8432MHZ
1.8432Mhz
Y2
1
ATX
J1
1
TTL Serial Connector
J2
1
composite on luma
J3
1
DISK ROM ENABLE
J5
1
Floppy Interface
J6
1
~
LK1
1
Keyboard
PL1
1
Printer
PL2
1
Joystick R
PL3
1
Cassette
PL4
1
Joystick L
PL5
1
Power/Video
PL6
1
Cartridge
PL9
1
SPDT
RLA1
1
10K-READ
10K-Read
RV1
1
10K-READ
10K-Write
RV2
1
BC182L
TR1
5
1N914
D1, D8, D12, D13, D14
2
BZX 61
D2, D3
1
1N4002
D4
4
1N4148
D5, D6, D7, D11
4
3.3U
3.3u
L1, L2, L3, L4
38
.01u
C1, C7, C11, C12, C18, C20, C21, C22 +30
10
.1u
C2, C4, C5, C27, C28, C59, C60, C61 +2
1
.002u
C3
5
.02u
C6, C13, C14, C15, C16
2
1u
C8, C48
4
1u
C9, C24, C25, C54
1
10U
10u
C10
1
22P
22p
C17
1
10UF
10uf
C19
1
10uf 16v
C23
2
100UF
100uf
C26, C63
1
56PF
56pf
C30
2
0.1uf
C33, C49
1
25UF
25uf
C35
1
47UF
47uf
C36
1
100PF
100pf
C37
1
470PF
470pf
C44
2
4.7UF
4.7uf
C58, C64
1
47P
47p
C67
1
8-70PF
8-70pf
C77
1
10NF
10nf
C78
1
100R
R1
11
4K7
R2, R14, R24, R25, R65, R66, R67, R68 +3
1
470R
R3
1
220R
R4
1
8K2
R5
3
470
R6, R31, R85
2
390
R7, R12
1
5.6K
5.6k
R8
6
10K
R9, R11, R15, R16, R26, R28
6
1K
R10, R18, R27, R41, R44, R64
1
820
R13
3
100K
R17, R32, R42
1
6K8
R19
2
56K
R20, R21
1
1M5
R22
1
15K
R23
1
10M
R29
1
420
R30
1
160K
R33
1
330K
R34
1
80K6 1%
R35
1
40K2 1%
R36
1
20K 1%
R37
1
10K 1%
R38
1
68K
R39
1
33K
R40
1
750
R43
4
150
R45, R46, R47, R48
11
22R
R73, R74, R75, R76, R77, R78, R79, R80 +3

Backup1 design files

The KiCad project lives in the danwerner21/Dragon64 repository on GitHub; these links point at the commit this page was built from.

Backup1: common questions

How big is the Backup1 PCB?

The Backup1 measures 333.2 × 205.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Backup1?

218 components, from 101 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Backup1 design files?

From the danwerner21/Dragon64 repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.

Can I use the Backup1 design in my own project?

The repository has no license, so all rights stay with danwerner21. Use it as a reference, and ask the author before reusing the design.

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