CBM-II-MultiROM
About the CBM-II-MultiROM PCB
CBM-II-MultiROM is an open source PCB design by sjgray, published on GitHub. It is a 2-layer board measuring 41.8 × 19.1 mm, with 5 components from 5 distinct parts.
Other key parts include the 2364 and 27C020. By type, the board carries 2 ICs, 2 resistors and 1 switch.
From the project
2364 to W27C020 plcc eeprom 32 banks
CBM-II Multi-ROM Adapter =======================
This is an adapter for CBM-II machines. All ROM sockets including the character ROM will take an 8K 2364 Masked ROM. 2364 ROMs are also used in other CBM products produced around the same time. This adapter contains a PLCC socket that can hold a W27C020 EEPROM of 256K. These EEPROMS are still available and very inexpensive so it doesn't matter if you don't fill it up. It can erased and re-programmed over and over if needed.
Main components on the CBM-II-MultiROM
CBM-II-MultiROM bill of materials (BOM)
5 components, 5 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | 2364 | DIP-24_W15.24mm_Socket | U2 |
| 1 | 27C020 | PLCC-32_THT-Socket | U4 |
| 1 | SW_DIP_x06 | SW_DIP_SPSTx06_Slide_6.7x16.8mm_W7.62mm_P2.54mm_LowProfile | SW1 |
| 1 | 4K7 | R_Axial_DIN0204_L3.6mm_D1.6mm_P5.08mm_Horizontal | R1 |
| 1 | 4K7 | R_Array_SIP5 | RN1 |
CBM-II-MultiROM design files
The KiCad project lives in the sjgray/CBM-II-MultiROM repository on GitHub; these links point at the commit this page was built from.
- LayoutCBM2-MultiROM.kicad_pcb
- SchematicCBM2-MultiROM.kicad_sch
CBM-II-MultiROM: common questions
How big is the CBM-II-MultiROM PCB?
The CBM-II-MultiROM measures 41.8 × 19.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the CBM-II-MultiROM?
5 components, from 5 distinct parts. The full bill of materials is listed on this page.
Where can I download the CBM-II-MultiROM design files?
From the sjgray/CBM-II-MultiROM repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the CBM-II-MultiROM design in my own project?
The repository has no license, so all rights stay with sjgray. Use it as a reference, and ask the author before reusing the design.