1 files changed, 0 insertions, 61 deletions
diff --git a/boot/check_a20_16.asm b/boot/check_a20_16.asm
deleted file mode 100644
index 43da6e3..0000000
--- a/boot/check_a20_16.asm
+++ /dev/null
@@ -1,61 +0,0 @@
-; The following code is public domain licensed
- 
-[bits 16]
- 
-; Function: check_a20
-;
-; Purpose: to check the status of the a20 line in a completely self-contained state-preserving way.
-;          The function can be modified as necessary by removing push's at the beginning and their
-;          respective pop's at the end if complete self-containment is not required.
-;
-; Returns: 0 in ax if the a20 line is disabled (memory wraps around)
-;          1 in ax if the a20 line is enabled (memory does not wrap around)
- 
-check_a20:
-    pushf
-    push ds
-    push es
-    push di
-    push si
- 
-    cli
- 
-    xor ax, ax ; ax = 0
-    mov es, ax
- 
-    not ax ; ax = 0xFFFF
-    mov ds, ax
- 
-    mov di, 0x0500
-    mov si, 0x0510
- 
-    mov al, byte [es:di]
-    push ax
- 
-    mov al, byte [ds:si]
-    push ax
- 
-    mov byte [es:di], 0x00
-    mov byte [ds:si], 0xFF
- 
-    cmp byte [es:di], 0xFF
- 
-    pop ax
-    mov byte [ds:si], al
- 
-    pop ax
-    mov byte [es:di], al
- 
-    mov ax, 0
-    je check_a20__exit
- 
-    mov ax, 1
- 
-check_a20__exit:
-    pop si
-    pop di
-    pop es
-    pop ds
-    popf
- 
-    ret