[Coco] calling all MM/1 owners

[Bob Devries]

Gene,

The fact is that this MM/1 IO board is actually *working* with the resistor 
pack fitted the wrong way. It only *sometimes* plays up, and then only at 
first startup.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "Gene Heskett" <gene.heskett at verizon.net>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Friday, January 25, 2008 3:29 PM
Subject: Re: [Coco] calling all MM/1 owners


> On Thursday 24 January 2008, Bob Devries wrote:
>>Joel, as far as I know, the termination resistors have a power and a 
>>ground
>>pin at opposite ends with a number of pairs of 220 and 330 ohm resistors
>>strung between them. The centre point of these pairs is connected to the
>>SCSI bus data/control lines. Yes, having them backwards would make some
>>difference, but how much? Certainly it appears that it's not enough to 
>>stop
>>the SCSI cold.
>
> Yes it is Bob.  That will set the logic one voltage below 2 volts.
>
> -- 
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
> It is the business of the future to be dangerous.
> -- Hawkwind
>
> --
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