Re: Replacement drive mechanism for 1581

On Sat, 20 Aug 2016, Mike Stein wrote:

> Have you looked at any of the articles & posts about modding a 'standard' PC-type drive for use in an Amiga? I've never tried it but it sounds like the same issues and relatively simple mods:
>
> -Lock in DD mode (disconnect & ground pin 2)

Done

> -Move DC to pin2

Done

> -Add RY on pin 34

Done

> -Set drive to DS0 with switch or jumper.

All PC drives and the 1581 use DS1

> Some examples:
>
> http://eab.abime.net/showthread.php?t=30944
>
> http://www.amibay.com/showthread.php?18582-Modifying-PC-Floppy-Drive-for-Amiga-Use
>
> I think your cable has a few issues as well, mainly around the drive and motor selects; looks like you're looking at the PC signal definitions/functions and not the actual disk drive meanings...
>
> m
>
> ----- Original Message -----
> From: "William Levak" <wlevak@SDF.ORG>
> To: <cbm-hackers@musoftware.de>
> Sent: Saturday, August 20, 2016 12:25 AM
> Subject: Re: Replacement drive mechanism for 1581
>
>
>>
>> Below is a diagram of the cable I am using. Dashed lines indicate changes.
>> The 1581 information comes from the 1581 service manual. The PC
>> information comes from the IBM PS/Valuepoint Hardware Maintenanve Manual,
>> except for pins 1, 3, and 5.  There does not appear to be any agreement on
>> what should be on these pins, so I have listed what I have found on a
>> number of HD drives.
>>
>>
>>  PC Drive B                                     1581
>>
>>  Gnd/NC           1                        1    NC
>> -Density Select   2 <---------,   ,------> 2    -Disk Chg (pulled up to 5V)
>>  Gnd/NC/no pin    3           '-- | -------3    Gnd
>>  NC               4               |        4    NC
>>  Gnd/NC           5               |        5    Gnd
>>  NC               6               |        6    NC
>> -Index            8 >             |      > 8   -IP (pulled up to 5V)
>> -Motor Enable 0  10 <             |      < 10   Gnd
>> -Drive select 1  12 <------------ | --,  < 12   NC
>>  Gnd             13               |   '--- 13   Gnd
>> -Drive Select 0  14 <             |      < 14   NC
>> -Motor Enable 1  16 <             |      < 16  -Motor On
>> -Direction       18 <             |      < 18  -Dirc
>> -Step            20 <             |      < 20  -Step
>> -Write Data      22 >             |      > 22  -WD
>> -Write Enable    24 <             |      < 24  -WG
>> -Track 0         26 >             |      > 26  -Tr00 (pulled up to 5V)
>> -Write Protect   28 >             |      > 28  -WPrt (pulled up to 5V)
>> -Read Data       30 >             |      > 30  -RD (pulled up to 5V)
>> -Select Head 1   32 <             |      < 32   Side 0
>>  Gnd             33 ------------- | --,    33   Gnd
>> -Disk Change     34 >-------------'   '--> 34  -Rdy (pulled up to 5V)
>>  Gnd        7,9,11,15,17,19,21,23,25,27,29,31   Gnd
>>
>>       Message was sent through the cbm-hackers mailing list
>
>       Message was sent through the cbm-hackers mailing list
>
>

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

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