Difference between revisions of "Programming:An example boot sector (executed with rsx command CPM)"
From CPCWiki - THE Amstrad CPC encyclopedia!
(Category) |
|||
Line 45: | Line 45: | ||
defb "Hello, this is a boot sector program",0 | defb "Hello, this is a boot sector program",0 | ||
</pre> | </pre> | ||
− | [[Category:Programming]] | + | |
+ | [[Category:Source code]] [[Category:Programming]] |
Latest revision as of 08:09, 7 December 2020
;; An example boot sector. ;; ;; The boot sector is located on track 0, side 0,sector &41, and ;; is executed with a |CPM command. A maximum of 512 bytes will be loaded to &100 ;; in RAM. This sector *must* exist for the disc to be started with the |CPM command. ;; ;; If the disc is formatted to SYSTEM or VENDOR format, then the directory ;; will start on track 2, side 0, sector &41. Otherwise, the disc may use ;; a custom format for the remainder of track 0 and subsequent tracks. ;; ;; If a directory doesn't exist, then you must use sector read/write functions to load ;; data. ;; ;; The boot sector is loaded to &100 in memory and executed. org &100 .km_wait_char equ &bb06 .txt_output equ &bb5a ;;------------------------------------------------------ ;; display a message ld hl,message call display_message ;; wait for a keypress call km_wait_char ;; soft-reset CPC rst 0 ;;------------------------------------------------------ .display_message ld a,(hl) inc hl or a ret z call txt_output jp display_message ;;------------------------------------------------------ .message defb "Hello, this is a boot sector program",0