Complete USB2LPT 1.4 photo

Keywords: USB, LPT, parallel, parallel port, printer port, converter, adaptor

To USB2LPT — Overview

USB2LPT – Cloning instructions for Release 1.4

Meanwhile, the similar Release 1.7 exists.
For low-speed USB, Release 1.6 may suffice.

Electronic Components

Identical to Release 1.3. Except PCB (Printed Circuit Board), see below.
Inside device
Populated PCB


Solder Jumper

SJ1Assignment of pin 25 of D-sub female connector
right connectedPin 25 to ground (default)
not connectedPin 25 unconnected
left connectedPin 25 to 5 Volt (or 3,3V if SJ4 is right-connected)

Instead feeding 5 V directly, a self-rearming fuse like Buy Reichelt PFRA040 is recommended

SJ2Deactivation of boot EEPROM
connectedEEPROM active (connected to microcontroller)
not connectedEEPROM disabled (disconnected from microcontroller), the microcontroller defaults to a Cypress USB device
SJ3Write-protection of boot EEPROM
right connectedEEPROM writeable
left connectedEEPROM write protected
SJ4Pullup voltage
left connected5 V Pullup (compatible to true parallel ports)
right connected3,3 V Pullup (recommended for non-5V-capable inputs, like Xilinx Spartan FPGAs)