2 layers37 × 19 mm
Passive rpi hub75-adapter
hzeller/rpi-rgb-led-matrix
Controlling up to three chains of 64x64, 32x32, 16x32 or similar RGB LED displays using Raspberry Pi GPIO
2 parts4.4kGPL-2.0
2 layers12.9 × 34.7 mm
WiModem to 100
bkw777/WiModem_to_1004RS-232 male-male gender-changer for connecting a WiModem232 to a TRS-80 Model 100, or any of the similar machines which has a female DB25 RS-232 DTE connector.
- Size
- 12.9 × 34.7 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 2
- Nets
- 10
- Pads
- 50
- Tracks, vias
- 45, 11
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 8 Jul 2020
- Updated
- 14 Jul 2022
Overview
WiModem to 100 is an open-source printed circuit board by bkw777, from the bkw777/WiModem_to_100 repository on GitHub, published under the CC-BY-SA-4.0 licence. It is a 2-layer board of 12.9 × 34.7 mm with 2 parts on 10 nets, routed with 45 tracks and 11 vias.
README
README.mdWiModem232 to "Model T" portable computers
More pictures: https://photos.app.goo.gl/hjoC3vnfZxWbFPRW6
RS-232 male-male gender-changer for connecting a WiModem232 to a TRS-80 Model 100, or any of the similar machines which has a female DB25 RS-232 DTE connector.
It does 3 things:
- Gender-changer. Both the WiModem232 and Model 100 and clones have female connectors. So a gender-changer or male-male cable is needed to connect them.
- Faces the WiModem232's status led and oled display towards the user. A standard mini gender-changer flips the WiModem232 over so it faces down.
- Holds the Wimodem232 vertical instead of horizontal. This just takes up less desk space and makes it less likely to knock the WiModem232 off of the serial port, and makes it a little easier to read the display from a normal position.
Wired straight-through, not null-modem. The WiModem232, like any other modem or peripheral, is wired as a DCE device, and the Model 100, like any other computer or host, is wired as a DTE device, and so to connect the two, you use a straight-through connection. The RS-232 pins; 1-8, 20, & 22, are connected 1:1 from one connector to the other.
Pin 1 is also the ground plane / copper pour on both sides of the board.
Compatibility
This is for attaching the WiModem232 to any of these machines
- TRS-80/Tandy Model 100, 200, & 600
- NEC PC-8201, PC-8201a, & PC-8300
- Kyocera/Kyotronic KC-85
But notably, NOT these
- Tandy Model 102
- Olivetti M10
On Tandy 102 & Olivetti M10 machines, the DB25 connector is upside down, and so this adapter would point the WiModem232 down into the table.
For Tandy 102 & Olivetti M10, you can use an ordinary 25-pin mini gender-changer, and the WiModem232 will point straight out from the back of the machine instead of standing vertical, and with the LED and OLED screen facing up.
This PCB is designed to use db25 connectors with through-hole legs, not solder cups.
Case
This is just the standard case from the CBMSTUFF web site, not a new design to include this adapter.
https://www.sculpteo.com/en/print/wimodem232_oled_bottom/29Vc6DYz
Parts
2| Qty | Value | Footprint | References |
|---|---|---|---|
| 1 | DB25_Male | 0_LOCAL:DSUB-25_Male_EdgeMount_P2.77mm | J1 |
| 1 | DB25_Male | 0_LOCAL:DSUB-25_Male_Vertical_P2.77x2.84mm | J2 |
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Questions
How big is the WiModem to 100 PCB?
It measures 12.9 × 34.7 mm and has 2 copper layers, 1.6 mm thick.
What parts does the WiModem to 100 use?
2 parts. 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 WiModem to 100 KiCad files?
From the bkw777/WiModem_to_100 repository on GitHub, at the commit this page was made from: the board is WiModem_to_100.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the WiModem to 100 design in my own project?
Its repository publishes it under the CC-BY-SA-4.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).