2 layers53.8 × 30.5 mm
Sharp serial-6pin
cazacov/PocketComputers
My experiments with programmable calculators and pocket computers
7 parts4MIT
2 layers41.9 × 54.1 mm
Ram card-256k
cazacov/PocketComputers4My experiments with programmable calculators and pocket computers
- Size
- 41.9 × 54.1 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 48
- Pads
- 137
- Tracks, vias
- 405, 33
- Routed
- Yes
- KiCad
- KiCad 6 (file 20211014)
- Created
- 2 Oct 2022
- Updated
- 23 Jan 2023
Overview
Ram card-256k is an open-source printed circuit board by cazacov, from the cazacov/PocketComputers repository on GitHub, published under the MIT licence. It is a 2-layer board of 41.9 × 54.1 mm with 12 parts on 48 nets, routed with 405 tracks and 33 vias.
It is built around the HC138, 1N4148W and RB160M-30. Its parts include 3 resistors, 3 ICs, 2 diodes, 1 capacitor and 1 connector.
Main components
3README
README.mdPocket Computers
My experiments with programmable calculators and pocket computers.
Sharp Pocket Computer PC-E500 / PC-E500s
RAM upgrade to 128K
PC-E500/E500s RAM upgrade project
DIY 256K RAM card
All trademarks, logos and brand names are the property of their respective owners. All company, product and service names are for identification purposes only.
I am not an electronics engineer. It's a hobby project. Use it at your own risk.
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 47 K | Resistor_SMD:R_1206_3216Metric | R1, R2 |
| 2 | KM681000BLG | Package_SO:SSOP-32_11.305x20.495mm_P1.27mm | U2, U3 |
| 1 | 1N4148W | Diode_SMD:D_SOD-123 | D2 |
| 1 | 330 nF | Capacitor_SMD:C_1812_4532Metric | C1 |
| 1 | 470 K | Resistor_SMD:R_1206_3216Metric | R3 |
| 1 | CR1216 | custom-footprints:Battery_CR1216_hole | BT1 |
| 1 | HC138 | Package_SO:SOIC-16_3.9x9.9mm_P1.27mm | U1 |
| 1 | R./W. | custom-footprints:slider_switch_7x3 | S1 |
| 1 | RAM card connector | custom-footprints:RAM_card_connector_35 | J1 |
| 1 | RB160M | Diode_SMD:D_SOD-123 | D1 |
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Questions
How big is the Ram card-256k PCB?
It measures 41.9 × 54.1 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Ram card-256k use?
12 parts, built around the HC138, 1N4148W and RB160M-30. 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 Ram card-256k KiCad files?
From the cazacov/PocketComputers repository on GitHub, at the commit this page was made from: the board is sharp-e500/RAM-card/ram-card-256k/ram-card-256k.kicad_pcb and its schematic casio-pb-1000/RAM-card-RP-32/RP-32/RP-32.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Ram card-256k design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).