Mask ROM serial numbers ======================= Quick summary: PB01 - BASIC I PD11 - VIEW 2.1 PB02 - OS 0.10 PD93 - TFS 1.00 PB04 - OS 1.20 PE02 - DNFS 3.00 PB05 - BASIC II PN66 - OS 2.00+BASIC II PC05 - VIEW 1666 - DNFS 3.00 PC06 - VIEW 427-01 - ADFS 1.00 PC15 - BCPL 274-02 - ADFS 1.30? PC23 - Electron 2201 - MOS 3.20 MegaROM Detailed information -------------------- HN.......... - Hitatchi ROM ..613....... - 250ns max speed mask ROM .....128.... - 16K*8bit=128Kbit ........P... - Programmed YR............... - Year ..WK............. - Week -------------------------------------------------------------- 1M1 HN613128PB01 - BASIC I 2K1 HN613128PB02 ACORNOS-1 - OS 0.10 HN613128PB03 - "strongly suspected" to be OS 1.10 HN613128PB04 ACORN COMPUTERS LTD - OS 1.20 8302 HN613128PB05 ACORN COMPUTERS LTD - BASIC II 8335 HN613128PC05 VIEW (C)ACORNSOFT - View HN613128PC06 - View 8317 HN613128PC15 BCPL (C)ACORNSOFT - BCPL 8426 HN613128PD11 VIEW2.1 (C)ACORNSOFT - VIEW 2.1 HN613128PD53 8421 HN613128PD93 ACORN COMPUTERS LTD - TFS 1.00 4G1 HN613128PE02 ACORN 00201666-01 - DNFS 3.00 HN613128PE82 HN613128PO11 Others seen: 3A1 HN613128PB21 Sinclair - ZX Spectrum ROM 3D1 HN613128PC07 ORIC BASICV1.0 - Oric MOS+Basic v1.0 3J1 HN613128PC97 ORIC BASICV1.1 - Oric MOS+Basic v1.1 VA............... - VLSI ........23....... - Mask ROM ..........128.... - 16K*8bit=128Kbit -------------------------------------------------------------- 445 VA 5166 23128-1255 (C)ACORN 0201 427-01 - ADFS 1.00 (Electron) 503 VA 5975 23128-1272 (C)ACORNSOFT 1201,387-01 503 VA 5623 23128-1273 (C)ACORNSOFT 1201-388-01 507 VA 5447 23128-1271 (C)ACORN 0201,274-02 - ADFS 1.30? Also seen: -------------------------------------------------------------- ............................YR.... - Year ..............................WK.. - Week CN61014N 00201666-03 ACORN KK8443-X - DNFS 3.00 00201685-01 BBC Hi-BASIC 3 YR................................ - Year ..WK.............................. - Week AMI 8648IDI 201666 ACORN LTD C14887 - DNFS 3.00 AMI 8648IDJ 201666 ACORN LTD C14887 - DNFS 3.00 ...128........... - 16K*8bit=128Kbit -------------------------------------------------------------- 9128DS-0294 B05 (C)ACORN COMPUTERS LTD 8529CDA GI TAIWAN - BASIC II VH.............. - VLSI .......23....... - Mask ROM HN.......... - Hitatchi ROM ..613....... - 250ns max speed mask ROM .....256.... - 32K*8bit=256Kbit ........P... - Programmed YR............... - Year ..WK............. - Week -------------------------------------------------------------- 8448 HN613256PN66 (C)ACORN 0201 241-01 JAPAN - OS 2.00+BASIC II 448 VH 4996 23256-1109 (C)ACORN 0201,241-01 KOREA-A - OS 2.00+BASIC II Others seen: 27256-25/PO63 - ZX Spectrum 128 ROM 'Toastrack' VM................. - VLSI VH................. - VLSI 23......... - Mask ROM ..1024..... - 128K*8bit=1024Kbit Year - YR.. Week - ..WK -------------------------------------------------------------- 603 VM 9482 231024-1028 0201,843-0 (C)ACORN SING-T - MOS 3.20 with inverted A14/A15/A16 621 VH B464 231024-1031 (C)ACORN 2201,239-01 KOREA A - MOS 3.20 746 VM K4631 231024-1094 0277-022-03 (C)ACORN 1987 - Arthur 1.2 ROM 0? 746 VM K4421 231024-1083 0277-023-03 (C)ACORN 1987 - Arthur 1.2 ROM 1 746 VM K4621 231024-1084 0277-024-03 (C)ACORN 1987 - Arthur 1.2 ROM 2? 0243,940-01 (C)ACORN 1989 M128 ROM V3.50 8936 E - MOS 3.50 A lot of other ROMs tended to be supplied on EPROM, and other mask ROMs (eg DNFS) used serial numbers with a different sequence (eg 00201666-03 is DNFS 3.00). 00201666-03 is DNFS ROM for BBC 00201685-01 is BBC Hi-BASIC 3 ROM for the BBC A or B Other devices: VLSI 9021AV 133182 2069-0001 201647 (C)ACORN COMPUTER - BBC Video ULA VLSI 9227AV 245011 2026-0001 201648 (C)ACORN COMPUTER - BBC Serial ULA VLSI 8929BV W8445 2026-0001 201648 (C)ACORN COMPUTER -