The libconio_arch-small is architecture-depend implementation of console I/O with minimum size for the server mode.

platform/pc-6001/ctk/libconio_arch-small.cS

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+;;; 
+;;; 
+;;; libconio_arch-small.hS
+;;; 
+;;; Architecture depend libconio implementation.
+;;; This assembler source contributes basically saving for speed and memory.
+;;; 
+;;; @author Takahide Matsutsuka <markn@markn.org>
+;;; 
+;;; $Id: libconio_arch-small.cS,v 1.1 2007/09/30 12:46:34 matsutsuka Exp $
+;;;
+
+	;; uses preprocessor to enable definitions
+#include "ctk_arch-def.h"
+
+	;; export symbols
+	.globl	_clrscr_arch
+	.globl	_libputc_arch
+	
+	.area	_DATA
+_screen_offset::
+	.ds	2
+
+	.area	_CODE
+	
+_libconio_arch_small_start::
+
+_clrscr_arch:
+	ld	hl, #0
+	ld	(#_screen_offset), hl
+	ld	hl, #VRAM_CHAR
+	ld	bc, #VRAM_CHAR + #SCREEN_HEIGHT * #SCREEN_WIDTH
+_clrscr_arch_loop1:
+	ld	(hl), #CH_SPACE
+	inc	hl
+	ld	a, h
+	cp	b
+	jr	nz, _clrscr_arch_loop1
+	ld	a, l
+	cp	c
+	jr	nz, _clrscr_arch_loop1
+	ld	hl, #VRAM_ATTR
+	ld	bc, #VRAM_ATTR + #SCREEN_HEIGHT * #SCREEN_WIDTH
+_clrscr_arch_loop2:
+	ld	(hl), #COLOR_NORMAL
+	inc	hl
+	ld	a, h
+	cp	b
+	jr	nz, _clrscr_arch_loop2
+	ld	a, l
+	cp	c
+	jr	nz, _clrscr_arch_loop2
+	ret
+
+_libputc_arch:
+	ld	hl, #2
+	add	hl, sp
+	ld	a, (hl)
+_libputc_asm::
+	push	af
+	ld	hl, (#_screen_offset)
+	ld	bc, #SCREEN_HEIGHT * #SCREEN_WIDTH
+	ld	a, b
+	cp	h
+	jr	nz, _libputc_arch_putc
+	ld	a, c
+	cp	l
+	jr	z, _libputc_arch_scroll
+_libputc_arch_putc:
+	ld	bc, #VRAM_CHAR
+	add	hl, bc
+	pop	af
+	ld	(hl), a
+	ld	hl, #_screen_offset
+	inc	(hl)
+	ret	nz
+	inc	hl
+	inc	(hl)
+	ret
+_libputc_arch_scroll:
+	push	de
+	ld	hl, #VRAM_CHAR + #SCREEN_WIDTH
+	ld	de, #VRAM_CHAR
+	ld	bc, #SCREEN_HEIGHT * #SCREEN_WIDTH - #SCREEN_WIDTH
+	push	bc
+	push	de	
+	ldir
+	pop	de
+	pop	hl
+	push	hl
+	ld	(#_screen_offset), hl
+	ld	b, #SCREEN_WIDTH
+	add	hl, de
+_libputc_arch_scroll_loop:
+	ld	(hl), #CH_SPACE
+	inc	hl
+	djnz	_libputc_arch_scroll_loop		
+	pop	hl
+	pop	de
+	jr	_libputc_arch_putc
+	
+_libconio_arch_small_end::

platform/pc-6001/ctk/libconio_arch-small.h

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+#ifndef __LIBCONIO_ARCH_MSLL_H__
+#define __LIBCONIO_ARCH_MSLL_H__
+#include "contiki.h"
+
+void clrscr_arch();
+void libputc_arch(unsigned char ch);
+
+#endif /* __LIBCONIO_ARCH_MSLL_H__ */