Re: Replacement drive mechanism for 1581

On Mon, 22 Aug 2016, Mike Stein wrote:

>
> ----- Original Message -----
> From: "William Levak" <wlevak@SDF.ORG>
> To: <cbm-hackers@musoftware.de>
> Sent: Monday, August 22, 2016 4:59 AM
> Subject: Re: Replacement drive mechanism for 1581
>
>
>
>>> -Add RY on pin 34
>>
>> Done
>
> How?

-rdy on the 1581, pin 34, is connected to ground on the drive, pin 33

>
>>> -Set drive to DS0 with switch or jumper.
>>
>> All PC drives and the 1581 use DS1
>
> What do you base that on? Can't say that I've ever seen a system other than
   PC-compatibles that doesn't use drive 0 for the main or only drive.

Check your IBM maintenance manual. All floppy drives are configured as 
drive 1, There is a twist in the cable between drive A and B that reverses 
the connections for pins 10 thru 16.


> Also, it looks like pin 10 (/DS0) is grounded while pin 12 (/DS1) is NC,
   which would seem to suggest that the drive should be set to DS0.

1581 -motor on is on pin 16, which is the same on PC drives.  Both drive 
selects on the 1581 are NC.  That means the 1581 doesn't use drive select, 
but he PC drive does, so PC drive select 1 must be grounded.

> Alternatively, have you tried grounding pin 12?
>
As you see from my diagram, I have connected pin 12 to pin 13 on the 1581 
(Gnd)

>
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>

wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org

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