The SY99 comes with 512K (1K=1024 bytes) buit-in Sample RAM (Random Access Memory). This basic memory can be used to hold samples and/or MDR data.

Information stored in volatile memory will be lost when turning SY99 off, whereas data stored in non-volatile memory will be kept alive by the internal backup battery.

Samples require less sample memory if they are received via MIDI wire using the MIDI Sample Dump Standard (SDS, “Bulk Dump” feature). Saving and loading samples to a 3½” DD diskette will result in a bigger sample size.

Some people say, that it is best to initalize the Sample RAM from time to time, to prevent RAM fragmentation. We couldn'tt prove this, but it won't hurt. Maybe it is best to Initialize the Sample RAM whenever you delete your last sample.