ROM Backups

ROM Backups

There were two EPROMs in the entire system, a bootstrap ROM and character generator ROM. I have backed both up here for archival sake.

Bootstrap ROM

The bootstrap ROM contains the basic code to get the machine up and running. It also contains some code for printing to the CRT in case of a memory error. There should also be some disk initialization stuff in there somewhere too. Other than that, we haven't done much disassembly of the ROM just yet.

Click here to download the binary file.

C3 C8 C2 C3 83 C0 31 00 C0 CD 4C C0 DA 00 C0 06 80 0E 00 16 10 1E 20 2E 00 26 00 3E 01 CD 03 C0 DA 3D C0 06 00 ED 5B 00 11 53 1E 20 CD 03 C0 DA 3D C0 21 01 01 1E 00 19 5E 23 56 EB E9 DB 0A CB 97 D3 0A 01 00 00 CD 2C C2 C3 00 C0 F3 3E FF D3 33 3E FF D3 33 3E 07 D3 33 3E FF D3 31 DB 0A CB EF D3 0A 01 7B 02 CD 2C C2 DB 0A CB AF D3 0A 01 AC 00 CD 2C C2 21 00 BF 36 00 06 03 21 13 C2 CD 20 C2 C9 F3 DD E5 FD E5 D5 C5 E5 FD 21 00 BF DD 21 08 BF FD 72 03 FD 71 02 FD 73 04 FD 75 01 FD 70 05 FD 77 06 7C 07 07 FD 77 07 FD CB 06 46 DB 0A 20 08 CB 5F 20 12 CB DF 18 06 CB 57 20 0A CB D7 D3 0A 01 00 81 CD 2C C2 CD 54 C2 DA 10 C2 FD CB 06 46 20 0C FD CB 00 46 20 10 FD CB 00 C6 18 11 FD CB 00 4E FD CB 00 CE 28 07 FD CB 05 7E CA 42 C1 DD 36 00 07 FD 7E 06 DD 77 01 06 02 21 08 BF CD 20 C2 DA 10 C2 CD AE C2 06 01 21 16 C2 CD 20 C2 DA 10 C2 06 02 CD 80 C2 DA 10 C2 DD 7E 00 E6 03 FD BE 06 C2 07 C1 3E C0 DD A6 00 C2 10 C2 DD 7E 01 B7 C2 10 C2 FD CB 00 56 FD CB 00 96 C2 10 C2 DD 36 00 0F FD 6E 01 DD 75 02 FD 7E 07 FD B6 06 DD 77 01 06 03 21 08 BF CD 20 C2 DA 10 C2 CD AE C2 06 01 21 16 C2 CD 20 C2 DA 10 C2 06 02 CD 80 C2 DA 10 C2 DD 7E 00 E6 03 FD BE 06 C2 60 C1 3E C0 DD A6 00 C2 10 C2 FD 7E 01 DD BE 01 C2 10 C2 FD CB 00 56 FD CB 00 96 C2 10 C2 01 09 00 11 08 BF 21 17 C2 ED B0 FD 7E 07 0F 0F DD 77 03 FD 7E 07 FD B6 06 DD 77 01 FD 6E 01 FD 66 02 24 DD 75 02 DD 74 04 06 09 21 08 BF CD 20 C2 DA 10 C2 FD 46 04 FD 66 03 2E 00 0E 0B C5 06 00 DB 31 87 38 10 F2 DE C1 ED A2 C2 DE C1 C1 10 ED CD A3 C2 18 01 C1 06 07 CD 80 C2 DA 10 C2 3E C0 DD A6 00 C2 10 C2 AF FD 7E 06 E1 C1 D1 FD E1 DD E1 