more work towards floppy directory reading

src/dos_m65/dev_floppy/fs_1581_read_dir.s

@@ -0,0 +1,24 @@
+
+;
+; Hypervisor virtual filesystem - reading directory
+;
+
+
+fs_1581_read_dir_open:
+
+	; Try to read track 40, sector 0 (disk header)
+
+	lda #40
+	sta PAR_TRACK
+	lda #$00
+	sta PAR_SECTOR
+
+	jsr dev_fd_util_readsector         ; XXX handle read errors
+
+
+
+
+
+	; XXX continue implementation
+
+	jmp dos_EXIT_CLC