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Latest revision as of 08:22, 4 December 2010
|Entry point||Function provided||Notes|
|FILLMEM||Fill a block of memory with a value||Destination, value and length passed in registers.|
|FILLZERO||Fill a block of memory with zeros||Destination and length passed in registers. Fills with zero.|
|CLRSCR||Clear the screen.||Fills BACKTAB with zeros.|
See source code below for calling convention.
(todo... please contribute!)
;* ======================================================================== *; ;* These routines are placed into the public domain by their author. All *; ;* copyright rights are hereby relinquished on the routines and data in *; ;* this file. -- Joseph Zbiciak, 2008 *; ;* ======================================================================== *; ;; ======================================================================== ;; ;; FILLZERO ;; ;; Fills memory with zeros ;; ;; ;; ;; FILLMEM ;; ;; Fills memory with a constant ;; ;; ;; ;; INPUTS: ;; ;; R0 -- Fill value (FILLMEM only) ;; ;; R1 -- Number of words to fill ;; ;; R4 -- Start of fill area ;; ;; R5 -- Return address ;; ;; ;; ;; OUTPUTS: ;; ;; R0 -- Zeroed if FILLZERO, otherwise untouched. ;; ;; R1 -- Zeroed ;; ;; R4 -- Points to word after fill area ;; ;; ======================================================================== ;; CLRSCR PROC MVII #$0F0, R1 MVII #$200, R4 FILLZERO CLRR R0 ; Start out with R0 zeroed for FILLZERO FILLMEM MVO@ R0, R4 ; Store R0 out at R4, and move along DECR R1 ; Keep going until our count runs out BNEQ FILLMEM JR R5 ; Return to the caller. ENDP ;; ======================================================================== ;; ;; End of File: fillzero.asm ;; ;; ======================================================================== ;;