[Coco] Timing problem with the CoCo and the WD1773 ?

Gene Heskett gene.heskett at verizon.net
Mon Aug 7 10:23:43 EDT 2006

On Monday 07 August 2006 06:46, Robert Gault wrote:
>I believe you are thinking of the missed IRQ problem. That was fixed by
>toggling GIME IRQ in the clock module. The BLOB bug is a different
> problem.

You are correct, memories fade in 12 years.

>The correct explanation of the BLOB (there are others) is on RTSI.
>www.rtsi.com/OS9/OS9_6X09/TXT  BlobStop.lzh   It is unfortunate that
>this paper is under OS-9 as the problem has nothing to do with OS-9 but
>rather is a Western Digital controller problem.

Unforch I'm on linux now, so I had to unpack it with mc, then call it into 
kwrite to fix the eol conventions.  Once that was done then a good read 
has refreshed my memory, thanks.

>We have added blob stop code to NitrOS-9 so it should no longer be
>afflicted by this problem.

I knew it hadn't been a problem for me in quite some time, and I recall 
that my personal fix was haveing 4 versions of the init module, 2nd with a 
padding byte added, 3rd with 2 padding bytes, and the last with 3 padding 
bytes added. I kept them early in the bootfile so I could swap them and 
find the one that was the correct length to fix it.  With all the problems 
the WD1773 had, I'm amazed the shack didn't byte the compatibility bullet 
and use something else eventually.

Cheers, Gene
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