2 layers150 × 100 mm
Memory loader
TomNisbet/sap-plus
Simple As Possible (SAP) 8-bit computer with a modular PCB design
66 parts11MIT
2 layers102 × 96 mm
Microcode
TomNisbet/sap-plus11Simple As Possible (SAP) 8-bit computer with a modular PCB design
- Size
- 102 × 96 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 40
- Nets
- 108
- Pads
- 286
- Tracks, vias
- 470, 22
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 8.0 (file 20240108)
- Created
- 4 Oct 2024
- Updated
- 24 Feb 2026
Overview
Microcode is an open-source printed circuit board by TomNisbet, from the TomNisbet/sap-plus repository on GitHub, published under the MIT licence. It is a 2-layer board of 102 × 96 mm with 40 parts on 108 nets, routed with 470 tracks and 22 vias.
Its parts include 22 diodes, 5 capacitors, 5 ICs and 5 connectors. It belongs with the retro computing and games boards of this library.
README
schematics/output/README.mdOutput Register Module schematics
created with KiCad 8.0
Changelog
1.0
- Initial version
Parts
40| Qty | Value | Footprint | References |
|---|---|---|---|
| 5 | 0.1uF | Capacitor_THT:C_Disc_D3.0mm_W1.6mm_P2.50mm | C1, C2, C3, C4, C5 |
| 3 | 74LS138 | Package_DIP:DIP-16_W7.62mm | U3, U4, U5 |
| 2 | 28C256 | Package_DIP:DIP-28_W15.24mm_Socket | U1, U2 |
| 2 | Bus | Connector_PinHeader_2.54mm:PinHeader_1x40_P2.54mm_Vertical | J1, J2 |
| 1 | BI | LED_THT:LED_D3.0mm | D19 |
| 1 | CX | LED_THT:LED_D3.0mm | D18 |
| 1 | FL | LED_THT:LED_D3.0mm | D20 |
| 1 | N | LED_THT:LED_D3.0mm | D21 |
| 1 | PI | LED_THT:LED_D3.0mm | D22 |
| 1 | R_BLU | Resistor_THT:R_Array_SIP9 | RN3 |
| 1 | R_GRN | Resistor_THT:R_Array_SIP9 | RN2 |
| 1 | R_RED | Resistor_THT:R_Array_SIP10 | RN1 |
| 1 | SC | LED_THT:LED_D3.0mm | D17 |
| 1 | to Instruction Register | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J6 |
| 1 | to Loader | Connector_PinHeader_2.54mm:PinHeader_1x08_P2.54mm_Vertical | J4 |
| 1 | to Step Counter | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J5 |
| 1 | ~{RA} | LED_THT:LED_D3.0mm | D10 |
| 1 | ~{RB} | LED_THT:LED_D3.0mm | D11 |
| 1 | ~{RD} | LED_THT:LED_D3.0mm | D16 |
| 1 | ~{RL} | LED_THT:LED_D3.0mm | D12 |
| 1 | ~{RP} | LED_THT:LED_D3.0mm | D13 |
| 1 | ~{RR} | LED_THT:LED_D3.0mm | D14 |
| 1 | ~{RS} | LED_THT:LED_D3.0mm | D15 |
| 1 | ~{WA} | LED_THT:LED_D3.0mm | D1 |
| 1 | ~{WB} | LED_THT:LED_D3.0mm | D2 |
| 1 | ~{WD} | LED_THT:LED_D3.0mm | D7 |
| 1 | ~{WI} | LED_THT:LED_D3.0mm | D9 |
| 1 | ~{WM} | LED_THT:LED_D3.0mm | D8 |
| 1 | ~{WO} | LED_THT:LED_D3.0mm | D3 |
| 1 | ~{WP} | LED_THT:LED_D3.0mm | D4 |
| 1 | ~{WR} | LED_THT:LED_D3.0mm | D5 |
| 1 | ~{WS} | LED_THT:LED_D3.0mm | D6 |
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Questions
How big is the Microcode PCB?
It measures 102 × 96 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Microcode use?
40 parts. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Microcode KiCad files?
From the TomNisbet/sap-plus repository on GitHub, at the commit this page was made from: the board is schematics/microcode/microcode.kicad_pcb and its schematic schematics/ab-register/ab-register.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Microcode design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).