Re: serial link high level protocol thoughts?

From: Jim Brain (
Date: 2008-11-09 05:13:38

Wolfgang Moser wrote:
> Hello Jim,
> I told him about the construction of the XA1541 cable and
> the long history about finding and measureing the right
> transistor types to serve the IEC bus in the best way.
It'd be nice to see a condensed version of this.

> In the end, if you want to prevent yourself and your
> customers from too many support sessions, I strongly
> recommend to spend some extra drivers to drive the IEC bus.
> Taking some digital switching MOSFETs like the BS170,
> 2N7000 or 2N7002 would enable the ÁIEC to securly drive
> more than 5 devices on the IEC bus (C64 plus 4 devices),
> even when fast speeder protocols are used that require
> low falling times (IEC bus line getting active).
The next board revision of uIEC will use inverting open collector 
buffers, like the rest of the drives.  MOSFETs and such are nice, but 
it's harder to stuff a board with them (as I noted to Shadowolf) and a 
buffer IC will accomplish the same thing.


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