Serial port to Parallel Port Bridge Design

[krubil]

 I am retired Electronic Engineer.I think this is perfect forum to share my designs.
 Seems people are looking for USB to Parallel Port or Serial Port to Parallel port designs.
 My first problem is how do I post my schematics (.jpg) to this forum?.
 Here is brief description of my design.

 uses serial port in bit bang mode and creates parallel port signals (17 signal pins).
 restriction is you have to interface control port signals to decoder(ie. 74ls138 ) to create
 write,read strobes for data.

 krubil@verizon.net

[Jan Axelson]

You can attach a file by clicking "Additional Options" at the bottom left of the message box. Note the size limit.

Jan

[krubil]

Here are links to design

http://i1134.photobucket.com/albums/m620/krubil/Serial_Parallel_page2.jpg

http://i1134.photobucket.com/albums/m620/krubil/Serial_Parallel_page1.jpg

Protocol is very simple Mode latch latches Read or Write,Serial shift register stores byte and RTS and DTR provide Address
A1 and A0.After shifting data RTS must return to High before address is applied.TXD provides low going pulse to transfer
Data to selected address.(transmit either h'00 or h'FF).Design is Scalable.RXD returns data written and data read.

I will have detail theory of operation very soon.I'll appreciate any feedback.

As design stands you can directly interface 82C55A without any glue logic.
Please ask any questions you might have.I will be happy to answer them.

Kaustubh Shah
krubil@verizon.net

[Jan Axelson]

Thanks for sharing your design!

Jan