What can you do with a Parallel Port ?

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Por luppie

Paladin (869)

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16-06-2013, 11:39

We all know we can use a parallel port for printing, but what else can you do with it ?

  • A month ago I finished this switching circuit : Switching Stuff
  • Also I know it's possible to build a Covox, so the parallel port is used as a DAC to produce music.
  • Today I came across Tada-Midi and Dual-Midi that uses the parallel port as a Midi Interface (could not find any link describing the pinout and/or how it works)

What else can be done with a Parallel Port ?

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Por Guillian

Prophet (3513)

Imagen del Guillian

16-06-2013, 11:57

About 10 years ago I made a virtual SNES controller. So you can connect your MSX to a SNES and play games using the MSX keyboard.
Also, I added some options to make combos.
This was a strange request by Imanok (^^!)

But it was cool to play Street Fighter 2 from MSX (and some people tought that actually the game was running on the MSX XD)

Por syn

Prophet (2106)

Imagen del syn

16-06-2013, 12:25

Haha this is awesome stuff really. would have loved to see that in action Wink Happen to have some video of it? Big smile

Por MsxKun

Paragon (1112)

Imagen del MsxKun

16-06-2013, 15:50

You could switch on/off leds. Or interact with other IC's using TTL? Or a 16x2 LCD screen...

Por flyguille

Prophet (3028)

Imagen del flyguille

17-06-2013, 01:50

EXPERIMENT 1: I used like in 1992 the parallel plugged to a like DAC resistors (IIRC was GND - 1k + signal OUTPUT+ 1k + 1k + 1k + 1k + 1k + 1k + 1k + 1k ), some like that for outputing WAVE to the sound channel, it is very EASY to do, can fit all in the LPT plug, so you don't needs to hard modificate the MSX itself and piggy the output to the sound channel.

As I wasn't capable to record, the idea was to use a MIC and monitor in an old full analog TRC osciloscope (Yes I have one ugly shity triggering as analog can be), and to see how are the vocals real soundwave, and then to try to draw those waves using HEX numbers feeded in DATA sentences of a BASIC's programs, the idea was to see if I was able to replicate the human voice.

I was capable of get VERY CLOSE results to the real voice, but noisy as hell.

EXPERIMENT 2 with MSX: later, I was looking a way to RECORD digital lines, without access to a real digital osciloscope by its very expensive price, and I was needing to decode the communication between a microcontroller and its CMOS 8 pins DIP memory, (in a radio-cassette for cars) with anti-thief system where you enters a code that can be from 1111 to 6666 to unlock, I was trying to visualize for the code being readed by the microcontrolled from that fucking CMOS RAM chip. It is basicaly works like a serial, so basicaly I was looking on DATA & CLOCK, I use the JOYSTICKs inputs for that, create a litle basic program that acts like an osciloscope with the capability to SAVE multichannel digital data syncronously, and then to study those strips, screen 2 & just BASIC is enought for that low frequency communications.

EXPERIMENT 3: Merge, 8 joysticks inputs as digital sensors, plus 8 outputs (LPT PORT) to control everything you want, converting the MSX as a big programable easy MICROCONTROLLER Big smile YOU CAN DO 3D printing with that IF you want, it has enough inputs as outputs to control everything, but I did that to control lights in a dance (not the professional equipment with professional protocols, no, it was homemade lamps controlled with some electronics, in a piggy proto board (now all that is garbage in some box)).

Por luppie

Paladin (869)

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01-07-2013, 21:43

Hooked up a relay board to my 'experimental' parallel port cartridge.

I used a ULN2803 to protect the parallel port and a step-down converter to power the relay board with a external power supply.

Here is how it looks like:

And a movie of it in action:

Por luppie

Paladin (869)

Imagen del luppie

02-07-2013, 22:42

Got my empty cartridges today and made a 2nd version of my 'experimental' parallel port cartridge.

Everything in 1 cartridge :D
The Jumperblock of 8 jumpers (D0..D7) on top can be used to redirect a datapin to a Led. Without the jumper the datapin can be used for example a Relay (see my relayboard) or a servo or an arduino or what ever you want to control.

The 2 other jumpers redirects Busy & Strobe to Ground.
The 2 other pins are 5V & GND (not to be jumpered :p )

On the side there is a power connector to supply 5V, the input voltage can be between 6V & 30V, a step down transformer, transforms it to 5V. This Powersuply is decoupled with a ULN2803.

Por luppie

Paladin (869)

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03-07-2013, 09:17

Por x-nen Aivalahostia

Paragon (1513)

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03-07-2013, 10:34



Enlighted (5976)

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31-12-2013, 09:24

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