I'd be hesitant to use the keyboard plug to pull 1A of current. Seems like a recipe to blow a mainboard fuse.

edit: adding all the text so the search engines can have some fun.

SSI Computer P-IDE (HDD & CD-ROM) software driver (Shuttle Manager v2.17d) […]
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SSI Computer
P-IDE (HDD & CD-ROM) software driver
(Shuttle Manager v2.17d)

Made in Taiwan
Copyright (c) Shuttle Technology LTD

---
M P H
Mobil Pocket HDD
The World's Smallest Pocket Hard Disk
EPP P-IDE

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Diskshuttle CE
Portable Disk System
Model No:SI-500 FCC
FCC ID:
MK6SI10SI5009500
Power Requirements
DC+5v, 1A regulated
by A.C. adapter or
keyboard Power Cable

Warranty void if opened
by unauthorised service
engineer.

weedeewee wrote on 2023-10-20, 19:38:

I'd be hesitant to use the keyboard plug to pull 1A of current. Seems like a recipe to blow a mainboard fuse.

But people came up with this miracle of engineering, albeit with such a problem as a blowned fuse. I want to understand what it is and why ...

It's likely a laptop harddrive in an enclosure that houses an interface which connects to the parallel port and allows for a printer to be connected as well.
Going off on the name it also likely supports an EPP parallel port which should allow for 'fast' transfer speeds if your laptop/computer sports an EPP supporting parallel port.

EvilCPU wrote on 2023-10-20, 19:48:

weedeewee wrote on 2023-10-20, 19:38:

I'd be hesitant to use the keyboard plug to pull 1A of current. Seems like a recipe to blow a mainboard fuse.

But people came up with this miracle of engineering, albeit with such a problem as a blowned fuse. I want to understand what it is and why ...

Product - see (foot of page) at https://web.archive.org/web/19970113125555/ht … .com.tw/epp.htm

Driver - see (top one) at https://web.archive.org/web/19970113130511/ht … .tw/drivers.htm