personal computer hardware reference library USA International business machines 1981 revised edition (1-22) p section 1 hardware overview(page 1-1)section 2 hardware (page 2-1)section 3 rom and system usage (page 3-1)section 4 appendices(page a-0) Almirah No.40 Shelf No.6 Technical reference 621.391 20170207170053.0