3.5" Floppy NEC 1148H with jumpers \ VOGONS

3.5" Floppy NEC 1148H with jumpers

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First post, by gras

Posted on 2024-11-02, 22:24

gras Offline

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Rank: Newbie
Posts: 14
Joined: 2021-02-25, 06:55

Just wanted to share with you my findings on a NEC 1148H floppy drive with jumpers. When using in a AT or ATX PC:

There are 8 pins that can be jumped in pairs between the power and 34 pin FDD connector.

The jumper should be jumping the 2nd pair of pins counting from the side FDD connector (see pictures). In this setting the drive will work both as A-drive and B-drive.

Also pin1 is at the edge of the drive, not towards the center, even if the notch in the circuit board indicates otherwise (at least for my FDD cable). I spent a lot of time on different PC's assuming that my FDD cable was placed correctly in the connector, because of this notch, don't do this 😀

I attached pictures of correct cable orientation and jumper placement, hoping it will help someone:

Drive A:
file.php?mode=view&id=204894

Drive B:
file.php?mode=view&id=204895

The treacherous notch:
file.php?mode=view&id=204896

Reply 1 of 1, by gras

Posted on 2024-11-02, 22:32

gras Offline

Rank Newbie

Rank: Newbie
Posts: 14
Joined: 2021-02-25, 06:55

Note: If someone wonders about the last picture that shows the notch: I know it doesn't have the jumpers. It's not the same drive, but it shows the notch. The drive with the notch and jumpers are safely in one of my rigs now, so don't bother to pull it out to show the notch on it.

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