implement fcb search with more efficient segmenting and dta use

com/@rdos.asm

@@ -9,6 +9,7 @@ banner:	db "RDOS KERNEL ", V, 0x0A, 0x0D, '$', 0x1A
 %include "kernel/char.asm"
 %include "inc/bpb.asm"
 %include "kernel/drive.asm"
+%include "kernel/fcb.asm"
 
 section .text
 
@@ -18,20 +19,22 @@ init:	call rstseg
 	mov dx, banner
 	call puts
 
-	mov byte [testbuf], 5
-	mov dx, testbuf
-	call gets
-
-	mov ax, [testbuf]
-	mov cx, [testbuf+2]
-	mov dx, [testbuf+4]
-	mov bx, [testbuf+6]
+	call rstseg
+	mov dx, testdta
+	call setdta
+	mov dx, testfcb
+	call fndfst
 
 	int 3
 
 hlt:	hlt
 	jmp hlt
 
+section .data
+
+testfcb	db 0, "HELLO   ","COM"
+	times FCBSIZ db 0
+
 section .bss
 
-testbuf	resb 130
+testdta	resb 128