Several people have asked about an upgrade to the Korg DSM-1. I’ve been researching the OS for this 12-bit successor to the DSS-1.
Several people have asked if the DSS-1 upgrade kit can be installed into the DSM1. It can’t be installed for a number of reasons:
-the DSS-1 uses an 8085 CPU, and the DSM-1 uses an HD64180 (Z80 compatible). The two machines use a different memory map as well as enough different hardware to make it impossible. The sound generation hardware is (mostly) identical though.
Many people think that the DSM-1 lacks the analog filters and VCA’s of the DSS-1. In fact the DSM-1 uses the same chips (NJM2069) and has twice as many of them. However, many of the features of the NJM2069 have been disabled by the design of the analog board. The resonance controls and mixer have been disabled. The 12dB / 24dB switch has been hard wired for 24dB. The DSM-1 lacks enough sample and hold channels to add resonance control. However, the DSM-1 has the capability for all of the DSS-1 analog features, as long as the necessary modifications are made.
The DSM-1 uses a different multisound data structure and program data structure (omitting the DSS-1 parameters like DDL, resonance, sync, bit resolution etc). It does have an ‘import DSS-1’ feature which remaps most of the DSS-1 parameters so the sounds can play.