On Mon, Aug 05, 2002 at 08:11:23PM +0000, Milan Pavlica YU7XW wrote:
> Hello!
> I am going to start to design a simple serial EEPROM programmer for LPT
> port.

What type of serial EEPROM?. What kind of interface (SPI,I2C)?

> Due that i have never design anything with LPT port i need a few tips..
> 1. Is there pins on LPT port that can be on same Input and Output (not
> only I or O)

Not on a standard parallel port. In EPP mode all of the data lines become
bidirectional. However the SPP is inputs or outputs only.

> 2. So, is better to use LPT port and a mass of logic devices (aka
> 74HC....) or use COM port and some uC device to setup IO lines

Well it depends on your application. Unless you're doing master I2C I can't
see how it would be a mass of logic. For SPI, like the 9366 style EEPROMs,
you should only need one simple buffer chip.

> 3. Or, best variant maybe to use LPT port with a few uC and then to get
> a full 40 pin universal programmer :|
> What is best choice to use?

You haven't given enough information to formulate a reasoned reponse. You need
to answer a bunch of questions:

* What capacity?
* What interface
* Does the part need to be programmed in-circuit?

The answers to your design questions are in the answers to those questions.

BAJ

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