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Questions tagged [parallel-port]

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ENE KB9012 SPI protocol reflashing with parallel port

The story in short: I have a laptop which got bricked with a failed BIOS update, and it's ENE KB9012QF A3 KBC's embedded flash contents needs to be reflashed. Solutions I tried, but didn't work: ...
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4answers
173 views

Non-inverting output of transistor circuit (at NPN base) is 0.69V max. why?

I tried to make a simple NPN transistor inverter so that I can use the strobe line of the parallel port to store data in two separate flip-flop IC's. (74HC174 and 74HC574) The IC that data will be ...
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3answers
301 views

How does a USB to DB25 parallel cable work? [closed]

I've been searching for technical information to explain how this works but can't find any info, pinouts, technical reference of any form. I want to program a parallel port to control a USB device ...
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118 views

Are pull-up resistors mandatory for inputs on modern parallel ports?

Here I go again testing more circuits on two computers with each reporting completely different data yet I feed the same data in. Now this time, the data coming back is all logic highs on my laptop ...
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1answer
42 views

All possible parallel port IO addresses

I'm trying to figure out the meanings of all the parallel port IO addresses on a PC because I have custom hardware I use with it and I figure if I change a value then my hardware will work. So far, ...
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0answers
60 views

Different results for different parallel ports, same circuit. why?

This is my programmer circuit: I decided to try the HCT version of the nor gate (74HCT02) and I also decided to omit the capacitor to the reset. I selected 10K for all resistors except for reset, I ...
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1answer
74 views

Can 74HCT buffers work just as well as 74HC buffers between parallel port and target?

I'm making a circuit to program the AT89S52 microcontroller in a serial fashion as follows: Call me paranoid but this time I'm using resistors on all outputs to the micro as well as RC networks on ...
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2answers
65 views

Can an array of fuses protect a PC port from damage?

I'm paranoid right now because I made another circuit meant for the parallel port of the PC. While all my previous experiments involving the port were successful (except for one experiment I made a ...
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0answers
133 views

8051 programmer not working when laptop lid removed despite suggestions in comments

UPDATE I took a suggestion of disconnecting my external monitor from my laptop and the results were the same. What I did notice however is that the AT89S52 chip always reports the correct signature ...
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1answer
141 views

Why is the Voltage only 1.4 for reset input when in high impedance?

I attempted to make myself a 2-in-1 programmer so I can program both AT89Cx051 and AT89S52 on the same board without having to do so much plugging/unplugging of the port. The main issue is the strobe ...
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1answer
86 views

Converting parallel printer switch into USB KVM switch

cable and switch http://ibb.co/dDctkk http://ibb.co/dDOAWQ) Quick preface, I have nothing but rudimentary EE education, only what I may call "common sense" sort of knowledge. I have 3x serial (or ...
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1answer
55 views

control 3 status LEDs with 2 PCs

I'd like to control 3 status LEDs with two different PCs: an OrangePI-PC, using the GPIO pins as power source (same pinout of a RPi2); regular desktop PC, using the parallel port as power source. ...
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1answer
58 views

Oscilloscope -> Parallel port pins not sustaining high/low

So I'm using port talk (http://retired.beyondlogic.org/porttalk/porttalk.htm) on windows 7 to really simply set/unset pins on a parallel port via some c code. I've plugged in an oscilloscope to ...
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3answers
699 views

Parallel buses on a breadboard

I've built a circuit on a breadboard comprising a PIC18 reading from and writing to a HM6116 SRAM through a pair of 74HC595 SIPOs and a pair of 74HC165 PISOs. As you might expect, there are a bunch of ...
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1answer
248 views

Switching two contacts with 24VDC potential difference

This question relates mainly to the means of operating a relay module using a PC parallel port. I have outlined the application that this is to be used with but that is provided for background so ...
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4answers
4k views

Why is the serial connection faster than the parallel connection? [duplicate]

As a software developer the concept of parallel processing usually meant faster processing because it meant things don't have to wait for the other processes to finish if they don't need to. So how ...
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3answers
796 views

Is an ADC with a serial interface slower than a parallel one, both having same sampling rates?

I am trying to interface an adc with an fpga, but I am running out of pins. I wanted to know if I use an ADC with a sampling rate same as the parallel one but with a serial interface , will I be ...
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1answer
2k views

Which interface to choose SPI MIPI or Parallel?

