Re: MFM drive gone nuts

From: Clockmeister <>
Date: Mon, 21 Jul 2014 07:06:52 +0800
Message-ID: <>
On 21/07/2014 6:50 AM, wrote:
> Hello!
> W dniu 2014-07-20 15:38, Julian Perry napisaƂ(a):
>> As dodgy as it sounds, you might try switching 5/6/7/8 ALL CLOSED 
>> (making
>> drive selects 0,1,2,3 ALL responsive). Unlike Head select (which is a
>> binary word) - Drive select are actual individual select lines.
> I went home and tried that, but after I turned the computer on, 
> something very wrong happened to the drive - it does not spin. The LED 
> flashes an error message, which according to the technical manual 
> indicates "Index pulse not detected during spinup" which as I 
> understand indicates that the drive CPU detected that it cannot spin.
> I think the drive just died :-(

Cable accidentally refitted wrong way around?

> Oddly, the computer failed too and now indicates "RAM Error" on 
> startup. I wonder whether these two issues are related, but I have no 
> idea how.
> Now I need to find TMS4256 chips to replace the RAM in the computer, 
> hopefully it will fix the issue. As for the drive, I am afraid it's 
> over...

If it doesn't spin there is possibly a microfuse somewhere near the 
power connector that has popped . Follow the 12V line it will be in 
series with it.

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Received on 2014-07-21 00:00:02

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