I'm trying to determine what the operating system is of some 8" floppies I'm trying to read. I found the directory on track 2 but it's not CP/M, and it's not DOS. It looks CP/M-ish, but the offsets of the file entries are not right. Anadisk says this is a high density disk, sector IDs 1-26 on side 0 and 27-52 on side 1, 256 byte sectors. I see this string in the first track: Type <CR> to load system. Some extra context around this string: 0000100: 3100 303a 0b00 b7f2 a034 3a8d 4811 363b 1.0:.....4:.H.6; 0000110: 123a 0600 4fcd 30f8 0120 4e0b 78b0 20fb .:..O.0.. N.x. . 0000120: 3a07 00c6 3132 7335 016d 35cd 243b 0171 :...12s5.m5.$;.q 0000130: 35cd 243b 0144 3bcd 243b 2144 3b22 d13d 5.$;.D;.$;!D;".= 0000140: c37b 3531 0030 3a07 00c6 3132 7335 0171 .{51.0:...12s5.q 0000150: 35cd 243b 21d3 3de5 01ca 3dcd 063b fe03 5.$;!.=...=..;.. 0000160: ca46 35fe 7fca 4635 fe08 ca46 35fe 15ca .F5...F5...F5... 0000170: 4635 fe18 ca46 35e1 7723 e53a ca3d fe0a F5...F5.w#.:.=.. 0000180: 20d6 d121 d43d afed 5221 d33d 200b 0144 ..!.=..R!.= ..D 0000190: 3bcd 243b 2144 3b18 2801 7835 cd24 3b3a ;.$;!D;.(.x5.$;: 00001a0: d43d fe3a 201b 3ad5 3dfe 21f2 4135 3ad3 .=.: .:.=.!.A5:. 00001b0: 3dd6 31fa 5c39 fe04 f25c 3932 0700 c3c3 =.1.\9...\92.... 00001c0: 3422 d13d 1835 0177 35cd 243b c3c3 340d 4".=.5.w5.$;..4. 00001d0: 0a54 7970 6520 3c43 523e 2074 6f20 6c6f .Type <CR> to lo 00001e0: 6164 2073 7973 7465 6d2e 0d0a 7f7e 1c1a ad system....~.. 00001f0: 7f0d 0a31 3e20 7f23 0d0a 7faf 32a2 3bed ...1> .#....2.;. 0000200: 5bd1 3dcd 6736 c457 39cd 9c37 cdc8 37e6 [.=.g6.W9..7..7. 0000210: fec4 5239 2a9d 3b22 f138 3e01 32f0 3821 ..R9*.;".8>.2.8! 0000220: a53c 22f3 38cd 0339 2aa5 3c7d b7c4 5239 .<".8..9*.<}..R9 0000230: 24c4 5239 2aa7 3c22 cd3d 1100 f0af ebed $.R9*.<".=...... (I haven't taken a stab at trying to determine what CPU these instructions are for. This is from the second sector read off the first track.) More strings: Opr= H Trk= H Sec= H Rec= H Cmd= H Sts= ? Drive not ready [Drv= ? Disk I/O error [Drv= ? Illegal disk address [Drv= ? Load address error ? Not a system exec file ? System file not found ? Illegal device name ? Illegal file name SYSTEM.IMF I found what looks to be an allocation table at the 17th sector of the first track: 0001000: ffff ffff ffff ffff ffff ffff ffff ffff ................ 0001010: ffff ffff ffff ffff ffff fff0 3fff f7ff ............?... 0001020: ffff ffff ffff ffff ffff ffff ffff ffff ................ 0001030: ffff ffff ffff ffff ffff ffff 8fff ffff ................ 0001040: ffff ffff ffff c07f ff9f fe01 ff1f ffe0 ................ 0001050: 0800 0f82 0001 ff00 03ff e3fe 0000 00ff ................ 0001060: ffff fff0 3fff ffff ffff ffff fffe 87ff ....?........... 0001070: ffff ffff ffff fff8 0fff ffff fff7 ffff ................ 0001080: 1fff fe80 3fff ff8f ffff ffff ffff ffc3 ....?........... 0001090: ffff fff0 0000 f000 ffff 803c 1fff ffff ...........<.... 00010a0: ffff ffc7 fff9 ffff ffe7 ff8f ffff fff8 ................ 00010b0: 0000 7e08 0fff fffe 07fe 000f fc00 b07c ..~............| 00010c0: 1fff ffff e1ff fde8 0f3f 03ff ffff ffff .........?...... 00010d0: ffff fff0 3fff f807 ffff 3fff ffff f1ff ....?.....?..... 00010e0: ffff ffff ffff 80fe 7cfe 7fff ffff 0e00 ........|....... 00010f0: 01fe 0efe 3e7f ff80 0ff8 0fc0 0000 fef6 ....>........... 0001100: 3fff ffff ff00 00ff f83e 7ffc 3fff f9fd ?........>..?... 0001110: fe1f ffff e07c ffff fffd c000 3f00 0000 .....|......?... 