4 layers97.8 × 25 mm
4 layers97.8 × 25 mm
MacIIROMSIMM
garrettsworkshop/MacIIROMSIMM21ROM SIMM for Apple Macintosh II-series and Macintosh SE/30 machines
- Size
- 97.8 × 25 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 42
- Nets
- 125
- Pads
- 360
- Tracks, vias
- 1,193, 352
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 26 Jan 2020
- Updated
- 27 Apr 2025
Overview
MacIIROMSIMM is an open-source printed circuit board by garrettsworkshop, from the garrettsworkshop/MacIIROMSIMM repository on GitHub. It is a 4-layer board of 97.8 × 25 mm with 42 parts on 125 nets, routed with 1,193 tracks and 352 vias.
It is built around the 74LVC245APW, 74LVC1G02GW and XC6206P332MR. Its parts include 15 capacitors, 11 ICs, 4 resistors, 1 connector and 1 switch.
Main components
3
74LVC245APW
TSSOP-20-40℃~+125℃ 8 Level translator Power-off protection、Output enable high-impedance TTL、CMOS Tri-State TSSOP-20 Buffers, Drivers, Receivers, Transceivers ROHSMDDBuffers, Drivers, Receivers, Transceivers
74LVC1G02GW
SOT-353-5-40℃~+125℃ 1 1.2V、1.9V、2.2V、2.3V、3.8V 1.65V~5.5V 1.7V、2V 2 24mA 24mA 300mV、400mV、450mV、550mV、550mV 4uA 700mV、800mV 74LVC NOR Gate SOT-353-5 Logic Gates ROHSNexperiaLogic Gates
XC6206P332MR
SOT-23-40℃~+85℃@(Ta) 1 1uA 200mA 3.3V 6V Fixed Over Current Protection Positive SOT-23-3L Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTorex SemiconductorVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
Parts
42| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 2u2 | stdpads:C_0603 | C1, C2, C3, C4, C5, C6, C7, C8, C9, C10, C11, C12, C13, C14, C15 |
| 7 | 74LVC245APW | stdpads:TSSOP-20_4.4x6.5mm_P0.65mm | U3, U4, U5, U6, U7, U9, U10 |
| 4 | stdpads:PasteHole_1.152mm_NPTH | H1, H2, H3, H4 | |
| 4 | Fiducial | stdpads:Fiducial | FID1, FID2, FID3, FID4 |
| 3 | 3k3 | stdpads:R_0603 | R1, R2, R4 |
| 2 | LOGO | LOGO | G***, G*** |
| 2 | MX29LV640 | stdpads:TSOP-I-48_18.4x12mm_P0.5mm | U1, U2 |
| 1 | 100 | stdpads:R_0603 | R3 |
| 1 | 74LVC1G02GW | stdpads:SOT-353 | U12 |
| 1 | ROM | stdpads:MacIIROMSIMM_Edge | J1 |
| 1 | ROM Sel. | stdpads:SW_DIP_SPSTx03_Slide_DSHP03TS_P1.27mm | SW1 |
| 1 | XC6206P332MR | stdpads:SOT-23 | U11 |
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Questions
How big is the MacIIROMSIMM PCB?
It measures 97.8 × 25 mm and has 4 copper layers, 1.61 mm thick.
What parts does the MacIIROMSIMM use?
42 parts, built around the 74LVC245APW, 74LVC1G02GW and XC6206P332MR. 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 MacIIROMSIMM KiCad files?
From the garrettsworkshop/MacIIROMSIMM repository on GitHub, at the commit this page was made from: the board is MacIIROMSIMM.kicad_pcb and its schematic MacIIROMSIMM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the MacIIROMSIMM design in my own project?
Its repository states no licence, so its author keeps all rights: ask garrettsworkshop before reusing the design.