Operating systems › Digital Research CP/M › CP/M 1.4
CP/M 1.4
1976
The 1977 Digital Research release that standardised CP/M across early 8-inch-disk Intel 8080 microcomputers.
Reference & documentation
External technical references for programming CP/M 1.4 and for writing emulators.
| Resource | Type | Notes |
|---|---|---|
| CP/M 1.3/1.4 Disc & Directory Format (seasip) ↗ | Format | Reverse-engineered 1.4 disc, directory and allocation layout |
| CP/M Disk and File System Format (cpm8680) ↗ | Format | Directory entry and allocation-block format reference |
| Intel 8080/8085 Assembly Language Programming Manual ↗ | Instruction set | 8080 CPU instruction set CP/M 1.4 runs on |
| CP/M 1.4 System Alteration Guide (Digital Research) ↗ | Memory map | Official BIOS, memory layout, disk-parameter customization |
| CP/M 1.4 Interface Guide (Digital Research) ↗ | Programming | Official spec for calling BDOS and BIOS |
| CP/M BIOS Entry Points (seasip) ↗ | Programming | BIOS jump table and CP/M 1.x differences |
| The Programmer's CP/M Handbook (Johnson-Laird) ↗ | Programming | Deep BDOS/BIOS internals and system-programming reference |
| CP/M BDOS System Calls (seasip) ↗ | Reference | BDOS function numbers with CP/M 1.4 specifics |
| Altair CP/M 1.4 User Guide (Lifeboat) ↗ | Reference | Altair distribution CP/M 1.4 user manual |
| Early Digital Research CP/M Source Code (CHM) ↗ | Source | Download original CP/M 1.4 BDOS PL/M source |
| cpmtools ↗ | Tool | Command-line utilities to read/write CP/M filesystems |
| jhallen/cpm emulator and cpmtool ↗ | Tool | Handles 256,256-byte 8-inch CP/M 1.4 images |