progress on FAT16 support

2024-01-12 13:29:20 +01:00
parent ee2f22df09
commit 507eb3a017
40 changed files with 19699 additions and 6346 deletions
--- a/OperatingSystem/monitor_v2/include/.old/parity.s
+++ b/OperatingSystem/monitor_v2/include/.old/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