OPUS 5802 5 1/4" Disk Drive

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stevendt
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OPUS 5802 5 1/4" Disk Drive

Post by stevendt » Wed Feb 21, 2018 5:24 pm

Hi,

Can someone tell me a bit more about this unit please?

I have one of them that I got to use with my Memotech systems but it's surplus to requirements and I wanted to know a little more about it before I decide how to dispose of it.

The drive appears to be single sided but the enclosure has a 40/80 track switch. I'm a bit surprised that a single sided drive can do 80 tracks but it seems to work fine that way. I can read/write from/to the disk in Memotech SS/SD and SS/DD modes so the drive works with those formats.

Does anyone know if the 5802 was a standard product, or if there were different drives fitted?
(I realise that someone could have fitted another device after market though)

regards
Dave

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1024MAK
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Re: OPUS 5802 5 1/4" Disk Drive

Post by 1024MAK » Wed Feb 21, 2018 5:57 pm

Have you taken the cover off and had a look inside?

Go on, warm them screwdrivers up...

Mark
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stevendt
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Re: OPUS 5802 5 1/4" Disk Drive

Post by stevendt » Wed Feb 21, 2018 6:01 pm

Hi Mark,

yes :D

I can't see any wires going to the bottom "head", though there does look like there may be a head embedded in the ceramic, it looks like a single bit of metal - no tunnel erase heads, it does not look like a "real" head, so it may indeed be SS.

There is no manufacturer's name on the drive, though it does have a model number (SM596DB), Google doesn't return any hits on it

regards
Dave

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1024MAK
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Re: OPUS 5802 5 1/4" Disk Drive

Post by 1024MAK » Wed Feb 21, 2018 6:21 pm

I don't know about Opus drives specifically, but with most disk drives for the BBC (and other computers that used standard drives), the actual drive inside the case is a generic one.

Mark
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Re: OPUS 5802 5 1/4" Disk Drive

Post by Lardo Boffin » Wed Feb 21, 2018 9:10 pm

I’m pretty sure my Opus Challenger 3 has a Mitsubishi drive inside it.
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CMcDougall
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Re: OPUS 5802 5 1/4" Disk Drive

Post by CMcDougall » Wed Feb 21, 2018 9:31 pm

it's defo for the beeb, as that's what I had BITD :D

mine still works brilliantly,

had to take a pic of it for someone to fix theirs, so compare with this pic:
viewtopic.php?f=3&t=4824&p=69211&hilit=OPUS+5802#p69354
may be your jumpers back left of pic need to be set to mine, for drive 0&2 8)
don't know /have pic of jumpers for drive 1/3 :?
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Re: OPUS 5802 5 1/4" Disk Drive

Post by stevendt » Thu Feb 22, 2018 12:14 am

Hi,

yes, it's definitely for the Beeb - it has a connector for the BBC disk power supply.

I saw the photo that you posted of your drive, on yours, the Mitsubishi logo is obvious on the PCB. On my drive, initially, I didn't t see any logos or other indication of the drive manufacturer, but from the photo, I have just noticed that the PCB is marked Sanyo. The drive is pinned for ID 1, and, as I mentioned, works fine as a SS disk on a non-BBC computer. Again, based on closer inspection of my photo, there may be two pairs of head connections from the PCB, so the question still remains is it a single or double sider drive. Is you Mitsubishi drive single or double sided?

Photos attached

regards
Dave
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CMcDougall
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Re: OPUS 5802 5 1/4" Disk Drive

Post by CMcDougall » Thu Feb 22, 2018 8:59 am

^ mine is a double sided drive & duel.

yours looks like a double sided drive & obviously single being drive 0&2 (no 1&3)

Drive 0 head is on bottom & top one is 2

I have one similar to yours but is a TEAC inside, only 40track, and single as no top head, will grab a pic later...
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Re: OPUS 5802 5 1/4" Disk Drive

Post by Kazzie » Thu Feb 22, 2018 9:37 am

CMcDougall wrote:^ mine is a double sided drive & duel.

yours looks like a double sided drive & obviously single being drive 0&2 (no 1&3)
But the photo above shows the drive is jumpered as drive 1 (for a range 0-3), so as the second physical drive it's two heads would be DFS drives 1&3.
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Re: OPUS 5802 5 1/4" Disk Drive

Post by stevendt » Thu Feb 22, 2018 12:10 pm

Hi,

ah, I hadn't appreciated that side 0 was the bottom head, so, I can see that it must be a DS drive. If one head is not working, then I guess there must be a fault on the drive. I will try cleaning the upper head (again), but it seems that the drive may only be partially working

regards
Dave

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Re: OPUS 5802 5 1/4" Disk Drive

Post by Kazzie » Thu Feb 22, 2018 1:59 pm

As well as a head clean, check that the connection of the head wires to the board (the black JAE plug near the front of the drive) is clean and secure.

Another relatively easy (low disassembly) check is to see if the heads come together (i.e. rest on the disk) properly. Obviously you'll want to do this without a disk in the drive, so you can see the lower head, but you normally can't close the lever without putting a disk in. To circumvent this, you'll need to push the catch connected to the spring circled in the image below:
floppydrive.jpg
This catch is normally pressed by the disk as you push it into the drive. If you press that catch yourself, you'll be able to turn the drive door lever and watch the heads move together.
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stevendt
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Re: OPUS 5802 5 1/4" Disk Drive

Post by stevendt » Thu Feb 22, 2018 2:26 pm

Hi,

thanks for the tips, but all sorted now :)

It turns out that the data cable that I was using for testing (not the one that's attached to the case) is faulty.
After I cleaned the heads, in "clutching at straws" mode, I readdressed the drive as "2" and found that it worked perfectly in DS mode.
In fact, IDs 0 and 2 worked, 1 and 3 didn't.
Changing the cable (to the one that was originally attached to the drive) means that the drive now works correctly on all IDs.
(I was using a temporary cable for testing as it was easier for me to attach to the disk controller)

So, I am happy that the drive works perfectly, I just need to decide how to "dispose" of it now

Thanks for the help folks

regards
Dave

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1024MAK
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Re: OPUS 5802 5 1/4" Disk Drive

Post by 1024MAK » Thu Feb 22, 2018 3:00 pm

Advertise it in the for sale section on here :wink:

Mark
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