I’ve added a document about IC38, the HAL chip in a QL to the hardware documents page on my site.

A document with equations and JEDEC for the HAL chip in a QL (based on issue 5.3 and 6), from information by Robert Klein in the original document QL_clones_hardware.pdf , with small modification by Marcel Kilgus (fixed pin names)  and JEDEC listing from Miroslav Werner, originally published on Sinclair QL For Everyone Facebook Group. Read the article at http://www.dilwyn.me.uk/docs/hardware/HALic38.txt