0001120: 000f e3e7 ffff fc0f ffff dcff fe3f fc30 .............?.0 0001130: 7f0f fc01 e3e7 f800 0000 03ff 7e3f ffc0 ............~?.. 0001140: 0000 0fff ffff ffff fff1 feff ffe7 f07e ...............~ 0001150: 007f fff8 160b 3fc0 3fff fff0 1fff ffff ......?.?....... 0001160: 0781 ffff ffff 1fff ffdf c7e8 03ff ffc0 ................ 0001170: 0e00 9fff ffbf ffff f7ff e0ff ffbf fe00 ................ 0001180: 033f c01f ffe3 ffbf e7f0 003f c3fd ffff .?.........?.... 0001190: ffc1 ff9f ffff ffff ffff fe00 000f ffff ................ 00011a0: e3c0 7ee0 0000 1f3f c1ff ffff 000f ffff ..~....?........ 00011b0: ffff fff8 3f87 ffff fff0 ffe3 ffff ffff ....?........... 00011c0: fff8 ffff ffff ffe3 f000 07ff e783 ff80 ................ 00011d0: 7fff ff7f ffff ffff c3ff ffff ffff fffc ................ 00011e0: ff87 ffff c000 0000 0000 0000 0000 0000 ................ 00011f0: 0000 0000 0000 0000 0000 0000 0000 0000 ................ Sector 21 has the volume label: 0001400: 8080 004d 4953 432e 2044 4953 4b20 2331 ...MISC. DISK #1 0001410: 3020 2020 2020 2020 2020 2020 2020 2020 0 0001420: 2020 2020 2020 2020 2020 2000 0000 0000 ..... 0001430: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0001440: 0000 0000 0000 0000 0000 0000 0000 0000 ................ Here are the first two directory sectors: 0001a00: be00 424f 4f54 0000 0000 0000 0000 494d ..BOOT........IM 0001a10: 46a7 0010 0000 0000 0000 1001 0000 0000 F............... 0001a20: be00 5341 5400 0000 0000 0000 0000 494d ..SAT.........IM 0001a30: 46a5 0004 0000 0000 0000 0411 0000 0000 F............... 0001a40: be00 4c41 4245 4c00 0000 0000 0000 494d ..LABEL.......IM 0001a50: 4631 0006 0000 0000 0000 0615 0000 0000 F1.............. 0001a60: be00 4449 5245 4354 4f52 5900 0000 494d ..DIRECTORY...IM 0001a70: 46a5 0082 0000 0000 0000 821b 0000 0000 F............... 0001a80: be00 4944 3832 3600 0000 0000 0000 0000 ..ID826......... 0001a90: 0000 b107 0000 001d 1500 0701 0300 0000 ................ 0001aa0: be00 4944 3832 3700 0000 0000 0000 0000 ..ID827......... 0001ab0: 0000 f208 0000 001d 1500 0808 0300 0000 ................ 0001ac0: be00 4944 3832 3800 0000 0000 0000 0000 ..ID828......... 0001ad0: 0000 1c07 0000 001d 1500 0710 0300 0000 ................ 0001ae0: be00 4944 3832 3900 0000 0000 0000 0000 ..ID829......... 0001af0: 0000 5505 0000 001d 1500 0517 0300 0000 ..U............. 0001b00: 9c10 4249 3131 3100 0000 0000 0000 3200 ..BI111.......2. 0001b10: 0000 8506 0000 0060 0200 0222 0303 2c03 .......`..."..,. 0001b20: fe00 0106 0400 0000 0000 0000 0000 0000 ................ 0001b30: 0000 0000 0000 0000 0000 0000 0000 0000 ................ 0001b40: be00 4249 3131 3100 0000 0000 0000 3100 ..BI111.......1. 0001b50: 0000 9c07 0000 0060 0200 0330 0604 1307 .......`...0.... 0001b60: be00 5045 4332 3000 0000 0000 0000 0000 ..PEC20......... 0001b70: 0000 3804 0000 005f 0800 0313 2301 1739 ..8...._....#..9 0001b80: fe00 0332 0705 0908 0412 0803 3109 0303 ...2........1... 0001b90: 0a02 140a 0000 0000 0000 0000 0000 0000 ................ 0001ba0: be00 4655 5333 3400 0000 0000 0000 3300 ..FUS34.......3. 0001bb0: 0000 2607 0000 0060 0500 061c 0301 0704 ..&....`........ 0001bc0: be00 484f 4734 0000 0000 0000 0000 0000 ..HOG4.......... 0001bd0: 0000 d508 0000 001d 1600 0832 0300 0000 ...........2.... 0001be0: be00 4655 5333 3800 0000 0000 0000 0000 ..FUS38......... 0001bf0: 0000 3705 0000 007f 0600 0424 0301 0a04 ..7........$.... Filenames seem to be 12 characters plus a 3 character extension. Anyone? Anyone? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]