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#Mitsumi quick disk usb full#
#Mitsumi quick disk usb software#

/WRITE PROTECT – indicates whether the disk is write protected or not.QD Interface The interface to the QD consists of 10 lines: Partial read is controlled by the OS and is not a QD function.

#Mitsumi quick disk usb full#

Verified Write – checks whether there is sample data or its an empty disk then writes the complete sample bankĮssentially the QD needs to do only 3 things partial read, full read or full write.

Full Write – writes the complete sample bank.

Monitor Read – reads just the sample bank name and structure.

Full Read – reads the complete sample bank.

There is no formatting of the disk, as it has no sectors.

Use Cases The QD in the Roland S-10, MKS-100 and S-220 has only a few use cases The sample bank can have a name which is 9 alphabetical characters which is stored as two hex characters.

#Mitsumi quick disk usb software#

This is remarkable short compared with today’s software sampling but it is the same wave memory size the Emulator 1 used in 1981 at a cost of $10k.

The samples are replayed via a 16-bit DAC at 15 or 30 kHz, which provides 2.18 seconds or 1.09 seconds of sample time per bank. Each side of a QD can hold 64k bytes, which is split into … So a full memory load means 2 disks and 4 load operations. The limitations of the QD storage size means Roland had to split the sample memory into 4 banks, with each bank requiring a single side of a QD. The 29 items of wave data control how the sample is played back loop points, envelope settings, auto bend etc. A disk side therefore contains 64k bytes of sample data and up to 8k bytes of wave and performance data (which is held in a 64k bit SRAM backed up by the battery). Because this data is stored in 8 bit bytes on the QD the 12-bit sample data is stored as 2 complements in 2x 8 bit words onto the disk. Sample Memory The wave memory is built from six HM50464P 64kx4 bit DRAM chips, which provides 128k of 12-bit sample storage in total. The different amount of parameter data does not affect how the QD works or is emulated.

Type I – S-220 All Information (F2 pushed during save).

The S-220 OS recognizes three types of sample disk: Variations The S-220 introduced the capability to store more parameters as it introduced new capabilities beyond the S-10 and MKS100. You can also preview the name of the sample before loading the disk. However you can choose to just load the sample and wave data and not the 26 performance parameters, if you want to keep the original settings. When a QD disk is loaded it moves the sample data as 12-bits into DRAM wave memory and replaces the current 8-bit wave and performance parameter values in the SRAM chip with the new ones. How the data is stored Each side of a QD contains one bank of 64k bytes of data which contains sample data, wave parameters and the performance parameters and split points. One of my background projects is to create an micro processor emulator, as I have 3 of these samplers. Overview The Quick Disk drive in the early Roland samplers is prone to failure and long since obsolete.