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worlickwerx / pi-parport

retro parallel port for raspberry pi
GNU General Public License v2.0
67 stars 12 forks source link

fix v1 design based on discrete logic #15

Closed garlick closed 4 years ago

garlick commented 6 years ago

A couple of people have mentioned that the SN74LVC161284 chip used in the v2 hardware design is not available in their countries. (As a side note, I have been able to source the SSOP (DLR suffix) parts through Arrow Electronics which claims to ship internationally)

Another option might be to augment the v1 hardware that was based on the 74AHCT541 with bidirectional support and better line termination. Details TBD.

garlick commented 6 years ago

Luciano Camera found this chip that might be an alternative to the SN74LVC161284:

https://www.nexperia.com/products/logic/asynchronous-interface-logic/printer-interfaces/series/PDI1284P11.html

garlick commented 6 years ago

Luciano also prototyped a new design using 74HC245 and 74HC541, with Vcc at 5V, and a voltage divider to convert to pi 3V3.

garlick commented 4 years ago

I'm not sure this is really worthwhile, unless maybe someone wants to do a through-hole version that's also easier to solder than the current SMT part. Closing for now as I don't think there's interest.