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68000 SIO BOARD

MarkD833·RCBUS-68xxx·boards/RC103_SIO_Board/68000_SIO_BOARD.kicad_pcb

68000 SIO BOARD layout, top view — open source board by MarkD833
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About the 68000 SIO BOARD

68000 SIO 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 33 components from 15 distinct parts.

Other key parts include the 74LS138, 68681P and 74LS688. By type, the board carries 14 connectors, 8 jumpers, 5 capacitors, 4 ICs, 1 crystal and 1 resistor.

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 base address of each DUART is determined by the placement of a jumper between adjacent pins on J1 & J9 (DUART A) and J1 & J11 (DUART B).

The jumper J14 can also be configured to route the baud rate generator clock to the CLOCK2 pin on the RCBus-80 connector.

Note that there is a current limit of 500mA - imposed by the host system USB hardware - when the system is powered this way. It is relatively easy to exceed this limit once several boards are in use and I recommend that the system be powered from an external 5V supply connected to the RCBus backplane instead.

68000 SIO BOARD, from the project README
From the project README

Main components on the 68000 SIO BOARD

74LS13868681P74LS688

68000 SIO BOARD bill of materials (BOM)

33 components, 15 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
74LS138
U1
2
68681P
U2, U3
1
74LS688
U4
1
3.6864MHZ
CXO_DIP8
X1
3
CONN_01X08
Conn_01x08
J1, J9, J11
4
CONN_01X06
Conn_01x06
J2, J5, J7, J8
2
CONN_01X03
Conn_01x03
J3, J6
1
CONN_02X10_ODD_EVEN
Conn_02x10_Odd_Even
J4
1
CONN_02X08_ODD_EVEN
Conn_02x08_Odd_Even
J10
1
CONN_02X04_ODD_EVEN
Conn_02x04_Odd_Even
J12
1
CONN_02X02_ODD_EVEN
Conn_02x02_Odd_Even
J14
1
RCBUS_80PIN_68000
RCBus_80PIN_68000
J15
8
SolderJumper
JP1, JP2, JP3, JP4, JP5, JP6, JP7, JP8
5
100N
100n
C1, C2, C3, C4, C7
1
10K
R1

68000 SIO 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 SIO BOARD: common questions

How big is the 68000 SIO BOARD?

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

How many components are on the 68000 SIO BOARD?

33 components, from 15 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 SIO 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 SIO 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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