This all-in-one device, the successor to the SJ-9100, throws together an eclectic mix of hardware: a dot matrix printer, a DVD drive, a touchscreen, and dual SSDs, all running on ...

For my writing and productivity computer, I chose an old Toshiba Satellite Pro of uncertain provenance. After replacing the CMOS battery, it booted into Windows 10—but only after about 20 minutes.

He designed a PCB with several DC/DC converters that fit easily inside the computer’s case, leaving enough space to add a battery. This made the old Toshiba more portable than it ever was ...