C9 37 18 F2 03 BF 10 08 E6 00 00 00 00 01 10 14 FF CD 37 C2 D8 7E D3 0B 23 10 F6 BF C9 E5 2A 00 00 E1 0B 78 B1 20 F6 C9 D5 11 00 00 DB 0C CB 7F C2 4C C2 1B 7A B3 C2 3B C2 D1 C3 A1 C2 D1 CB 77 C2 A1 C2 BF C9 DD 36 00 4A FD 7E 07 FD B6 06 DD 77 01 06 02 21 08 BF CD 20 C2 D8 CD AE C2 06 07 CD 80 C2 D8 FD CB 00 56 FD CB 00 96 C2 A1 C2 AF C9 21 08 BF 0E 0B 11 00 00 DB 0C CB 7F 20 08 1B 7A B3 20 F5 C3 A1 C2 CB 77 CA A1 C2 ED A2 20 E9 BF C9 37 C9 DB 0A CB E7 D3 0A CB A7 D3 0A C9 01 00 00 DB 31 CB 7F C0 0B 78 B1 F5 F5 F1 F1 C2 B1 C2 CD A3 C2 FD CB 00 D6 C9 F3 ED 5E 3E 86 D3 5F ED 57 20 FE AF D3 5F 31 00 C0 AF D3 06 3E 03 D3 20 D3 21 D3 22 D3 23 3E 07 D3 32 D3 33 D3 52 D3 53 21 C4 C6 7D D3 32 7C ED 47 3E 4F D3 32 3E 87 D3 32 DB 30 AF D3 33 3E FF D3 33 3E C1 D3 33 D3 4E D3 4A D3 4E 3E 63 D3 40 3E 26 D3 41 3E 55 D3 42 3E D7 D3 43 3E 14 D3 44 3E 1F D3 45 3E 17 D3 46 AF D3 31 5F FB 26 02 0E 00 06 C8 10 FE 10 FE 10 FE 10 FE 10 FE 0D 20 F1 25 C2 39 C3 FE 12 C2 76 C3 AF FB 26 02 0E 00 06 C8 10 FE 10 FE 10 FE 10 FE 10 FE 0D 20 F1 25 20 EE 31 00 C0 FE 7E CA E5 C5 FE 7D CA 06 C0 F3 31 00 C0 AF D3 32 ED 47 3E 4F D3 32 3E 87 D3 32 DB 30 3E 8D D3 5F 06 08 21 00 C0 3E FF 07 30 02 EE 08 AE 2C 20 F7 24 10 F4 A7 20 FE 3E C0 D3 5F DB 0A CB EF D3 0A 06 00 10 02 06 30 10 FE DB 0A CB AF D3 0A DB 31 CB 7F 28 FA DB 0C FE 80 20 FE 3E A0 D3 5F 16 4C 1E 49 06 00 4A 78 ED 79 4B ED 78 B8 20 FE 04 20 F3 3E AF D3 5F DB 07 E6 03 57 47 1E 7F D3 05 21 FF BF 3E AA 77 2B 7C BB 20 F8 7B FE FF 28 0A 05 78 FE 00 20 E8 1E FF 18 E4 AF 47 10 FE 3C 20 FA 1E 7F 42 78 D3 05 21 FF BF 3E AA 4E B9 20 1C CB 06 4E 3E 55 B9 20 14 2B 7C BB 20 ED 7B FE FF 28 24 05 78 FE 00 20 DD 1E FF 18 D9 5F 78 BA 28 FB 7A D3 05 7B C5 F5 E5 11 00 80 21 C6 C6 01 B5 00 ED B0 C3 00 80 3E 92 D3 5F 11 00 00 21 64 C4 01 50 00 ED B0 C3 00 00 3E 80 D3 03 21 00 C0 3E FF 77 23 7D FE 50 20 F7 2E 00 24 7C FE D8 38 EF FE E0 30 02 26 E0 FE F8 38 E5 21 00 C0 3E FF 4E B9 20 FE 34 4E AF B9 20 FE 23 7D FE 50 20 EE 2E 00 24 7C FE D8 38 E6 FE E0 30 02 26 E0 FE F8 38 DC AF D3 03 C3 B3 C4 3E AE D3 5F CD CD C5 CD CD C5 21 A8 C5 22 00 00 06 00 ED 5E FB D3 31 3E 02 