I recently bought some old apple hardware for my sister : a LC 475 (HD 80 Mbytes, RAM 20 Mbytes), a "genial" apple greyscale portrait screen, a stylewriter 2400 and an external cdrom 600e mostly to install all the software to use it properly.
It runs now macos 7.5 and i would like to install 7.5.3 and even 8.1 if it can support it with only 20 Mbytes of RAM.
So i need the cdrom to install : there's a problem. When I insert any cd in it, nothing appears on the screen ... Any idea ???
The 600e runs properly with other macs ...
Can it be the scsi card in the Lc 475? How can test it ?

Thanks in advance ...

CCA

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Mac OS 8.1 will run fine with 20MB of RAM, although 7.5 will be much faster. You can use SCSIProbe to see if the drive is actually there. You also might need to install the CD-ROM drivers if they're not already installed.

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But yeah, you have a very nice setup there, and OS 8.1 will run fine. I ran my LC475 with 20 megs under 8.1 for ages, until i ended up with a 32 meg SIMM, which promptly went straight into the 475.

CCA

as for the scsi logo with #2 bouncing round your screen, my guess is the cable that you have a is a SCSI disk mode cable, which is a cable that allows you to use your powerbook as an external hard drive to another desktop mac. google round for scsi disk mode. I know that it involves turning off both machines, and starting them, with some key pressed on the PB. with any luck, you should be in scsi disk mode, and see your powerbook's hard drive on your desktop mac as if it was an external hard drive. The #2 is saying that your powerbook is on scsi id 2. you can change this (if you can ever boot) in one of the powerbook control panels.

SCSI disk mode is very cool, if you know what you are doing.

in the meantime, you need a new scsi cable for connecting periphery.

CCC
CCC

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ok, you can run 8.1 on 20mb of RAM, just spend the extra time to compile various sets of different extentions for when you have different situations, ie, periphery. I ran 8.1 on a duo 2300c with 8megs of ram. it ran like molassass in january, but it did not do well.

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Yes, the powerbook is going into SCSI Disk Mode (or "Target Mode" as it's called now) because of the cable used, or, if it has a switch then it's on the wrong setting.

But I don't recall having to hold down a key on the old powerbooks, only the new ones that have firewire, you have to hold down the "T" key.

BTW, OSes will work with less than the "minimum" amount of RAM if you install them onto a machine with the correct amount of RAM and then shutdown and remove some RAM. The OS should automatically increase the Virtual Memory settings to compensate. Don't forget RAMDoubler v1 or v2 is useful in situations like these.

If you have the SCSI Dock connector (the small L-shaped one) you can use it with any SCSI peripheral.

If, on the other hand, you have a short cable adapter that goes to SCSI then you can only use that for what's called SCSI Target Disk Mode. This cable forces the powerbook to act as though it's an external SCSI hard drive to any computer that it's attached to. This action is just like the feature on the newer Apple laptops, called Firewire Target Disk Mode.
You can use the Powerbook Setup Control Panel to choose the SCSI ID for your powerbook.

If you're having problems with using a CD-ROM with the dock connector, make sure you have the extension called Apple CDROM or something to that effect.

I'm using an AppleCD 150, set to SCSI ID 7.

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