Moved "bios" to "os"

assembly/os/libs/strings.asm

@@ -0,0 +1,23 @@
+; Strings manipulation library
+; @author Daniele Verducci
+
+; Transforms case to upper
+
+Strings_strToUpper:
+    ; TODO
+    ret
+
+Strings_strToLower:
+    ; TODO
+    ret
+
+; Transforms character in A to uppercase. If is not a character, returns as is
+; @param A character to transform
+; @return A upper char
+Strings_charToUpper:
+    ; TODO
+    ret
+
+Strings_charToLower:
+    ; TODO
+    ret

assembly/os/libs/time.asm

@@ -0,0 +1,20 @@
+; Time library
+; @author Daniele Verducci
+
+; Duration in cpu cycles / 55 (change these values based on CPU frequency)
+TIME_DUR_SECOND: EQU 2545
+TIME_DUR_MILLIS: EQU 3
+
+; Wait bc * 55 states
+; Use 1 iteration as delay between I/O bus writes
+; @param bc The number of iterations. Each iteration is 55 states long.
+Time_delay55:
+    bit     0,a    ; 8
+    bit     0,a    ; 8
+    bit     0,a    ; 8
+    and     255  ; 7
+    dec     bc      ; 6
+    ld      a,c     ; 4
+    or      b     ; 4
+    jp      nz,Time_delay55   ; 10, total = 55 states/iteration
+    ret