D3 31 3E FF 3D 20 FD AF D3 31 AF B8 28 FC F3 3E 02 D3 31 3E D0 D3 5F 3E FF D3 53 D3 53 3E 07 D3 53 DB 51 CB 7F 20 FE 3E 20 D3 5C DB 51 CB 7F 28 FE AF D3 5C 3E 8C D3 5F AF D3 06 3E 03 D3 20 D3 21 D3 22 D3 23 3E 07 D3 32 D3 33 D3 52 D3 53 ED 5E 21 A8 C5 22 00 00 22 02 00 22 04 00 22 06 00 AF ED 47 47 3E 00 D3 20 3E 97 D3 23 D3 22 D3 21 D3 20 3E 9C D3 23 D3 22 D3 21 D3 20 FB 1E 38 16 FF 15 20 FD 1D 20 FA 3E 03 F3 D3 20 D3 21 D3 22 D3 23 78 FE 44 20 FE 3E 88 D3 5F CD 4C C0 06 80 0E 00 16 00 1E 01 26 00 2E 06 3E 01 CD 03 C0 30 08 2E 06 CD 71 C6 C3 63 C5 2E 00 3E 01 AC 67 3E 01 CD 03 C0 38 F5 AF B5 20 01 37 CB 15 CB 75 28 EA 3E D8 D3 5F 3E FF ED 47 C3 06 C0 FB 00 00 00 00 04 ED 4D DB 30 57 31 C7 C5 7B FE FF 7A CA C2 C5 1E FF 31 C5 C5 00 ED 4D 4C C3 69 C3 DB 30 ED 4D 0E 0A 06 00 10 FE 06 30 10 FE 0D 20 F7 C9 06 00 10 FE 06 30 10 FE 00 C9 DB 0A CB D7 D3 0A 3E F0 D3 5F CD 4C C0 F3 AF D3 32 ED 47 3E 4F D3 32 3E 87 D3 32 DB 30 AF D3 33 3E FF D3 33 3E C1 D3 33 AF D3 31 21 C9 C5 22 00 00 ED 5E FB AF FE 00 28 FC 2E 00 FE 65 28 27 2E 01 FE 6E 28 21 2E 02 FE 6D 28 1B 2E 03 FE 6C 28 15 2E 10 FE 6B 28 0F 2E 20 FE 6A 28 09 2E 27 FE 69 28 03 C3 18 C6 CD 54 C6 CD 71 C6 C3 18 C6 3E 07 CD 94 C6 D3 0B 3E 01 CD 94 C6 D3 0B DB 31 CB 7F 20 05 CD CD C5 18 F5 CD B2 C6 C9 3E 0F CD 94 C6 D3 0B 3E 01 CD 94 C6 D3 0B 7D CD 94 C6 D3 0B DB 31 CB 7F 20 05 CD CD C5 18 F5 CD B2 C6 C9 F5 C5 DB 0C CB 7F 28 FA CB 77 20 FC C1 F1 C9 F5 C5 DB 0C CB 7F 28 FA CB 77 28 FC C1 F1 C9 3E 08 CD 94 C6 D3 0B CD A3 C6 DB 0B CD A3 C6 DB 0B C9 B0 C5 3E 80 D3 03 21 00 C0 AF 77 23 BC 20 FB 21 68 80 11 00 F2 7E FE 03 28 0F FE 0D 20 06 23 14 1E 00 18 F1 12 23 13 18 EC D1 7A 21 10 F2 CD 54 80 7B CD 54 80 F1 F5 21 10 F3 CD 54 80 F1 C1 A9 21 10 F5 CD 54 80 79 21 10 F4 CD 54 80 78 21 1C F2 CD 54 80 18 FE F5 0F 0F 0F 0F CD 5D 80 F1 E6 0F C6 90 27 CE 40 27 77 23 C9 4D 65 6D 6F 72 79 20 45 72 72 6F 72 20 61 74 20 20 20 20 20 20 70 61 67 65 0D 45 78 70 65 63 74 65 64 20 64 61 74 61 20 3D 0D 52 65 63 65 69 76 65 64 20 64 61 74 61 20 3D 0D 58 4F 52 20 64 61 74 61 20 3D 03 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 51 34 CC

