Change all numbers to hex and add trailing space removing to read.

src/boot.asm

@@ -8,16 +8,16 @@ mov ax, 0x1000
 mov es, ax
 mov bx, 0
 
-mov al, 32
+mov al, 0x20
 mov dh, 0
 mov ch, 0
-mov cl, 2
+mov cl, 0x2
 
-mov ah, 2
+mov ah, 0x2
 int 0x13
 
 jmp 0x1000:0
 
-times 510-($-$$) db 0
+times 0x1fe-($-$$) db 0
 db 0x55
 db 0xaa

src/os.asm

@@ -7,6 +7,10 @@ call print
 loop:
 mov si, prompt
 call print
+mov cx, 0x4d
+mov di, input
+mov al, 0
+rep stosb
 mov di, input
 call read
 cmp byte [input], 0
@@ -15,10 +19,6 @@ mov si, input
 call print
 mov si, newline
 call print
-mov cx, 0x4e
-mov di, input
-mov al, 0
-rep stosb
 jmp loop
 
 print:
@@ -38,7 +38,7 @@ mov ah, 0
 int 0x16
 cmp al, 0xd
 je .return
-cmp al, 8
+cmp al, 0x8
 je .backspace
 cmp cl, 0x4d
 je .loop
@@ -76,6 +76,20 @@ dec di
 dec cl
 jmp .loop
 .return:
+mov di, input.end
+.tspfind:
+dec di
+cmp byte [di], 0
+je .tspfind
+cmp byte [di], 0x20
+je .tsperase
+jmp .done
+.tsperase:
+mov al, 0
+stosb
+dec di
+jmp .tspfind
+.done:
 mov si, newline
 call print
 ret
@@ -83,11 +97,13 @@ ret
 welcome:
 db 0xd, 0xa, "Welcome to EttinOS!", 0xd, 0xa, 0xd, 0xa, 0
 
-input:
-times 78 db 0
-
 prompt:
 db "> ", 0
 
 newline:
 db 0xd, 0xa, 0
+
+input:
+times 0x4d db 0
+.end:
+db 0