5415426 CPU, Floppy, Printer:
Program         Socket? Site    Type    Description
23-008M1	N	E27	8051	Disk Interface
23-114E4	N	E173	2764	Character Generator
23-358E2	Y	E113	2716	unused (obsolete)
23-359E2	Y	E114	2716	unused (obsolete)
23-360E2	Y	E115	2716	unused (obsolete)
23-640A2	N	E13	256x4	Floppy
23-390E2	Y	E113	2716	unused (obsolete)
23-391E2	Y	E114	2716	unused (obsolete)
23-392E2	Y	E115	2716	unused (obsolete)
23-399E2	Y	E113	2716	2Kx8 ROM
23-400E2	Y	E114	2716	2Kx8 ROM
23-401E2	Y	E115	2716	2Kx8 ROM

The firmware self-identifies with different version numbers:
31Z/3732	Old boards, graphics not upgradable, no hard disk
18K/2213	Prototype hard disk support
19H/2310	Common, some bugs.
19N/2316	Fixed, best version.
The relationship of the software version to the hardware part numbers
is unclear.

ROM part numbers for the option cards also need to be explored.
5015450 APU option:
23-366E2	Y		2716	Z80 APU Firmware