| Image | Item Reference | Title | Description | Date |
 | HC0625 | 1502494 | PC-AT Technical Reference | 1984 | |
| HC0626 | 6139362 | PC-AT Technical Reference Volume 1 | 1985 | |
| HC0627 | 6183355 | PC-AT Technical Reference Volume 2 | 1986 | |
| HC0628 | 15F0306 | PS/2 & Personal Computer BIOS Interface Technical Reference | 1988 | |
| HC0629 | 80X0902 | PS/2 Model 50 / 60 Technical Reference | 1987 | |
| HC0630 | 15F2160 | Microchannel architecture supplement for PS/2 hardware interface Technical Reference | 1989 | |
| HC0631 | 84X1508 | PS/2 Model 80 Technical Reference | 1987 | |
| HC0632 | 6280655 | PC Convertible Technical Reference Volume 1 | 1986 | |
| HC0633 | 55X8817 | PC Convertible Technical Reference Volume 2 | 1986 | |
| HC0634 | 6137804 | Personal Computer Technical Reference, options & adapters Volume 1 | 1984 | |
| HC0635 | 6137806 | Personal Computer Technical Reference, options & adapters Volume 2 | 1984 | |
| HC0636 | 6322522 | Personal Computer Technical Reference, options & adapters Volume 3 | 1984 | |
| HC0637 | 1502264 / 1502293 | PCjr Technical Reference | 1983 | |
| HC0638 | 84F9808 / S84F-9808-00 | PS/2 Hardware Interface Technical Reference – Architectures | 1990 | |
| HC0639 | 84F9807 / S84F9807-00 | PS/2 Hardware Interface Technical Reference – System Specific Information Models 50 55 55SX 60 65SX 70 80 90 95 | 1990 | |
| HC0640 | 84F9809 / S84F-9809-00 | PS/2 Hardware Interface Technical Reference – Common Interfaces | 1990 | |
| HC0641 | 04G3823 / S04F-3283-00 | PS/2 BIOS Interface Technical Reference | 1990 | |
| HC0642 | 84X1514 | PS/2 & Personal Computer BIOS Interface Technical Reference | 1987 | |
| HC0643 | 68X2260 / S68X-2260-00 | PS/2 & Personal Computer BIOS Interface Technical Reference (manual 84X1514) | 1987 | |
| HC0644 | 15F2270 / S15F-2270-00 | PS/2 Model L40SX Technical Reference | 1991 | |
| HC0645 | 1502493 | PC-AT Hardware Maintenance & Service Volume 1 | 1984 | |
| HC0646 | 6361704 | PC-AT Hardware Maintenance & Service Volume 2 | | |
| HC0647 | 95X0130 | 4691 Programmable Cash Terminal Models 3 & 4 Maintenance Information + diagnostic diskette (Moonshine) | 1988 | |
| HC0648 | 6359979 | Portable Personal Computer Hardware Maintenance & Service Volume 1 | 1984 | |
| HC0649 | 6359984 | Portable Personal Computer Hardware Maintenance & Service Volume 2 | 1984 | |
| HC0650 | 6936877 | Personal Computer Hardware Maintenance & Service | 1983 | |
| HC0651 | 6139776 | Personal Computer XT Guide to Operations | 1985 | |
| HC0652 | 1502490 | Personal Computer Guide to Operations | 1984 | |
| HC0653 | 95X3681 / 74X9457 | PC Convertible Guide to Operations | 1986 | |
| HC0654 | 22-6264-1 | 305 RAMAC Manual of Operation – Mint condition | April 1957 | |
| HC0655 | Model | International Time Recording Division – International Program Device Metal Disc Model | 15/09/1936 | |
| HC0656 | A26-3502-2 | 305 RAMAC reference Manual and Reference Card (inside) | 1959 | |