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serial upload from lc575

Submitted by nickn on October 7, 2004 - 11:06am. 680x0 Macs and Lisa

Mum's tired old LC575, running system 7.5, has a broken floppy drive and a broken modem, and she wants me to get a few hundred pages of typed text off it.

I am trying to make a serial connection to my PC, using the parellel port - Clarisworks looks like it can do it, making a serial connection through the parallel port, and using the Xmodem transfer protocol... but everytime I connect up the serial cable, the Mac freezes.

With hardware I'm not really sure what I'm doing, I have tried a 25pin - 9 pin serial cable, and also a serial to parallel converter device - both make the Mac freeze.

I looked at the voltages on the Mac's parallel port, they seem to be all around 2.8V - maybe this is the problem as RS232 should be +/-10V...

Does anyone know the simplest solution here?

Thanks

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Jon's picture

The Mac printer port is not a

Submitted by Jon on October 7, 2004 - 8:53pm.

The Mac printer port is not a parallel port, it is serial. You will have to use a null modem adapter and a serial cable to the PC. Or, if you happen to know where to find one easily you might be able to stick in an LC PDS ethernet card. I'd check that there are the ethernet drivers already installed first though.

But, the Mac definatly can't go printer port -> PC parallel port any easier that it is to just do it over serial.

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Still a bit confused...

Submitted by nickn on October 8, 2004 - 12:03am.

Mac printer port - you mean with the DB25? That's what I was referring to. I am trying to use it as a serial port, connecting to the serial port on my PC, but with the serial cable that I got it makes the mac freeze when I plug it in.

I have a serial cable 25pin one end 9 pin the other, should I connect that to a null modem cable then to my PC serial port?

Are the voltages the same? I couldn't find +/-10V on the 25pin D connector on the mac.

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Eudimorphodon's picture

Re: Still a bit confused...

Submitted by Eudimorphodon on October 8, 2004 - 1:21am.
nickn wrote:
Mac printer port - you mean with the DB25? That's what I was referring to.

There's your problem. That 25 pin port on the back of the Macintosh isn't a parallel *or* a serial port. It's a SCSI port. For hard disks and whatnot.

The Mac's serial ports are the small round ones that look like PS/2 keyboard ports. (Like the port the keyboard plugs into, but different pinout.)

--Peace

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RS232 then?

Submitted by nickn on October 8, 2004 - 9:01am.

Ah, ok, thanks.

So is the Mac serial port RS232 standard? Do I just need an adapter plug?

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-Wallstreet-'s picture

Yes.

Submitted by -Wallstreet- on October 8, 2004 - 11:29am.

Yes.

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