Re: serial link high level protocol thoughts?

From: David Wood (
Date: 2008-11-08 06:34:27

On Fri, 7 Nov 2008, Jim Brain wrote:


> As to your inquiry about not being able to drive a 1541 from the AVR, I
> wonder if the AVR cannot sink enough current to overcome the 1KOhm
> pullups in the 1541.  It would not be my first thought, but aside from
> protocol concerns, one must consider the electrical portion of the bus.

As for the comment about the AVR overcoming the 1k pullups, the uIEC works
great on my system:

  1571D    (8)
  Indus GT (11)
  1581     (10)
  1541     (9)
  UIEC     (12)

It would seem that the atmega128 can do it.  I wonder about the smaller uCs..

> Jim

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