I'm trying to connect the AR sensor module (AR0331) with the IMX6 processor and the problem is the camera uses a HiSPI & parallel line. Similarly, there is MI-PI (CSI) and Parallel line in the ...
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1answer
556 views

how to properly use external memory flash with MCU (dsPIC33)

In my project, I need to store (and read) large amount of data ( >128 Mbits). Of course, I need external flash memory (I think SD card won't work because speed is an issue in my project). So I plan ...
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1answer
893 views

Advantages of parallel over serial connections

As far as my understanding goes, parallel data connections are faster than serial at the same frequency. However, when you increase the frequency in parallel you start getting bits 'cross-talking' and ...
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1answer
1k views

Read the instrument data from printer port directly with computer

I could not find the step by step guide of some kind to accomplish what I am planning to do. I have two devices that I want to connect to PC (windows). Right now, both devices write their output ...
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1answer
351 views

Bipolar stepper motor sequence, wiring and dual h bridge

Im facing some issues to figure out sequence of my bipolar(specifically) and unipolar stepper motor. However , I've managed to get Dual H Bridge but couldn't find out the example/documentation for the ...
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2answers
626 views

Parallel port as TTL serial

Is it possible to use a parallel port (a real one, not an USB converter) as a TTL serial port equivalent, for a maximum speed of 115200 baud ? I'd like to talk to a router's serial port but I don't ...
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1answer
3k views

Connecting a parallel port to an Arduino

This is my first Arduino project and while I remember a (tiny) bit of electronics from school I'm struggling to get this working - in fact I've just fried a parallel port PCI card! I'm looking to ...
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1answer
596 views

Drive Stepper Motor using parallel Port

I'm having a little difficulty to drive this kind of motors using parallel port. Have googled loads of tutorials but unfortunately couldn't found any color codes or types of motors I have. I cannot ...
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1answer
886 views

UM232H-B Breakout Module as a parallel port

I want to build something like UM232H-B Breakout Module. This configuration uses an FT232H, to convert usb to serial/parallel. I don't know whether it works with FPGA parallel port programming cable ...
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1answer
315 views

parallel port routing

I'm currenty working on a 4 layer PCB that requires two parallel memories.My question regards the distribution of the traces in the PCB. Is it better to trace them like a bus: or is it better to ...
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1answer
1k views

Using USB to Parallel Port, Send an 8-bit data of Assembly Code [duplicate]

For educational purposes, our professors have DB25 ports on our laboratory rooms, and of course we can only simulate our assembly codes in there Our professor said that it might not be possible to ...
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1answer
2k views

how to regulate parallel port pin output voltage to 5V

simulate this circuit – Schematic created using CircuitLab Parallel port ideally gives TTL logic 0(low) and 5V (high). But my port gives 3.3V high. I have designed my controlcircuit assuming ...
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2answers
1k views

ISP circuit for AVR microcontrollers

So I was doing a bit of research on the AVR controllers and came across this schematic for programming the chips. After doing research on the 74 LS 254, I realized that either this design is ...
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7answers
2k views

Best PC interface for simple custom hardware

What interface of your PC do you use in order to connect to simple custom hardware? The most commonly used interface was RS232 some while ago and today is probably USB, but wouldn't it be simpler for ...
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2answers
1k views

Why did the datasheet mention this interface?

I have a ST32F103RET6 MCU. I got the datasheet (and refrence manual). When I read the datasheet (and refrence manual), I found this section: Now I have several questions about it: Why does the ...
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2answers
314 views

switch status indicator with parallel port

I have put together the circuit below. If the switch is closed the LED should turn off and the parallel port should read the change. The status of the port can be read. But every time the circuit is ...
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1answer
3k views

How to send raw data to IEEE-1284 Parallel Printer Cable?

At my university we have to do some project using parallel port (I know ridiculously old port). We bought a USB to Parallel Printer cable used to connect old parallel printers and the device is an ...
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2answers
6k views

How to do a loopback test of a parallel port?

I have connected pin 2 to pin 3, pin 4 to pin 5, and pin 6 to pin 20. Can someone please tell me if this is the correct wiring for loopback testing a parallel port? Ia am using BurnInTest 7.1 Pro by ...
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1answer
466 views

Can we operate a 6VDC Relay using Parallel Port signal, without a Darlington Transistor, with only these components?

Before anyone downvotes the question for my recklessness: Disclaimer: I acknowledge that it is not advisable to make the connections mentioned in the question. This is just a hobby experiment where I ...
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2answers
3k views

LED control via USB to Parallel Port in Linux

I have USB to 25pin Logilink cable. I connect it with computer with Linux and get a port in /dev/usb/lp0. When I connect LED with pin 1 and 25 as +/- of LED it lights. Now I move + pin of LED to pin2 (...
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3answers
2k views

Parallel port controls a relay

If I want to use a parallel port to control this 8 channel relay instead of Arduino, do I need to make any modifications?