On May 25, 16:07, Rod Young wrote: It's one EPROM, number 23-261E6. It's a 27C256. Still on the subject of DEC ROMs, as some list members know, I keep images of the ones from boards I have, "just in case", and I have a puzzle. What are 23-398E4 and 23-399E4 from? And another: what ROM goes with 23-116E5 to make the pair? And for the sake of completeness (of a sort) here's a list of ROMs (images) I'm looking for: 23-031E2 VT100 terminal ROM 23-051L1 TQK50 Rev.D1 E3 ROM 23-094E2 VT100 extra chargen 23-095E2 VT100 extra chargen 23-096E2 VT100 extra chargen 23-097E2 VT132 extra chargen 23-098E2 VT132 extra chargen 23-116E5 KDJ-11B (PDP11/73+) boot Version 7 23-116E5 KDJ-11B (PDP11/73+) boot Version 7 [one of the last two lines is obviously a misprint, see above] 23-139E2 VT100 terminal board ROM 23-140E2 VT100 terminal board ROM 23-158E4 early KDF11-BE boot ROMs 23-159E4 early KDF11-BE boot ROMs 23-170E5 TQK50 ROMs, rev.1 23-171E5 TQK50 ROMs, rev.1 23-178E5 RQDX2 T-11 code, issue 1 (V10.0D) 23-179E5 RQDX2 T-11 code, issue 1 (V10.0D) 23-180E2 VT132 terminal board ROM 23-180E5 TQK50 ROMs, rev.2 (C1) 23-181E2 VT132 terminal board 23-181E5 TQK50 ROMs, rev.2 (C1) 23-183E2 VT132 terminal board 23-216E5 RQDX3 T-11 code issue 1 23-217E5 RQDX3 T-11 code issue 1 23-238E4 KDF11-BE (?PDP11) Boot 23-239E4 KDF11-BE (?PDP11) Boot 23-380E4 KDF11-BG (uPDP11/23) boot 23-381E4 KDF11-BG (uPDP11/23) boot 23-451E4 DELUA ROMs 23-452E4 DELUA ROMs -- Pete Peter Turnbull Network Manager University of York