MSAP-1
About the MSAP-1 PCB
MSAP-1 is an open source PCB design by mehrantsi, published on GitHub under the MIT license. It is a board, with 112 components from 38 distinct parts.
Other key parts include the LM555, 74HC14, 74HC08, 74LS32 and 74HC161. By type, the board carries 55 ICs, 29 resistors, 7 capacitors, 5 switches, 4 diodes and 3 transistors.
It belongs with the displays & leds designs in this gallery.
From the project
An 8-bit computer
The hand-captured KiCad project for the machine on the bench - the source of truth for the hardware. MSAP-1 rev. B.sch is the schematic, MSAP-1 rev. B.net the netlist, MSAP-1 rev. B.kicadpcb the board file, and PNGs/ holds the plotted sheets shown below. (The simulator can also generate* KiCad netlist/PCB/schematic files from its module registry - useful for modified designs - but for rev.B as built, these files are canonical.)
Main components on the MSAP-1
MSAP-1 bill of materials (BOM)
112 components, 38 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | LM555 | SOIC-8_3.9x4.9mm_P1.27mm | U1, U19 |
| 1 | 74HC14 | U2 | |
| 3 | 74HC08 | U3, U23, U53 | |
| 1 | 74LS32 | U4 | |
| 4 | 74HC161 | U5, U6, U33, U46 | |
| 6 | 74HC245 | U7, U10, U13, U18, U32, U41 | |
| 10 | 74HC173 | U8, U9, U11, U12, U29, U30, U31, U36 +2 | |
| 2 | 74HC86 | U14, U15 | |
| 2 | 74LS283 | U16, U17 | |
| 2 | 74HC107 | U20, U35 | |
| 1 | 74LS139 | U21 | |
| 1 | 74LS273 | U22 | |
| 3 | AT28C16 | DIP-24_W15.24mm | U24, U48, U49 |
| 4 | HDSP-7503 | HDSP-A151 | U25, U26, U27, U28 |
| 2 | 74LHC138 | U34, U47 | |
| 3 | 74HC157 | U38, U39, U44 | |
| 1 | HM6116P | DIP-24_W15.24mm | U40 |
| 2 | 74LS157 | U42, U43 | |
| 2 | 74HC00 | U45, U55 | |
| 2 | 74HC04 | U50, U51 |
Show 18 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 74HC02 | U52 | |
| 1 | 2N2222A | TO-39-3 | Q1 |
| 1 | IRF9540N | TO-220-3_Vertical | Q2 |
| 1 | 2N3906 | TO-92_Inline | Q3 |
| 9 | HDSP-4850_2 | HDSP-4850 | BLUE_LED_BAR1, BLUE_LED_BAR2, BLUE_LED_BAR3, GREEN_LED_BAR1, GREEN_LED_BAR2, RED_LED_BAR1, RED_LED_BAR2, RED_LED_BAR3 +1 |
| 2 | SW_Push | SW1, SW5 | |
| 3 | SW_DPDT_x2 | SW2, SW3, SW4 | |
| 1 | RED_LED | D1 | |
| 3 | GREEN_LED | D2, D3, D4 | |
| 6 | 10nF | C1, C3, C4, C5, C6, C7 | |
| 1 | 100nF | C2 | |
| 1 | RTRIM | R1 | |
| 6 | 1K | R2, R6, R12, R13, R16, R20 | |
| 3 | 100K | R3, R4, R5 | |
| 6 | 10K | R7, R8, R9, R10, R11, R17 | |
| 4 | 220 | R14, R15, R18, R19 | |
| 2 | R_Network_470 | R_Array_SIP9 | RN1, RN6 |
| 7 | R_Network_220 | R_Array_SIP9 | RN2, RN3, RN4, RN5, RN7, RN8, RN9 |
MSAP-1 design files
The KiCad project lives in the mehrantsi/MSAP-1 repository on GitHub; these links point at the commit this page was built from.
- SchematicSchematics/MSAP-1 rev. B.sch
- NetlistSchematics/MSAP-1 rev. B.net
MSAP-1: common questions
How many components are on the MSAP-1?
112 components, from 38 distinct parts. The full bill of materials is listed on this page.
Where can I download the MSAP-1 design files?
From the mehrantsi/MSAP-1 repository on GitHub, which has the schematic and a netlist; the links under Design files point to each one.
Can I use the MSAP-1 design in my own project?
Yes, under the terms of its MIT license, which mehrantsi chose for the repository.
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