Rambow
About the Rambow PCB
Rambow is an open source PCB design by na103, published on GitHub under the CC-BY-NC-4.0 license. It is a 4-layer board measuring 254 × 74 mm, with 71 components from 29 distinct parts.
By type, the board carries 20 resistors, 18 capacitors, 2 connectors, 2 jumpers and 1 inductor.
From the project
1Mb Memory expansion for Dec Rainbow 100
I have successfully tested RAMbow on rev. A and rev. B. with the following operating systems: MSDOS 3.10 MSDOS 2.10 CP/M-86/80 2.10 CP/M-86/80 2.0 I have not encountered any kind of problem, both rev A and rev B have 896Kb of memory available. After building RAMbow you can test it with the diagnostic software for memory expansion rev B that you can find here
Rambow bill of materials (BOM)
71 components, 29 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | SSW-126-01-T-D | SAMTEC_SSW-126-01-T-D | J1 |
| 1 | Conn_02x20_Odd_Even | IDC-Header_2x20_P2.54mm_Horizontal | J2 |
| 2 | 74LS04 | DIP-14_W7.62mm | E1, E7 |
| 3 | 74LS258 | DIP-16_W7.62mm | E2, E3, E15 |
| 2 | 74LS393 | DIP-14_W7.62mm | E4, E25 |
| 2 | 74LS244 | DIP-20_W7.62mm | E5, E14 |
| 1 | 74LS245 | DIP-20_W7.62mm | E6 |
| 1 | 74LS27 | DIP-14_W7.62mm | E8 |
| 1 | 74LS280 | DIP-14_W7.62mm | E9 |
| 1 | 74LS125 | DIP-14_W7.62mm | E10 |
| 1 | 74LS00 | DIP-14_W7.62mm | E11 |
| 1 | 74LS03 | DIP-14_W7.62mm | E12 |
| 1 | 74LS74 | DIP-14_W7.62mm | E13 |
| 9 | TC511000P | DIP-18_W7.62mm | E16, E17, E18, E19, E20, E21, E22, E23 +1 |
| 1 | 8088 | DIP-40_W15.24mm | E26 |
| 1 | 74LS373 | DIP-20_W7.62mm | E27 |
| 1 | GAL16V8 | DIP-20_W7.62mm | E28 |
| 2 | Jumper | PinHeader_1x02_P2.54mm_Vertical | JP1, JP2 |
| 1 | 3 Omh 2.4 uH | L_Axial_L9.5mm_D4.0mm_P15.24mm_Horizontal_Fastron_SMCC | FB1 |
| 10 | 220nF | C_Axial_L3.8mm_D2.6mm_P7.50mm_Horizontal | C1, C2, C3, C4, C5, C6, C7, C8 +2 |
Show 9 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 2 | 10nF | C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C10, C11 |
| 5 | 47nF | C_Axial_L3.8mm_D2.6mm_P10.00mm_Horizontal | C12, C13, C14, C15, C16 |
| 1 | 10uF | C_Axial_L12.0mm_D6.5mm_P20.00mm_Horizontal | C17 |
| 1 | 100 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R1 |
| 10 | 39 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R2, R3, R4, R5, R6, R7, R8, R9 +2 |
| 3 | 470 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R12, R13, R14 |
| 3 | 47 | R_Axial_DIN0207_L6.3mm_D2.5mm_P10.16mm_Horizontal | R15, R16, R17 |
| 2 | 1k | R_Array_SIP10 | RN1, RN2 |
| 1 | 4.7k | R_Array_SIP10 | RN3 |
Rambow design files
The KiCad project lives in the na103/rambow repository on GitHub; these links point at the commit this page was built from.
Rambow: common questions
How big is the Rambow PCB?
The Rambow measures 254 × 74 mm, has 4 copper layers and is 1.6 mm thick.
How many components are on the Rambow?
71 components, from 29 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 Rambow design files?
From the na103/rambow repository on GitHub, which has the KiCad layout and the BOM; the links under Design files point to each one.
Can I use the Rambow 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.