2 layers54 × 63.6 mm
2 layers35.6 × 20.3 mm
Model T RAM
bkw777/Model_T_RAM198K RAM module for "Model T Computers" - TRS-80 Model 100, Kyotronic KC-85, NEC PC-8201, Olivetti M10
- Size
- 35.6 × 20.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 5
- Nets
- 32
- Pads
- 74
- Tracks, vias
- 111, 4
- Pours
- 81
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 13 Apr 2021
- Updated
- 30 May 2026
Overview
Model T RAM is an open-source printed circuit board by bkw777, from the bkw777/Model_T_RAM repository on GitHub. It is a 2-layer board of 35.6 × 20.3 mm with 5 parts on 32 nets, routed with 111 tracks and 4 vias.
It is built around the AS6C6264-55SCN and MC74HC86ADR2G-TP. Its parts include 2 capacitors, 2 ICs and 1 connector. It belongs with the radio and wireless boards of this library.
Main components
2README
README.mdModel_T_RAM
8K RAM module for "Model T Computers"
- TRS-80 Model 100
- Kyotronic KC-85
- NEC PC-8201
- Olivetti M10
Gerbers available in releases.
PCB from OSHPark
PCB from PCBWAY
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.
keywords: Radio Shack TANDY TRS-80 26-8301 NEC PWD-458 72404582 Kyocera Kyotronic KC-85 Olivetti M10 M-10 PC-8201 PC-8201A Model 100 8k sram
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Questions
How big is the Model T RAM PCB?
It measures 35.6 × 20.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Model T RAM use?
5 parts, built around the AS6C6264-55SCN and MC74HC86ADR2G-TP. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Model T RAM KiCad files?
From the bkw777/Model_T_RAM repository on GitHub, at the commit this page was made from: the board is Model_T_RAM.kicad_pcb and its schematic Model_T_RAM.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Model T RAM design in my own project?
Its repository states no licence, so its author keeps all rights: ask bkw777 before reusing the design.