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SAP-Plus Microcode

TomNisbet·sap-plus·schematics/microcode/microcode.kicad_pcb

SAP-Plus Microcode PCB layout, top view — open source board by TomNisbet
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About the SAP-Plus Microcode PCB

SAP-Plus Microcode is an open source PCB design by TomNisbet, published on GitHub under the MIT license. It is a 2-layer board measuring 102 × 96 mm, with 40 components from 32 distinct parts.

Other key parts include the 28C256 and 74LS138. By type, the board carries 22 diodes, 5 ICs, 5 connectors, 5 capacitors and 3 resistors.

From the project

Simple As Possible (SAP) 8-bit computer with a modular PCB design

* Add labels module interconnect headers

Main components on the SAP-Plus Microcode

28C25674LS138

SAP-Plus Microcode bill of materials (BOM)

40 components, 32 distinct parts.

QtyPartRefs
2
28C256
U1, U2
3
74LS138
U3, U4, U5
2
Bus
J1, J2
1
to Loader
J4
1
to Step Counter
J5
1
to Instruction Register
J6
1
~{WA}
D1
1
~{WB}
D2
1
~{WO}
D3
1
~{WP}
D4
1
~{WR}
D5
1
~{WS}
D6
1
~{WD}
D7
1
~{WM}
D8
1
~{WI}
D9
1
~{RA}
D10
1
~{RB}
D11
1
~{RL}
D12
1
~{RP}
D13
1
~{RR}
D14
Show 12 more
QtyPartRefs
1
~{RS}
D15
1
~{RD}
D16
1
SC
D17
1
CX
D18
1
BI
D19
1
FL
D20
1
N
D21
1
PI
D22
5
0.1uF
C1, C2, C3, C4, C5
1
R_RED
RN1
1
R_GRN
RN2
1
R_BLU
RN3

SAP-Plus Microcode design files

The KiCad project lives in the TomNisbet/sap-plus repository on GitHub; these links point at the commit this page was built from.

SAP-Plus Microcode: common questions

How big is the SAP-Plus Microcode PCB?

The SAP-Plus Microcode measures 102 × 96 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SAP-Plus Microcode?

40 components, from 32 distinct parts. The full bill of materials is listed on this page.

Where can I download the SAP-Plus Microcode design files?

From the TomNisbet/sap-plus repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the SAP-Plus Microcode design in my own project?

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

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