Re: Replacement drive mechanism for 1581

----- Original Message ----- 
From: "William Levak" <wlevak@SDF.ORG>
To: <cbm-hackers@musoftware.de>
Sent: Wednesday, August 24, 2016 12:14 AM
Subject: 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

I don't see that on your diagram; instead:

> -Disk Change     34 >-------------'   '--> 34  -Rdy (pulled up to 5V)

Also, some drives/controllers require a 'real' Ready signal; the Amiga mods do supply it...

>>>> -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.

No need to be condescending...

Read that again; of course PC drives are set to DS1, I'm questioning the "and the 1581" part.

...> Both drive selects on the 1581 are NC.  That means the 1581 doesn't use drive select

Pin 10 (DS0) of the 1581 looks grounded to me (since there's only one drive); if the drive's not selected it won't do much... 

You'd be better off using the *drive* signal definitions instead of the 'twisted cable' PC definitions.

Your diagram shows pin 10 grounded as it should be, so the drive should be set to DS0.
 
> but he PC drive does, so PC drive select 1 must be grounded.

In a PC, yes ;-)
 
>> 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)

Really? Looks like NC to me:

--- 
-Drive select 1  12 <------------ | --,  < 12   NC
  Gnd             13               |   '--- 13   Gnd
---

The bottom line is that the 1581 and Amiga drives are interchangeable, so that as I suggested the various documented mods on the Web to adapt a PC drive to an Amiga will also apply to the 1581.

From the English Amiga Board:

Get _RDY to pin 34 and _DC to pin 2, make the drive answer to DS0 instead of DS1.


Apologies for wasting your time (and mine) trying to help; didn't realize you just want to argue...

Good luck!

m

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