spp_1284_read
error = spp_1284_read(bus, PPB_NIBBLE, buffer, max, read);
error = spp_1284_read(bus, PPB_BYTE, buffer, max, read);
error = spp_1284_read(bus, mode, buffer, max, read);
extern int spp_1284_read(device_t, int, char *, int, int *);