Character Generator ROM

The character generator ROM is used by the video circuit to draw the ASCII and unique word processing characters on the CRT. There is some funky stuff going on with alignment that we haven't quite figured out yet, but we do believe this is a good dump of the ROM contents.

Click here to download the binary file.

00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 00 00 00 00 00 00 10 00 10 10 10 10 00 00 10 00 44 44 44 00 00 00 00 00 44 44 AA 44 AA 44 44 00 10 54 90 54 12 54 10 00 A2 A4 08 10 20 4A 8A 00 30 48 30 50 8A 84 52 00 10 10 10 00 00 00 00 00 08 10 20 20 20 10 08 00 20 10 08 08 08 10 20 00 44 28 D6 28 44 00 00 00 00 10 10 D6 10 10 00 00 00 00 00 00 28 28 08 10 00 00 00 AA 00 00 00 00 00 00 00 00 00 28 28 00 02 04 08 10 20 40 80 00 28 44 82 82 82 44 28 00 10 50 10 10 10 10 54 00 54 82 02 04 10 40 AA 00 AA 04 08 14 02 82 54 00 08 10 24 44 AA 04 04 00 AA 80 D4 02 02 82 54 00 08 10 20 54 82 82 54 00 AA 02 04 08 10 20 40 00 54 82 82 54 82 82 54 00 54 82 82 54 08 10 20 00 00 28 28 00 28 28 00 00 00 28 28 00 28 28 08 10 02 08 20 80 20 08 02 00 00 00 AA 00 AA 00 00 00 80 20 08 02 08 20 80 00 54 82 02 0C 10 00 10 00 28 42 8A 92 94 40 2A 00 10 28 44 82 AA 82 82 00 54 42 42 54 42 42 54 00 54 82 80 80 80 82 54 00 A8 84 82 82 82 84 A8 00 AA 80 80 A8 80 80 AA 00 AA 80 80 A8 80 80 80 00 54 82 80 80 8A 82 54 00 82 82 82 AA 82 82 82 00 54 10 10 10 10 10 54 00 2A 08 08 08 08 88 50 00 82 84 88 B0 88 84 82 00 80 80 80 80 80 80 AA 00 82 C6 AA 92 82 82 82 00 82 C2 A2 92 8A 86 82 00 54 82 82 82 82 82 54 00 D4 82 82 D4 80 80 80 00 54 82 82 82 8A 84 5A 00 D4 82 82 D4 88 84 82 00 54 82 80 54 02 82 54 00 AA 10 10 10 10 10 10 00 82 82 82 82 82 82 54 00 82 82 82 82 44 28 10 00 82 82 82 92 AA C6 82 00 82 44 28 10 28 44 82 00 82 44 28 10 10 10 10 00 AA 04 08 10 20 40 AA 00 28 20 20 20 20 20 28 00 80 40 20 10 08 04 02 00 28 08 08 08 08 08 28 00 10 28 54 92 10 10 10 00 00 00 00 00 00 00 00 AA 20 10 08 04 00 00 00 00 00 00 28 04 54 84 56 00 40 40 54 42 42 42 54 00 00 00 2A 40 40 40 2A 00 02 02 2A 42 42 42 2A 00 00 00 54 82 AA 80 54 00 0A 10 10 54 10 10 10 00 00 00 2A 42 42 2A 02 14 40 40 54 42 42 42 42 00 10 00 10 50 10 10 54 00 04 00 04 14 04 04 44 28 40 40 42 44 58 44 42 00 50 10 10 10 10 10 54 00 00 00 A4 92 92 92 92 00 00 00 94 42 42 42 42 00 00 00 54 82 82 82 54 00 00 00 54 42 42 54 40 40 00 00 2A 42 42 2A 02 02 00 00 54 22 20 20 20 00 00 00 54 80 54 02 54 00 10 10 54 10 10 12 0C 00 00 00 42 42 42 42 2A 00 00 00 82 82 44 28 10 00 00 00 82 92 92 AA 44 00 00 00 44 28 10 28 44 00 00 00 82 44 28 10 20 40 00 00 54 08 10 20 54 00 10 20 20 40 20 20 10 00 10 10 10 10 10 10 10 00 10 08 08 04 08 08 10 00 00 00 60 92 0C 00 00 00 00 04 54 90 A0 54 80 00