Finish writing fileify, remove printch and readch since those have not proven useful, merge the code in byte2hex to keycode, and rename printnl back to newline because it was easy to confuse with println.

src/BYTE2HEX.INC

@@ -1,49 +0,0 @@
-;Converts a byte in AL to a hex string at DI.
-
-byte2hex:
-
-;Store the initial registers in the stack
-push si
-push ax
-push bx
-push cx
-
-;Move the byte to AH
-mov ah, al
-
-;Set a key for the hex digits
-mov si, .key
-
-;Set a counter for the two hex digits
-mov cx, 0x2
-
-.loop:
-
-;Read a nibble
-rol ax, 0x1
-rol ax, 0x1
-rol ax, 0x1
-rol ax, 0x1
-mov bx, ax
-
-;Convert the nibble to a hex digit
-and bx, 0xf
-mov bl, [si + bx]
-
-;Store the hex digit
-mov [di], bl
-
-;Repeat
-inc di
-dec cx
-jnz .loop
-
-;Load the initial registers from the stack
-pop cx
-pop bx
-pop ax
-pop si
-
-ret
-
-.key db "0123456789abcdef"

src/FILEIFY.INC

@@ -1,7 +1,5 @@
 ;Reads a string, checks if it is a valid 8.3 file name, converts it into FAT formatting, and prints it.
 
-;To do: change the .test call to work with flags instead of direct jumps.
-
 fileify:
 
 ;Read a string
@@ -23,39 +21,42 @@ sub di, 0xb
 mov bl, 0x8
 
 .nameloop:
-
 ;Load a character
 lodsb
-
 ;Check for a period
 cmp al, 0x2e
 je .initext
-
-call .test
+;Check for everything else and convert to upper case
+call .checkconv
 jmp .nameloop
 
 .initext:
-;Set DI and initialise the counter for the extension
+;Set DI and initialise the length counter for the extension
 mov bl, 0x3
 mov di, .file+0x8
 
 .extloop:
-call .test
+;Load a character
+lodsb
+;Check for a period
+push ax
+cmp al, 0x2e
+je .error
+pop ax
+;Check for everything else and convert to upper case
+call .checkconv
 jmp .extloop
 
 .error:
+pop ax
 mov si, .errormsg
 call println
 jmp .done
 
 .print:
-mov si, .name
-call printstr
-mov si, .extension
-call printstr
-mov al, 0x7c
-call printch
-call printnl
+pop ax
+mov si, .file
+call println
 
 .done:
 ret
@@ -64,7 +65,7 @@ ret
 
 .errormsg db "Invalid file name", 0x0
 
-.test:
+.checkconv:
 
 ;Check for the string end
 cmp al, 0x0
@@ -103,13 +104,13 @@ je .error
 ;Find and convert lower case letters to upper case
 ;Check for lower case
 cmp al, 0x61
-jl .conttest
+jl .storech
 cmp al, 0x7a
-jg .conttest
+jg .storech
 ;Convert lower to upper case
 sub al, 0x20
 
-.conttest:
+.storech:
 
 ;Store the character
 stosb

src/KEYCODE.INC

@@ -17,13 +17,13 @@ call printstr
 ;Convert the scancode to a hex string
 mov al, [.scan]
 mov di, .keycode
-call byte2hex
+call .byte2hex
 
 ;Convert the ascii value to a hex string
 mov al, [.ascii]
 mov di, .keycode
 add di, 0x2
-call byte2hex
+call .byte2hex
 
 ;Print the keycode
 mov si, .keycode
@@ -37,3 +37,51 @@ ret
 .ascii db 0x0
 
 .keycode times 0x5 db 0x0
+
+.byte2hex:
+
+;Store the initial registers in the stack
+push si
+push ax
+push bx
+push cx
+
+;Move the byte to AH
+mov ah, al
+
+;Set a key for the hex digits
+mov si, .key
+
+;Set a counter for the two hex digits
+mov cx, 0x2
+
+.loop:
+
+;Read a nibble
+rol ax, 0x1
+rol ax, 0x1
+rol ax, 0x1
+rol ax, 0x1
+mov bx, ax
+
+;Convert the nibble to a hex digit
+and bx, 0xf
+mov bl, [si + bx]
+
+;Store the hex digit
+mov [di], bl
+
+;Repeat
+inc di
+dec cx
+jnz .loop
+
+;Load the initial registers from the stack
+pop cx
+pop bx
+pop ax
+pop si
+
+ret
+
+.key db "0123456789abcdef"

src/NEWLINE.INC

@@ -1,12 +1,12 @@
 ;Prints a newline
 
-printnl:
+newline:
 
 ;Store the initial registers in the stack
 push si
 
 ;Print the newline
-mov si, .nl
+mov si, .newline
 call printstr
 
 ;Load the initial registers from the stack
@@ -14,4 +14,4 @@ pop si
 
 ret
 
-.nl db 0xd, 0xa, 0x0
+.newline db 0xd, 0xa, 0x0

src/PRINTCH.INC

@@ -1,8 +0,0 @@
-;Prints a character from AL
-
-printch:
-
-mov ah, 0xe
-int 0x10
-
-ret

src/PRINTLN.INC

@@ -6,6 +6,6 @@ println:
 call printstr
 
 ;Print a newline
-call printnl
+call newline
 
 ret

src/READCH.INC

@@ -1,28 +0,0 @@
-;Reads a character to AL
-
-readch:
-
-;Store the initial registers
-push bx
-push ax
-
-;Read a keypress
-mov ah, 0x0
-int 0x16
-
-;Check for non-printing characters
-cmp al, 0x1f
-jle readch
-cmp al, 0x7f
-je readch
-
-;Print the character
-mov ah, 0xe
-int 0x10
-
-;Load the initial registers
-pop bx
-mov ah, bh
-pop bx
-
-ret

src/READLN.INC

@@ -6,6 +6,6 @@ readln:
 call readstr
 
 ;Print a newline
-call printnl
+call newline
 
 ret

src/SYSTEM.ASM

@@ -4,19 +4,16 @@ ORG 0x500
 jmp start
 
 ;Calls
-%include "BYTE2HEX.INC"
 %include "CMPSTR.INC"
-%include "PRINTNL.INC"
-%include "PRINTCH.INC"
 %include "PRINTSTR.INC"
-%include "PRINTLN.INC"
-%include "READCH.INC"
 %include "READSTR.INC"
+%include "NEWLINE.INC"
+%include "PRINTLN.INC"
 %include "READLN.INC"
 
 ;Commands
 %include "ECHO.INC"
-;%include "FILEIFY.INC"
+%include "FILEIFY.INC"
 %include "HELLO.INC"
 %include "HELP.INC"
 %include "KEYCODE.INC"
@@ -59,20 +56,20 @@ je loop
 mov si, buffer
 mov di, cmd.echo
 call cmpstr
-;jnc .fileify
-jnc .hello
+jnc .fileify
+;jnc .hello
 ;Execute
 call echo
 jmp loop
-;.fileify:
-;;Check
-;mov si, buffer
-;mov di, cmd.fileify
-;call cmpstr
-;jnc .hello
-;;Execute
-;call fileify
-;jmp loop
+.fileify:
+;Check
+mov si, buffer
+mov di, cmd.fileify
+call cmpstr
+jnc .hello
+;Execute
+call fileify
+jmp loop
 .hello:
 ;Check
 mov si, buffer