Changes
[[Image:cpm30boot.jpg|thumb|300px|CP/M 3.0 after boot]]
== Amstrad's CP/M+ ==
* Amstrad CP/M+ uses Amstrad's "System" format. This is 40 tracks, 1 side, 9 sectors per track numbered &41-&49. There are two reserved tracks, then the directory which has 64 entries, and then the data area.
* CP/M is booted using an RSX command "|CPM" which is implemented in the Amstrad disc rom (AMSDOS).
* |CPM loads track 0, side 0, sector &41 into RAM at &100-&2ff. This is the boot sector and contains the boot program.
* The boot program then loads the directory from track 2, sector &41.
* The boot program locates a program with extension "EMS".
* This program is loaded into RAM at &c00.
* This is then executed. (EMS contains the BIOS, BDOS and relocates and re-configures the memory. CP/M doesn't use the CP/M 2.2 BIOS from the Amstrad disc ROM.)
[[Category:CP/M]][[Category:Operating System]]
