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Lord Finesse - The SP 1200 Project - A Re-Awakenig - audio-praxis.de

Lord Finesse - The SP 1200 Project - A Re-Awakenig

Die ultimative HipHop Drum Machine
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FL-Phil
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Lord Finesse - The SP 1200 Project - A Re-Awakenig

Beitragvon FL-Phil » Mi 11. Mär 2015, 17:43

OT- Iknow ;)
Ihr werdet jetzt lachen, der Release ist mir letztes Jahr entgangen. Bin durch iTunes (grauenhaftes Medium) aufmerksam geworden und hatte zum 10.3. vorbestellt. Hat mir gestern richtig Spaß gemacht durchzuhören.

Ich würde ich hute gar nicht mehr auf diese Daten beschränken lassen wollen :D

Architecture The SP1200 is based very closely on the SP-12 and Drumulator, and the technical architecture is very similar, being based on a custom designed micro-controller, a Z80 processor and multiplexed audio. It was also designed to be fully compatible with the SP-12 samples, which can be read in via the cassette interface.

The 8-bit Z80A processor runs at 3.3MHz, it reads the controls, writes to the display, and communicates to the outside world via an Serial I/O chip. It also runs the sequencing software. A CTC (counter timer circuit) is used for generating timing interrupts for scanning the controls every 1.2 ms and keeping the sequencer accurate and sync’d to MIDI or SMPTE.

The micro-controller is the E-mu magic which enables the sample memory to be read for each drum sample. The hardware design was all done by Dave Rossum, and this was the last solo project by Dave.

Sample Memory The SP1200 uses dynamic RAM memory for storing samples. The sample memory consists of twelve 32 Kbytes memory chips (total memory size of 384 Kbytes). The sample memory is actually 16-bits wide, and therefore has some de-muxing to fit 12-bit samples across all the chips. With a sample rate of 26,040Hz the SP1200 has 10.07 seconds of sample time, split over four separate sample banks.

Digital Sampling A 12-bit linear Digital Analog Converter (DAC) chip replays the samples, and is also used for sampling sounds via successive approximation. This saves the cost of an ADC chip. The sample input goes via an anti-aliasing filter to remove unwanted frequencies that are above half the sample frequency, the cutoff is brick walled at 42dB.

Operating System The SP1200 has diskette based OS, which is stored on all sample diskettes when they are formatted. The on board Boot EPROM instructs the micro-processor to load the diskette based operating systm into program memory, which is a mere 64 Kbytes in size and is used as the sequencer memory as well. Sample and sequencer memory are volatile and must be backed up to diskette before you power down the SP1200.

synthark.com

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Re: Lord Finesse - The SP 1200 Project - A Re-Awakenig

Beitragvon Sleepy » Mi 11. Mär 2015, 19:39

Geiles Projekt! Bin auf jeden Fall gespannt drauf .. Hatte die Tage das schon gesehen aber noch nicht gekauft.


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