Usagi Electric has a video series[1] about investigating MC14500B (with help from Ken) and recreating it on a bread board. Later this led to him developing a variation on MC14500B using vacuum tubes[2].
Do you mind reporting this over at https://bugs.ghostscript.com/ ? I work on MuPDF myself, but I'm sure my colleagues working on Ghostscript would want to have any differences fixed. Thank you! :)