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Jupiter-II-Expansion

ricaflops·Jupiter-II-Expansion

Jupiter-II-Expansion PCB layout, top view — open source board by ricaflops

About the Jupiter-II-Expansion PCB

Jupiter-II-Expansion is an open source PCB design by ricaflops, published on GitHub under the MIT license. It is a 2-layer board measuring 164.5 × 71.8 mm, with 95 components from 33 distinct parts.

Other key parts include the GAL22V10, 27C128, 628128, AY-3-8910 and 16C450. By type, the board carries 59 resistors, 14 capacitors, 9 ICs, 6 connectors, 3 transistors and 2 crystals.

It belongs with the retro computing designs in this gallery.

From the project

Expansion board for Jupiter-II computer

Note: use Space key to abort communication if needed

Avoid transfering to/from video RAM using video circuit priority addressing. That prevents transfer speeds above 1200 bauds. - Video RAM from $2400 to $27FF. Use mirror addressing $2000 to $23FF instead (CPU priority). - Character Genrator RAM from $2C00 to $2FFF. Use mirror addressing $2800 to $2BFF instead (CPU priority).

Jupiter-II-Expansion, from the project README
From the project README

Main components on the Jupiter-II-Expansion

GAL22V1027C128628128AY-3-891016C450611674LS25774LS574

Jupiter-II-Expansion bill of materials (BOM)

95 components, 33 distinct parts.

QtyPartRefs
1
GAL22V10
U1
1
27C128
U2
1
628128
U3
1
AY-3-8910
U4
1
16C450
U5
1
6116
U6
2
74LS257
U7, U9
1
74LS574
U8
3
BC817
Q1, Q2, Q3
1
CXO_DIP14 3.6864 MHz
X1
1
3.6864 MHz
Y1
1
Conn_02x25_Odd_Even
J1
1
Conn_02x25_Odd_Even
J2
1
Conn_01x10
J3
1
Conn_01x03
J4
1
Conn_01x07
J6
1
Conn_02x15_Odd_Even
J7
2
1N914
D1, D2
1
47p
C1
1
22p
C2
Show 13 more
QtyPartRefs
2
10u
C3, C6
2
33p
C4, C5
8
100n
C7, C8, C9, C10, C11, C12, C13, C14
8
4k7
R1, R2, R3, R4, R55, R56, R58, R59
1
1k5
R5
1
1M
R6
6
10k
R7, R9, R10, R12, R53, R54
2
470
R8, R13
6
1k
R11, R14, R15, R20, R25, R47
14
2k2
R16, R21, R26, R27, R28, R29, R38, R39 +6
6
3k3
R17, R18, R22, R23, R40, R41
3
75
R19, R24, R42
12
1k2
R30, R31, R32, R33, R34, R35, R36, R37 +4

Jupiter-II-Expansion design files

The KiCad project lives in the ricaflops/Jupiter-II-Expansion repository on GitHub; these links point at the commit this page was built from.

Jupiter-II-Expansion: common questions

How big is the Jupiter-II-Expansion PCB?

The Jupiter-II-Expansion measures 164.5 × 71.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Jupiter-II-Expansion?

95 components, from 33 distinct parts. The full bill of materials is listed on this page.

Where can I download the Jupiter-II-Expansion design files?

From the ricaflops/Jupiter-II-Expansion repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Jupiter-II-Expansion design in my own project?

Yes, under the terms of its MIT license, which ricaflops chose for the repository.

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