Updated

2022-12-16 20:45:34 +01:00
parent aabf475b67
commit bc1b9a399d
40 changed files with 13208 additions and 5377 deletions
--- a/OperatingSystem/monitor_v2/include/parity.s
+++ b/OperatingSystem/monitor_v2/include/parity.s
@@ -0,0 +1,16 @@
+; a contains data
+; bc destroied
+; carry is set if odd, reset if even
+calc_parity:
+    ld c,0  ;parity data
+    ld b,8  ;bit counter
+calc_parity_loop:
+    rrca
+    jr nc,calc_parity_loop_2    ;if not zero then skip increment
+    inc c
+calc_parity_loop_2:
+    djnz calc_parity_loop
+    ld a,c
+    rra     ;carry is set to bit 0 of high-counter. 
+            ;if bit1 is set -> odd # of 1s else even # of 1s
+    ret