Dir cleanup

2025-10-01 23:44:19 +02:00
parent bf9a88805f
commit 1b2237f2f7
39 changed files with 84 additions and 74 deletions
--- a/src/dosdbt.asm
+++ b/src/dosdbt.asm
@@ -0,0 +1,25 @@
+BITS 16
+CPU 8086
+
+diskpointer equ 0x1e*4
+dbtbase equ 0x100
+
+_start:
+    jmp main
+
+main:
+    push ds
+    mov si, diskpointer
+    lds si, [si]
+    mov di, dbtbase
+    mov cx, 0x0a
+    cld
+    rep movsb
+    pop ds
+    mov al, 9  ; sectors per track
+    mov di, dbtbase
+    mov [di+4], al
+    mov di, diskpointer
+    mov [di], word dbtbase
+    mov [di+2], ds
+    retf