VT78 ROM Listing is in MP00468_VT78_oct79.pdf on bitsavers. VT78 CPU, Floppy, Printer: Program Socket? Site Type Description 23-418A2 N E45 256x4 tri-state 23-001G1 N E63 6312 CP ROM, RX01 only 23-003G1 N E63 6312 CP ROM, RX01 only 23-005G1 N E63 6312 CP ROM, RX01/RX02 23-197A1 N E88 32Kx8 tri-state 23-213A1 N E109 32Kx8 tri-state 23-419A2 N E112 x4 23-199A1 N E113 x8 23-200A1 N E129 x8 23-420A2 N E143 256x4 tri-state 23-201A1 N E164 32Kx8 tri-state 5412861 I/O Distribution Panel: Program Socket? Site Type Description 23-439A2 N E5 256x4, Baud Rate Selection 5411743 VT52: Program Socket? Site Type Description 23-119A9 N E29 512x4, VT52, Copier 23-120A9 N E26 512x4, VT52, Copier 23-121A9 N E37 512x4, VT52, Copier 23-122A9 N E21 512x4, VT52, Copier 23-124A9 N E29 512x4, VT52, Printer 23-125A9 N E26 512x4, VT52, Printer 23-126A9 N E37 512x4, VT52, Printer 23-127A9 N E21 512x4, VT52, Printer 23-128A9 N E37 512x4, VT55 23-129A9 N E29 512x4, VT55 23-130A9 N E26 512x4, VT55 23-131A9 N E21 512x4, VT55 23-132A9 N E29 512x4, VT51 23-133A9 N E26 512x4, VT51 5411815 Character Generator: Program Socket? Site Type Description 23-002B4 Y E1 2608 512x4, VT52, Copier 5411985 Language Roms: Program Socket? Site Type Description 23-014B7 Y E3 2708 French (optional) 23-026F3 Y E3 2708 British (optional) DP78 Communications Option doesn't seem to have any ROMs. MR78 ROM Board has sockets for 16 6353 ROMs. Information about the contents of the various ROM kits was not found. In-Floppy RX01 controller listing in M7726 RX01 Floppy Drive: Program Socket? Site Type Description 23-111A2 N E13 256x4 FLD 0 L 23-421A2 N E3 256x4 FLD 0 H 23-257A2 N E14 256x4 FLD 1 L 23-258A2 N E4 256x4 FLD 1 H 23-115A2 N E15 256x4 FLD 2 L 23-116A2 N E5 256x4 FLD 2 H 23-117A2 N E16 256x4 FLD 3 L 23-118A2 N E6 256x4 FLD 3 H 23-259A2 N E17 256x4 FLD 4 L 23-260A2 N E7 256x4 FLD 4 H 23-121A2 N E18 256x4 FLD 5 L 23-122A2 N E8 256x4 FLD 5 H In-floppy RX02 controller uses 4 7643 ROMS, socketed, contents unknown. Possibly others (no proper parts list found).