CP/M was an early operating system for 8-bit computers. See wikipedia's CP/M Entry for more information.
Since initial versions of the H8 and H89 computers had the lower 8k of memory space reserved for system ROM and RAM, a modification was required for the older systems called "ORG-0". This modification allowed the computer to remap the lower 8k to be user RAM by setting a special bit in an I/O port. Newer H89's had this functionality built-in.
From the Spring/Summer 1982 Heath catalog:
Industry standard CP/M Operating System
- Over 200,000 microcomputer owners use CP/M
- Provides common hardware interface with flexibility
Features: CP/M, Version 2.2.03, frees the user from having to understand the details of underlying hardware. It has fully dynamic named-file allocation, program and peripheral output control and random or sequential data access. Has two-pass assembler, general-purpose editor, advanced 8080 debugger, file dump and copy between devices, system generation/relocation and file size/disk usage displays. CP/M requires an H-8/H-19 or H/Z-89 computer system with a minimum of 48K bytes of RAM and one disk drive (two disk drives are highly recommended). H-8 systems also require HA-8-8 Extended Configuration Option or HA-8-6 Z-80 CPU Card.
HOS-8917-2, hard-sectored 5.25" disk, 5 lbs. ...... $150.00
HOS-8937-2, soft-sectored 5.25" disk, 5 lbs. ....... $150.00
HOS-8947-2, 8" disk for H-47, 5 lbs. ................... $150.00
HOS-8967-2, 8" disk for Z-67, 5 lbs. .................... $150.00
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