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Complete USB2LPT 1.4 photo

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

Converter from USB to parallel port (25 pin SubD receptacle) with hardware virtualization at input/output instruction level
Supports all parallel port modes named SPP, EPP and ECP, 16 Byte FIFO depth
USB High Speed (480 Mbit/s signaling; 8 kByte/s at input/output instructions)
Multifunction device with extra USB to parallel printer support in accordance to USB printer class specification
Full open-source, even for schematics and PCBs

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

Software⚓

Circuit Diagram and PCB Silkscreen, Source for PCB software Eagle
Firmware same as Revision 1.3

Solder Jumper⚓

SJ1	Assignment of pin 25 of D-sub female connector
	right connected	Pin 25 to ground (default)
	not connected	Pin 25 unconnected
	left connected	Pin 25 to 5 Volt (or 3,3V if SJ4 is right-connected) Instead feeding 5 V directly, a self-rearming fuse like Reichelt PFRA040 is recommended
SJ2	Deactivation of boot EEPROM
	connected	EEPROM active (connected to microcontroller)
	not connected	EEPROM disabled (disconnected from microcontroller), the microcontroller defaults to a Cypress USB device
SJ3	Write-protection of boot EEPROM
	right connected	EEPROM writeable
	left connected	EEPROM write protected
SJ4	Pullup voltage
	left connected	5 V Pullup (compatible to true parallel ports)
	right connected	3,3 V Pullup (recommended for non-5V-capable inputs, like Xilinx Spartan FPGAs)