SIMM-SWITCH
About the SIMM-SWITCH PCB
SIMM-SWITCH is an open source PCB design by herzmx, published on GitHub under the CC-BY-NC-4.0 license. It is a 2-layer board measuring 122.5 × 36.6 mm, with 7 components from 3 distinct parts.
By type, the board carries 6 connectors and 1 switch.
From the project
CPS3 NOS is an alternative to the original SIMMs for CPS3; currently, the available options include clone SIMMs with old-stock FLASH memory and Ultra SIMMs by DS.
CPS3 NOS is an alternative to the original SIMMs for CPS3; currently, the available options include clone SIMMs with old-stock FLASH memory and Ultra SIMMs by DS.
The project shares similarities with UltraSIMM but is not based on it. Instead, it is a new implementation built using publicly available pinouts and CPS3 schematics from FPGA projects.
The initial design aimed to use SPANSION NOR FLASH as the main memory, but this proved unfeasible due to speed limitations causing significant instability. As a result, MICRON NOR FLASH was used instead. While this is the same type of memory used…
SIMM-SWITCH bill of materials (BOM)
7 components, 3 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 5 | Conn_02x03_Odd_Even | PinHeader_2x03_P1.27mm_Vertical_SMD | J1, J3, J4, J5, J6 |
| 1 | CONN_02X03_ODD_EVEN Conn_02x03_Odd_Even | PinHeader_2x03_P1.27mm_Vertical_SMD | J2 |
| 1 | SW_DIP_x03 | SW-SMD_6P-L8.6-W6.2-P2.54-LS9.8 | SW1 |
SIMM-SWITCH design files
The KiCad project lives in the herzmx/cps3-nos repository on GitHub; these links point at the commit this page was built from.
SIMM-SWITCH: common questions
How big is the SIMM-SWITCH PCB?
The SIMM-SWITCH measures 122.5 × 36.6 mm, has 2 copper layers and is 1.2 mm thick.
How many components are on the SIMM-SWITCH?
7 components, from 3 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 SIMM-SWITCH design files?
From the herzmx/cps3-nos 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 SIMM-SWITCH design in my own project?
It is published under CC-BY-NC-4.0, which limits how it may be reused; read the license before building on it.
