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BeebSCSI

Domesday86·BeebSCSI·BeebSCSI_KiCAD/BeebSCSI_Board/BeebSCSI.kicad_pcb

BeebSCSI PCB layout, top view — open source AVR/Arduino board by Domesday86

About the BeebSCSI PCB

BeebSCSI is an open source AVR/Arduino PCB design by Domesday86, published on GitHub. It is a 2-layer board measuring 65.5 × 50.8 mm, with 47 components from 23 distinct parts.

Its main chip is the AT90USB1287, from the AVR/Arduino family. Other key parts include the LM1117-3.3, XC9572XL and 74AHC125S. By type, the board carries 20 resistors, 14 capacitors, 6 connectors, 4 ICs, 1 transistor and 1 crystal.

From the project

SCSI-1 Emulator for 8-bit Acorn computers such as the BBC Master and BBC Model B

BeebSCSI is a Micro SD Card based SCSI storage emulation for the Acorn 8-bit range of microcomputers including the Acorn BBC Model B (with ADFS) and the BBC Master 128.

Please see the project wiki for detailed documentation on BeebSCSI

The project is divided into several sections:

BeebSCSI_AVR - This is the AT90USB1287 microcontroller firmware (written in GCC)

BeebSCSI_CPLD - This is the Xilinx XC9572XL CPLD firmware (written in ISE Verilog)

Main components on the BeebSCSI

AT90USB1287LM1117-3.3XC9572XL74AHC125S

BeebSCSI bill of materials (BOM)

47 components, 23 distinct parts.

QtyPartRefs
1
AT90USB1287
IC1
1
LM1117-3.3
U1
1
XC9572XL
U2
1
74AHC125S
U3
1
ZXMP3A13FTA
Q1
1
16MHz Crystal
Y1
1
5V Power
J1
1
BBC 1 MHz Bus
J2
1
JTAG-IDC
J3
1
TTL Serial
J5
1
Micro_SD_Card_Det
J6
1
USB
J7
1
Status LED
D1
2
10uF Tant
C1, C2
8
100nF
C3, C4, C5, C6, C7, C8, C9, C12
2
22pF
C10, C11
2
1uF
C13, C14
1
2K2
R1
1
470R
R2
2
10K
R3, R10
Show 3 more
QtyPartRefs
4
47K
R4, R5, R6, R7
2
22R
R8, R9
10
2K2
RN1, RN2, RN3, RN4, RN5, RN6, RN7, RN8 +2

BeebSCSI design files

The KiCad project lives in the Domesday86/BeebSCSI repository on GitHub; these links point at the commit this page was built from.

BeebSCSI: common questions

What microcontroller does the BeebSCSI use?

The BeebSCSI is built around the AT90USB1287, from the AVR/Arduino family.

How big is the BeebSCSI PCB?

The BeebSCSI measures 65.5 × 50.8 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the BeebSCSI?

47 components, from 23 distinct parts. The full bill of materials is listed on this page.

Where can I download the BeebSCSI design files?

From the Domesday86/BeebSCSI repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the BeebSCSI design in my own project?

The repository has no license, so all rights stay with Domesday86. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the BeebSCSI without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug AVR/Arduino firmware against it before you order a PCB.

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