It could be scsi.

Could be null modem.

Could be laplink.

Could be fastlynx.

Could be straight through.

You'd need to probe the pins (all of them) for continuity with a multimeter to know.

ok but if they were scsi what kind of connection should I expect?

http://antinode.info/mac/scsi_25.html

wierd_w wrote on 2025-04-18, 18:18:

http://antinode.info/mac/scsi_25.html

thanks but mine is 25 to 25 pin, how can i use your suggestion? (25 to 50) i not understand sorry

From what I'm reading, 25 to 25 is straight through.

If it is 25:25 straight wired it can be used for SCSI.
But I won't try Ultra SCSI over it.

For something like a zip or jazz drive it should be fine.

There's no way to use wide scsi on that cable, but slow narrow should work fine.

wierd_w wrote on 2025-04-18, 19:27:

For something like a zip or jazz drive it should be fine.

There's no way to use wide scsi on that cable, but slow narrow should work fine.

Yes, i like to connect an external scsi ZIP drive to an Commodore A590 scsi controller OR to an Blizzard SCSI KIT used in a Blizzard 1230IV and Blizzard 1260 for Amiga 1200.

OR

Connect an external scsi ZIP drive to a Macintosh SE (that have an external scsi connector)

AlessandroB wrote on 2025-04-18, 19:38:

Yes, i like to connect an external scsi ZIP drive to an Commodore A590 scsi controller OR to an Blizzard SCSI KIT used in a Bliz […]
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wierd_w wrote on 2025-04-18, 19:27:

For something like a zip or jazz drive it should be fine.

There's no way to use wide scsi on that cable, but slow narrow should work fine.

Yes, i like to connect an external scsi ZIP drive to an Commodore A590 scsi controller OR to an Blizzard SCSI KIT used in a Blizzard 1230IV and Blizzard 1260 for Amiga 1200.

OR

Connect an external scsi ZIP drive to a Macintosh SE (that have an external scsi connector)

Yes, that should work with that cable if it is as you state 25 to 25, a straight through, all pins one on one connected .

Given a jumper box, a 9 to 25 converter and a gender changer it can also be used for null modem, laplink, or full serial dte to dte, dte to dce etc... just an fyi.