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68000 LBE Board

MarkD833·RCBUS-68xxx·boards/RC109_LBE_Board/68000_LBE_Board.kicad_pcb

68000 LBE Board layout, top view — open source board by MarkD833
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About the 68000 LBE Board

68000 LBE Board is an open source PCB design by MarkD833, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 101.6 × 53.3 mm, with 34 components from 19 distinct parts.

Other key parts include the 68901P, 68681P, 74LS688 and 74LS138. By type, the board carries 13 connectors, 6 jumpers, 5 capacitors, 4 ICs, 3 resistors and 2 diodes.

It belongs with the retro computing designs in this gallery.

From the project

My Motorola 68000 & 68302 processors (+ SIO, PIO & MFP boards) for the RCBus ecosystem.

The intention of this board is to try and make a 68000 equivalent of Steve Cousins Z80 SC110 board which consists of a Z80 SIO/2 serial chip and a Z80 CTC counter timer chip providing 2 serial ports and 4 8-bit down counters.

By combining an MC68681 DUART (or equivalent) with an MC68901 MFP I managed to achieve a similar board, but with a bit more functionality - mainly due to the MC68901.

68000 LBE Board, from the project README
From the project README

Main components on the 68000 LBE Board

68901P68681P74LS68874LS138

68000 LBE Board bill of materials (BOM)

34 components, 19 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
68901P
U1
1
68681P
U2
1
74LS688
U6
1
74LS138
U7
1
3.6864MHZ
3.6864MHz
X1
1
CONN_02X04_ODD_EVEN
Conn_02x04_Odd_Even
J1
1
CONN_01X04
Conn_01x04
J2
1
RCBUS_80PIN_68000
RCBus_80PIN_68000
J3
1
CONN_02X02_ODD_EVEN
Conn_02x02_Odd_Even
J4
1
CONN_02X06_ODD_EVEN
Conn_02x06_Odd_Even
J5
1
CONN_02X03_ODD_EVEN
Conn_02x03_Odd_Even
J6
1
CONN_02X08_ODD_EVEN
Conn_02x08_Odd_Even
J8
3
CONN_01X08
Conn_01x08
J12, J13, J18
3
CONN_01X06
Conn_01x06
J15, J16, J17
6
SolderJumper
JP1, JP2, JP3, JP4, JP5, JP6
2
LED
D1, D2
5
100N
100n
C2, C4, C5, C9, C10
1
10K
R1
2
1K
R2, R3

68000 LBE Board design files

The KiCad project lives in the MarkD833/RCBUS-68xxx repository on GitHub; these links point at the commit this page was built from.

68000 LBE Board: common questions

How big is the 68000 LBE Board?

The 68000 LBE Board measures 101.6 × 53.3 mm, has 4 copper layers and is 1.6 mm thick.

How many components are on the 68000 LBE Board?

34 components, from 19 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 68000 LBE Board design files?

From the MarkD833/RCBUS-68xxx repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the 68000 LBE Board design in my own project?

It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.

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