RAM128
About the RAM128 PCB
RAM128 is an open source PCB design by garrettsworkshop, published on GitHub under the Custom license license. It is a 4-layer board measuring 74.2 × 42.7 mm, with 51 components from 16 distinct parts.
Other key parts include the 621024, 74HCT245PW, 74HCT273PW, 74AHCT1G32GW and 74AHCT08PW. By type, the board carries 20 ICs, 18 capacitors, 6 resistors, 1 connector and 1 switch.
From the project
128 kB Saturn 128k-compatible RAM expansion card for Apple II
Main components on the RAM128
RAM128 bill of materials (BOM)
51 components, 16 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 621024 | SOP-32_450mil | U1 |
| 1 | 74HCT245PW | TSSOP-20_4.4x6.5mm_P0.65mm | U2 |
| 2 | 74HCT273PW | TSSOP-20_4.4x6.5mm_P0.65mm | U3, U4 |
| 2 | 74AHCT1G32GW | SOT-353 | U5, U18 |
| 3 | 74AHCT08PW | TSSOP-14_4.4x5mm_P0.65mm | U6, U8, U9 |
| 2 | 74AHCT32PW | TSSOP-14_4.4x5mm_P0.65mm | U7, U10 |
| 1 | 74AHCT1G126GW | SOT-353 | U11 |
| 8 | 74AHCT1G04GW | SOT-353 | U12, U13, U14, U15, U16, U17, U19, U20 |
| 1 | AppleIIBus | AppleIIBus_Edge | J1 |
| 5 | — | PasteHole_1.152mm_NPTH | H1, H2, H3, H4, H5 |
| 1 | DMA/ROM | SW_DIP_SPSTx02_Slide_DSHP02TS_P1.27mm | SW1 |
| 2 | 10U 10u | C_0805 | C1, C16 |
| 16 | 2U2 2u2 | C_0603 | C2, C3, C4, C5, C6, C7, C8, C9 +8 |
| 4 | 22K 22k | R_0805 | R1, R2, R3, R4 |
| 1 | 0 | R_0805 | R5 |
| 1 | DNP | R_0805 | R6 |
RAM128 design files
The KiCad project lives in the garrettsworkshop/RAM128 repository on GitHub; these links point at the commit this page was built from.
- LayoutRAM128.kicad_pcb
- SchematicRAM128.kicad_sch
- BOMgerber/RAM128-BOM.csv
RAM128: common questions
How big is the RAM128 PCB?
The RAM128 measures 74.2 × 42.7 mm, has 4 copper layers and is 1.6108 mm thick.
How many components are on the RAM128?
51 components, from 16 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the RAM128 design files?
From the garrettsworkshop/RAM128 repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the RAM128 design in my own project?
It is published under Custom license, which limits how it may be reused; read the license before building on it.