Re: Replacement drive mechanism for 1581

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)
-Move DC to pin2
-Add RY on pin 34
-Set drive to DS0 with switch or jumper.

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
> 
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