[vcf-midatlantic] Shugart SA800-2 drives
Mike Loewen
mloewen at cpumagic.scol.pa.us
Wed Mar 23 04:40:19 UTC 2022
I've seen that, as well.
Would you believe dirty phototransistors? I have one of the drives working
well. The other worked for a bit, then stopped recognizing the index again. I
need to get back into it and do some tweaking.
When checking the index sensor against the maintenance manual, I was able
to adjust for a good pulse width (section 4.7.2) with the phototransistor pot
on both drives. But, on the index/sector adjustment (4.7.3), I was unable to
see the pulse as described. My scope was set up exactly as in 4.7.3, but I
couldn't see it on either drive.
I'll dive back into the troublesome drive, tomorrow.
http://bitsavers.org/pdf/shugart/SA8xx/50575-4_SA800_Maint_Feb78.pdf
On Tue, 22 Mar 2022, Jonathan Chapman wrote:
> That's usually a sign you're getting no index pulse, in my experience.
>
> Thanks,
> Jonathan
>
> ------- Original Message -------
>
> On Tuesday, March 22nd, 2022 at 02:10, Mike Loewen via vcf-midatlantic <vcf-midatlantic at lists.vcfed.org> wrote:
>
>> I have a pair of Shugart SA800-2 8" drives, which are mounted in a
>>
>> Micromation enclosure. Both drives have the factory jumper configuration,
>>
>> except for the B: drive which has the termination jumpers (T3, T4, T5 and T6)
>>
>> removed and DS2 installed.
>>
>> I've connected them to my media system via an older FDADAP board. Using the
>>
>> IMD program, I try and read a single-sided disk that has valid data. The drive
>>
>> selects and the head-load solenoid activates. After several seconds, IMD
>>
>> displays a "No interrupt from FDC" error. The same thing happens with both
>>
>> drives. The Alignment function doesn't recognize anything from the disk.
>>
>> I've successfully used this system with Tandon TM848-2 drives, and a
>>
>> Siemens 120-8. Before I start chasing signals, are there any obvious pitfalls
>>
>> to using a SA800-2 with a (relatively) modern PC?
>>
>> Should the DC (Disk Change) jumper be installed? By default, it is not. I
>>
>> noticed that on the Tandon drive, DC is installed.
>>
>> I have the operating and maintenance manuals for the SA800/801 drives.
>>
>> Mike Loewen mloewen at cpumagic.scol.pa.us
>>
>> Old Technology http://q7.neurotica.com/Oldtech/
>
Mike Loewen mloewen at cpumagic.scol.pa.us
Old Technology http://q7.neurotica.com/Oldtech/
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