shell: echo types letters right away

Easier to use this way...

parts/acia.asm

@@ -85,7 +85,7 @@ aciaInt:
 	call	aciaIncIndex
 	ld	(ACIA_BUFWRIDX), a
 
-	; And finially, fetch the value and write it.
+	; And finally, fetch the value and write it.
 	in	a, (ACIA_IO)
 	ld	(de), a
 

parts/shell.asm

@@ -1,6 +1,6 @@
 ; shell
 ;
-; Runs a shell over an block device interface.
+; Runs a shell over a block device interface.
 
 ; Status: incomplete. As it is now, it spits a welcome prompt, wait for input
 ; and compare the first 4 chars of the input with a command table and call the
@@ -70,6 +70,9 @@ shellLoop:
 	cp	ASCII_LF
 	jr	z, .do		; char is LF? do!
 
+	; Echo the received character right away so that we see what we type
+	SHELL_PUTC
+
 	; Ok, gotta add it do the buffer
 	; save char for later
 	ex	af, af'