chartab: migrate to com format and awk assembler

host/asm.awk

@@ -368,7 +368,7 @@ op in alu {
 op=="test" {
   push_op_modrm(132) # 84
   if (!hex) {
-    size=push_op_fixed_spare(246, 7)
+    size=push_op_fixed_spare(246, 0)
     if (size==1) {
       push_byte(getsym(op2))
     } else if (size==2) {

src/chartab.asm

@@ -1,8 +1,4 @@
-	org 0x7C00
+	org 0x100
-
-init	xor ax, ax
-	mov ss, ax
-	mov sp, ax
 
 	mov ax, 0x0e20
 	xor bx, bx
@@ -53,14 +49,10 @@ init	xor ax, ax
 	cmp cx, 0x100
 	jc .line
 
-halt	hlt
+	ret
-	jmp halt
 
 btoa	add al, 0x30
 	cmp al, 0x3A
 	jc .ret
 	add al, 7
 .ret	ret
-
-	times (0x1FE - ($-$$)) db 0
-	dw 0xAA55