CD-Sunrise 2.2c and CDROM

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Level 1

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CD-Sunrise 2.2c and CDROM

Hi,
I've got a new SCSI generic CD-ROM player, a Matshita, tested with my PC SCSI card. It's set as SCSI ID 6.

Now I want to install it on my Mac Plus. I've connected the SCSI cable from HD to Mac and another Centronics+Centronics cable from CD-ROM to HD. The CD-ROM other SCSI connector is covered by a SCSI activator.

I've installed the CD Sunrise 2.2c extension in my Mac Plus System 6.0.7, but always, at the startup, the driver put a cross on the icon. Of course, no CD-ROM is recognized.

I also tried to run a floppy containing a mini-System 7.0.1 with just the driver loaded, but always I see the cross on the icon.

I just want to specify I had another CD-ROM player in the past (original Apple) and some other extension like "Apple CD Player", "ISO file access" and "Audio CD file access" are loaded in my system hard disk.

Of course, I tried to change the SCSI ID - I tried 6, 3 and 1, but nothing changes.

What is wrong?

Thanks!
DG

Mac Plus, Mac OS 8.6 or Earlier, Hard Disk 40Mb, CD-ROM SCSI device, external floppy

Posted on Oct 4, 2009 10:07 PM

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Answer 1

Jan Hedlund

Level 7

24,235 points

Oct 5, 2009 11:54 AM in response to davideg67

Hi DG,

The ID per se should be OK (see, for example, the text about CD-Sunrise 2.2c here), but it cannot be ruled out that the extension does not support the CD-ROM drive in question at all.

SCSI termination is not always an exact science. Have you tried different cables and other relative positions for the units involved? It can sometimes be worth experimenting with a terminator placed elsewhere (perhaps even without one).

It would not be a bad idea to remove any existing CD-ROM files before the tests.

Jan

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Answer 2

Oct 5, 2009 2:57 PM in response to Jan Hedlund

Do you know for certain that your Hard drive is NOT terminated? Drives of that era had a set of SIP or DIP resistors in a socket near the SCSI connector on the drive's circuit board.

Does the Hard Drive work by itself with the same SCSI Terminator applied to its second connector and no CD Drive?

Are your cables intended for use with SCSI devices? and not, say, RS232 cables or printer cables?

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Answer 3

davideg67 Author

Level 1

0 points

Oct 6, 2009 7:56 PM in response to Grant Bennet-Alder

Hi,
I've tried to use the same cable used with the original Apple CD-ROM drive, stopping to work some time ago.
I've also tried to install CD-ROM and run system from a floppy (a mini 7.01 system with the only driver extension) without connecting the system's hard disk, as the CD-ROM seller told (he sent the floppy with the mini-system too).

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Answer 4

Oct 7, 2009 5:09 AM in response to davideg67

The Macintosh Plus does NOT supply Termination Power, so your external drives should be set to supply Term Power to the SCSI Bus.

The external Apple CD-ROM unit has a strap on the Matsushita drive itself that is set to provide Term Power. That strap should be set on your replacement drive as well. Without that strap, the external Terminator cannot do its job.

It would also be a good idea to set the Term Power strap for your external Hard Drive.

Termination Power connects 5 Volts from the drive onto the SCSI Bus signal reserved for it. The 5 Volt power on the cable is used by the external Terminator to reduce noise and quiet the Bus when idle.

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