recipes/sms: plug shell in!

Now this is getting eminently exciting!

recipes/sms/glue.asm

@@ -8,58 +8,79 @@
 .fill 0x66-$
 	retn
 
+#include "err.h"
+#include "core.asm"
+#include "parse.asm"
+
 .equ	PAD_RAMSTART	RAMSTART
 #include "sms/pad.asm"
 
 .equ	VDP_RAMSTART	PAD_RAMEND
 #include "sms/vdp.asm"
 
+.equ	STDIO_RAMSTART	VDP_RAMEND
+#include "stdio.asm"
+
+.equ	SHELL_RAMSTART	STDIO_RAMEND
+.equ	SHELL_EXTRA_CMD_COUNT 0
+#include "shell.asm"
+
 init:
 	di
 	im	1
 
 	ld	sp, RAMEND
 
+	call	padInit
 	call	vdpInit
 
+	ld	hl, myGetC
+	ld	de, vdpPutC
+	call	stdioInit
+	call	shellInit
+	jp	shellLoop
 
-mainloop:
+myGetC:
 	; What we do here is simple. We go though all bits of port A controller
 	; increasing B each time. As soon as we get a hit, we display that
 	; letter. Pressed buttons go low.
 	call	padStatusA
-	jr	z, mainloop	; unchanged since last poll
+	push	bc
+	jr	z, .nothing	; unchanged since last poll
 	ld	b, 'A'
 	bit	5, a		; Port A Button C pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; b
 	bit	4, a		; Port A Button B pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; c
 	bit	3, a		; Port A Right pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; d
 	bit	2, a		; Port A Left pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; e
 	bit	1, a		; Port A Down pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; f
 	bit	0, a		; Port A Up pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; g
 	bit	6, a		; Port A Button A pressed
-	jr	z, updateLetter
+	jr	z, .something
 	inc	b		; h
 	bit	7, a		; Port A Start pressed
-	jr	z, updateLetter	; when start is pressed, print all letters
-	jr	mainloop
-
-; Prints letter in B
-updateLetter:
+	jr	z, .something
+	; nothing
+.nothing:
+	pop	bc
+	xor	a
+	jp	unsetZ
+.something:
 	ld	a, b
-	call	vdpPutC
-	jr	mainloop
+	pop	bc
+	cp	a		; ensure Z
+	ret
 
 .fill 0x7ff0-$
 .db "TMR SEGA", 0x00, 0x00, 0xfb, 0x68, 0x00, 0x00, 0x00, 0x4c