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2021-03-29 16:38:00 -05:00
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# interface1
A serial attached Arduino interface using the National Semiconductor DP8340 and DP8341.
Legacy interface using obsolete National Semiconductor DP8340 and DP8341.
![interface1 assembled](.images/hero.jpg)
This project uses several obsolete components; you may be able to find these as _new old stock_. See [interface2](../interface2) for a modern alternative using a Lattice iCE40 FPGA and STM32 microcontroller.
## Hardware
You can find the Gerber files for fabricating a PCB in the [fabrication](hardware/fabrication) directory. I have used JLCPCB to make the PCBs.
This interface requires an [Arduino Mega 2560 R3](https://store.arduino.cc/usa/mega-2560-r3).
Item | Quantity | Description | Reference | Part Number | Source
:----:|---------:|-------------------------------|------------|-------------------------------|----------------
1 | 1 | IBM 3270 Protocol Transmitter | U1 | National Semiconductor DP8340 | Obsolete - eBay
2 | 1 | IBM 3270 Protocol Receiver | U2 | National Semiconductor DP8341 | Obsolete - eBay
3 | 1 | Quad RS-422 Line Driver | U3 | Texas Instruments DS3487 | Obsolete - eBay
4 | 1 | Pulse Transformer - 1:1:1 | T1 | Pulse PE-5762 | Obsolete - eBay
5 | 1 | Crystal - 18.867 MHz | Y1 | IQD LFXTAL057125 * | [Mouser](https://www.mouser.com/ProductDetail/IQD/LFXTAL057125Bulk?qs=%2Fha2pyFaduieSzBxw7UAJRZlCXjBZuIKPyofrMyYW7wVunrhuBMeiQd4MCF50LLz)
6 | 2 | Resistor - 33 ohm | R2, R4 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-33-RC?qs=sGAEpiMZZMu61qfTUdNhGzoeXLT9qgk%252BV159XfY8c4Q%3D)
7 | 1 | Resistor - 120 ohm | R6 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-120-RC?qs=sGAEpiMZZMu61qfTUdNhG7Of23Pr6gu8rRE5UXBJoDw%3D)
8 | 2 | Resistor - 150 ohm | R1, R5 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-150-RC?qs=sGAEpiMZZMu61qfTUdNhG2ZzrN2CiS9nBcPQNrtAXYk%3D)
9 | 1 | Resistor - 500 ohm | R7 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-499-RC?qs=sGAEpiMZZMu61qfTUdNhG6lpw21m8SOsvE2iEnaSg1s%3D)
10 | 1 | Resistor - 510 ohm | R3 | | [Mouser](https://www.mouser.com/ProductDetail/Xicon/271-510-RC?qs=sGAEpiMZZMu61qfTUdNhG9RrhBeDi8B8FBVTnOgGHiw%3D)
11 | 1 | Capacitor - 30 pF | C1 | | [Mouser](https://www.mouser.com/ProductDetail/Vishay-Cera-Mite/561R10TCCQ30?qs=sGAEpiMZZMt1mVBmZSXTPNbSVgF1iSv4q4pBhPBLwuM%3D)
12 | 3 | Capacitor - 0.1 uF | C2, C3, C4 | | [Mouser](https://www.mouser.com/ProductDetail/Vishay-BC-Components/K104K15X7RF53L2?qs=%2Fha2pyFadujZBSsyKhN2cCnGMY0oYMxsnapy5diPgBuVoINU4ePXMg%3D%3D)
13 | 1 | BNC Jack | J1 | | [Mouser](https://www.mouser.com/ProductDetail/TE-Connectivity/5227161-3?qs=%2Fha2pyFaduiGA%252Bh8aDcjGvgxten7RGi%2FL59ZMwKXDjte07aSAL7vPw%3D%3D)
You can find a [complete BOM](https://octopart.com/bom-tool/SZ3rSPgD) on Octopart. I have purchased all current components from Mouser and obsolete ones from eBay.
\* - SMD
You can find the Gerber files for fabricating a PCB in the [fabrication](hardware/fabrication) directory. I have used JLCPCB to make the PCBs.
## Firmware