I know the M24 since 29 years, I have service manual, circuit diagrams and functional description ("M24 - Theory of Operation" - it describes the machine down to TTL logics/GAL listing level) and so on. This is my 3rd M24, the first one which works fully properly. A 2nd can not read any floppydisk (drives swapped, no change) and the 3rd has broken powersupply. I have also other Olivetti PCs: M19, ETV 260, ETV 2700, M380XP1 (powersupply broken), LSX-5020 (486-EISA machine, currently dismantled for recostruction, ODIN RTC chip battery repair). I already tryed 8088MPH on both ETV MS-DOS based videotypewriters, with mixed success...
M24 and it's derivates (Xerox 6060, AT&T 6300, Logabax Persona 1600) are IMHO some the most beautyfull IBM XT clones ever, but that ATARI PC3 is als quite nice. Maybe that's because it has very similar sized chassis as the M24. That PC3 will help me a lot, currently it is the only machine I have which can handle 5,25 and 3,5 inch floppy drives (it's possible to connect an ATARI SF 314 external 720 kB floppy drive from ST series to it).