Model T RAM
About the Model T RAM PCB
Model T RAM is an open source PCB design by bkw777, published on GitHub under the Custom license license. It is a 2-layer board measuring 35.6 × 20.3 mm, with 5 components from 4 distinct parts.
Other key parts include the AS6C6264-55SCN and MC74HC86ADR2G. By type, the board carries 2 ICs, 2 capacitors and 1 connector.
It belongs with the rf & radio designs in this gallery.
From the project
8K RAM module for "Model T Computers" - TRS-80 Model 100, Kyotronic KC-85, NEC PC-8201, Olivetti M10
The DIP row spacing is actually 725 mils not 700. It makes it annoying to solder because the rows don't line up exactly with the rows in a breadboard, but it's not a drawing error. Using a set of single row socket headers in the breadboard, or even two stacked, allows the socket headers to spread a little and make it easier to hold the pins and pcb for soldering, and the finished soldered pins aren't pinched inwards too badly.
Main components on the Model T RAM
Model T RAM bill of materials (BOM)
5 components, 4 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | AS6C6264-55SCN 6264 | SSOP-28 | U1 |
| 1 | MC74HC86ADR2G HC86 | SOIC-14_4x9 | U2 |
| 1 | KC-85_RAM | DIP28_725mils_pcb_pins | J1 |
| 2 | 885012207045 0.1u | C_0805 | C1, C2 |
Model T RAM design files
The KiCad project lives in the bkw777/Model_T_RAM repository on GitHub; these links point at the commit this page was built from.
- LayoutModel_T_RAM.kicad_pcb
- SchematicModel_T_RAM.kicad_sch
- BOMModel_T_RAM.bom.csv
Model T RAM: common questions
How big is the Model T RAM PCB?
The Model T RAM measures 35.6 × 20.3 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Model T RAM?
5 components, from 4 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 Model T RAM design files?
From the bkw777/Model_T_RAM 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 Model T RAM 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.
Similar boards
Hat
pa3gsb
65 × 56 mm81 parts2LNo license675
Radioberry preamp
65 × 56 mm137 parts2LNo license675
Radioberry juice
65 × 56 mm87 parts2LNo license675
Goodwatch20
travisgoodspeed
25.6 × 27.6 mm20 parts2LNo license568
GoodPocketWatch
75.2 × 101.2 mm56 parts2LNo license568
Goodwatch31
25.6 × 27.6 mm23 parts2LNo license568