[Coco] Disto SC (NOT) needed

[Roger Taylor]

At 12:40 AM 11/15/2008, you wrote:
>Roger,
>
>Do you hear the heads move before the crash? Does it seem to crash at
>a point where it would actually be reading a sector (seek to the
>correct track completes successfully)? This usually indicates a
>problem with the HALT or NMI, but those problems are normally isolated
>to an individual CoCo (CPU). You say this happens with several CoCos
>which has me a liitle perplexed. You can try this BASIC one-liner to
>test the controller's HALT circuit:
>
>POKE &HFF48,3:POKE &HFF40,128


Darren,

You're a genious.  I don't think I've ever seen a solution from you 
that wasn't 99.9% or 100% "good".

I typed those POKEs and the problem was reproduced.  I tried another 
64k ECB CoCo 2 and now my "controller" works.  So, I suppose both of 
my CoCo 1's have the NMI line screwed up.  Is there a fix for THAT ?  :)

I guess I could have wiggled the controller on accident while the power was on.

Many thanks on the tip!

-- 
Roger Taylor

http://www.wordofthedayonline.com