SAP-Plus Program Counter and Stack Pointer

TomNisbet·sap-plus·schematics/pc-sp/pc-sp.kicad_pcb

SAP-Plus Program Counter and Stack Pointer PCB layout, top view — open source board by TomNisbet

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About the SAP-Plus Program Counter and Stack Pointer PCB

SAP-Plus Program Counter and Stack Pointer 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 50 components from 34 distinct parts.

Other key parts include the 74LS245, 74LS161, 74LS193, 74LS00 and 74LS32. By type, the board carries 23 diodes, 9 resistors, 8 ICs, 8 capacitors and 2 connectors.

From the project

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

Add PI LED for Program Counter Fix mismatched datasheets references on schematic for U4

Main components on the SAP-Plus Program Counter and Stack Pointer

74LS245 74LS161 74LS193 74LS00 74LS32

SAP-Plus Program Counter and Stack Pointer bill of materials (BOM)

50 components, 34 distinct parts.

Qty	Part	Footprint	Refs
2	74LS245	DIP-20_W7.62mm	U1, U4
2	74LS161	DIP-16_W7.62mm	U2, U3
2	74LS193	DIP-16_W7.62mm	U5, U6
1	74LS00	DIP-14_W7.62mm	U7
1	74LS32	DIP-14_W7.62mm	U8
2	Bus	PinHeader_1x40_P2.54mm_Vertical	J1, J2
1	P0	LED_D3.0mm	D1
1	P1	LED_D3.0mm	D2
1	P2	LED_D3.0mm	D3
1	P3	LED_D3.0mm	D4
1	P4	LED_D3.0mm	D5
1	P5	LED_D3.0mm	D6
1	P6	LED_D3.0mm	D7
1	P7	LED_D3.0mm	D8
1	S0	LED_D3.0mm	D9
1	S1	LED_D3.0mm	D10
1	S2	LED_D3.0mm	D11
1	S3	LED_D3.0mm	D12
1	S4	LED_D3.0mm	D13
1	S5	LED_D3.0mm	D14

Show 14 more

Qty	Part	Footprint	Refs
1	S6	LED_D3.0mm	D15
1	S7	LED_D3.0mm	D16
2	WRITE	LED_D3.0mm	D17, D19
2	READ	LED_D3.0mm	D18, D20
1	DN	LED_D3.0mm	D21
1	UP	LED_D3.0mm	D22
1	PI	LED_D3.0mm	D23
8	0.1uF	C_Disc_D3.0mm_W1.6mm_P2.50mm	C1, C2, C3, C4, C5, C6, C7, C8
1	R-BLU	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R1
2	R-RED	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R17, R19
2	R-GRN	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R18, R20
2	R-ORG	R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal	R21, R22
1	R-GRN	R_Array_SIP9	RN1
1	R-RED	R_Array_SIP9	RN2

SAP-Plus Program Counter and Stack Pointer 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.

Layoutschematics/pc-sp/pc-sp.kicad_pcb
Schematicschematics/pc-sp/pc-sp.kicad_sch

SAP-Plus Program Counter and Stack Pointer: common questions

How big is the SAP-Plus Program Counter and Stack Pointer PCB?

The SAP-Plus Program Counter and Stack Pointer measures 102 × 96 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the SAP-Plus Program Counter and Stack Pointer?

50 components, from 34 distinct parts. The full bill of materials is listed on this page.

Where can I download the SAP-Plus Program Counter and Stack Pointer 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 Program Counter and Stack Pointer design in my own project?

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

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