OBJS = ram:a.o ram:b.o ram:c.o
SRCS = $(OBJS:"ram:*.o":"*.c")

all: $(OBJS)
    Echo "$(SRCS) $(OBJS)"
    cd ram:
    dir
    Echo "$(OBJS:"ram:*":"*")"
    cd
    dir

$(OBJS) : $(SRCS)
    Echo "cc %(right) -o %(left)"