@nina_kali_nina From the look... is this an IBM manual, mid '70s? It reminds me of the manual series for the 5100-series machines. The main thing leading me to doubt is the exclamation point.

@stepleton this one is SHARP from the 80s; the "service manual" part of it even has a bit of Japanese (by mistake?)

@nina_kali_nina Is this from the TRS-80 Pocket Computer manual? That line was rebadged Sharp computers.