Can I use the USB interface to attach a CD reader or writer?
No: currently, the MPC1000 has no USB Master capability, it can only be a Slave to another device, typically a PC. This is a limitation of the Renesas SH3-DSP CPU i.e. it’s not possible that a firmware update will change this. In general, USB devices with the smaller B-type ports, like the MPC1000, are slave-only devices.