The manual for the PK-88 is a great help when trying to figure the thing out, but the problem is that I have yet to find a searchable version. The manual I’ve been referencing has been a PDF that was never passed through an OCR program to convert it to text that can be searched.
I ran the PDF file through FreeOCR, hoping that it would help. Unfortunately the output was quite garbled and is difficult, at times, to read. None the less, I now have a copy that I can search and possibly find things. This should still be helpful when looking for command references and setting parameters.
In case anyone is interested, I have posted the converted copy below in both txt and rtf formats, as well as the original PDF. If you find this helpful please let me know.
73 de VE1DCD