Initial data commit

Task/Repeat/Z80-Assembly/repeat-1.z80

@@ -0,0 +1,26 @@
+ld b,&05  ;load the decrement value into b
+ld hl,myFunc ;load the address of "myFunc" into HL
+
+call repeatProcedure
+
+forever:
+jp forever ;trap the program counter here
+
+repeatProcedure: ;input: b = times to repeat, hl = which procedure to repeat
+call trampoline
+; the "ret" in myFunc will bring you here
+djnz repeatProcedure
+ret ;exit "repeatProcedure" and proceed to "forever"
+
+trampoline:
+push hl
+ret
+;this is effectively a call to whatever is in HL, in this case "myFunc." The "ret" at the end of myFunc will return us to
+;just after the line "call trampoline"
+
+
+myFunc: ;this doesn't do anything useful but that's not the point
+push hl ;not needed for this routine but if it altered HL we would need this so that we come back here next time we loop
+or a
+pop hl
+ret

Task/Repeat/Z80-Assembly/repeat-2.z80

@@ -0,0 +1,2 @@
+trampoline:
+jp (hl) ;despite the parentheses this does NOT dereference HL, it merely acts as "LD PC,HL".

Task/Repeat/Z80-Assembly/repeat-3.z80

@@ -0,0 +1,10 @@
+LD HL,myFunc
+LD (repeatproc+1),HL
+LD B,5 ;repeat count
+CALL repeatProc
+
+;somewhere far away from here:
+repeatProc:
+call &0000 ;gets overwritten with the address of MyFunc
+djnz repeatProc
+ret