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GianDO's picture
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Joined: 2021 Feb 11
AppleCD SC Plus

Hi,
I managed to get an external AppleCD SC Plus cd player. I would like to know if it is possible to connect it to any Mac with a DB25 SCSI port and if a special cable is needed, or I can use any Centronics cable to SCSI DB25?
Also I don't see trace of a terminator on the device, maybe it terminated automatically?

Thank you
G.

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MikeTomTom's picture
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Joined: 2009 Dec 7

Hi G. If the ports at rear of the drive are 50 pin, then the cable will need to be 50 pin to 25 pin SCSI - I've heard the term "Centronics SCSI" before, but I think this refers to the plug which is identical to a Centronics plug (though is SCSI, from end to end). But yes, you should be able to connect this to any Mac with a DB25 SCSI port.

If there are two 50 pin sockets, then you will need a terminator for the socket not connected to the CD drive (or be connected to SCSI chain of devices with a terminated device at the end of the chain).

If this CD is the original AppleCD SC Plus drive, then it will be a single speed CD ROM drive. The "plus" bit refers to its ability to read 700MB media. Also of note is it cannot read CD-R media (at least in my experience this was true).

GianDO's picture
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Joined: 2021 Feb 11

But if I remove the cdrom drive from its chassis, could I also connect it internally using the 50-pin scsi idc cable?

What exactly do you mean by CD-R?

Thank you
G.

PS: Does this cdrom drive need drivers to work?

MikeTomTom's picture
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But if I remove the cdrom drive from its chassis, could I also connect it internally using the 50-pin scsi idc cable?

What exactly do you mean by CD-R?

If the ribbon cable from the internal SCSI port on the motherboard fits into the rear connector of the CD drive, I don't see why this would not work. Although I think it would also need to be terminated on the drive too, before it would work.

CD-R = Recordable CD media. CD's that have been burned by yourself or others. My experience with these early Apple drives was that they will not be mountable. It may work for you, but I'm not certain of this. And for me it was not an option.

sfp1954's picture
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Joined: 2013 Dec 29

RE: Drivers. It depends what OS you are using.
CD drivers were built into the OS from 7.5 on.

adespoton's picture
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If it's not built-in by default, I found back in the day that FWB CD-ROM Toolkit's driver worked for every CD-ROM drive I threw at it.

GianDO's picture
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I have connected the external drive to both an LC III and a PowerMac, but they don't seem to recognize it. Only the green LED remains lit, indicating that the external drive is on and nothing else. Even the button to eject the caddy seems not to work, I don't know if need drivers for this or it's just broken ....

sfp1954's picture
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Is the cabinet properly terminated and set to ID=3?

GianDO's picture
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Cabinet set to ID=2 end it is terminated.

However regardless of the setting, if I press the caddy button it should still eject it, right?

slomacuser's picture
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I would say recap first and then troubleshot..

sfp1954's picture
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If it is tray load - yes it should eject.
It's quite possible that the little drive belt that opens the drawer has broken or fallen apart by this point in time. So that would be the first thing to check on my list.

GianDO's picture
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This cdrom drive doesn't have a drawer, but it has a caddy and I don't think I've seen any belt ..

In this cdrom drive the ejection of the caddy takes place electronically and not mechanically, even if it would also have a mechanical emergency ejector (working).

adespoton's picture
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Joined: 2015 Feb 15

I used to have one like that. Pressing the eject button would electronically trigger a solenoid release that would open the flap and stick the caddy out the door about a centimetre, and then you'd pull it the rest of the way. The paperclip hole let you override if it was jammed inside, and manually opened the flap and pushed the caddy into the slightly-ejected position.

If you aren't getting it to there when pressing the button, check and see if the wires are connected properly inside the bezel. If they are, you could have a broken solenoid.

GianDO's picture
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If the solenoid is broken, is it possible to replace it?

adespoton's picture
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If you can find a comparable part, and your soldering and mechanical skills are up to the task, yes.

That said, your drive may be configured slightly differently than mine. After ensuring the manual eject works, check the spring first that should tighten when the caddy's inserted. If that's broken or missing, then it's a cheaper/simpler fix.

The only issues are likely to be with the mechanical parts though; there's not much electronic to do with ejecting, other than the initial signal.

GianDO's picture
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Thanks for suggestions.

Manual Eject work fine

sfp1954's picture
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I wouldn't expect a caddy load to be working at this point in time.
Better off to find a bare SCSI tray load to put in the external case.

Have you checked the 5 and 12 volt leads to the drive for correct voltages?

GianDO's picture
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I cannot replace with any other cdrom drive in this chassis as it is customized for the original device.

To do a test I tried to connect the device internally using the computer power supply and the problem is the same ..