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Akai S900

 

 

 

akai s900

info Country: Japan
Weight: 11 Kg
Dimensions: 482,6 X 132,6 X 410 mm
audio demo trend price : 300€
manual factory patch demo video comments
Akai S900
Midi Digital Sampler (1986)

 

Rackmount sampler of the eighties, still widely used for powerful sonic character and raw DACS converters

s900
logo

info RACKMOUNT Main S900 panel features a 40 x 2 backlit display, 29 buttons, 3 knobs and a data rotary encoder.

Front panel terminal connectors:
- Mic / line inputs
- pedal trigger play

Back panel terminal connectors:
- 8 individual outputs
- stereo main out
- Midi interface
- custom voice connector to link Akai compliant synths like VX or AX series all but poly-synthesize AX-80.
Note: old 2-progs power cable, you can still mod it to standard one.




edit SAMPLING core based on a 8-bits CPU NEC manages 8 voices polyphony.
The monophonic sampling engine works at 12 bits resolution and relative DAC is a BA9221 (also some BA9201) which is the same found on famous Yamaha DX7 with different frequencies modes:
- from 7,5 kHz for 63 sec. max
- to 40 kHz for 11.75 sec. max
A single sample can be stretched up to a maximum of 6 octaves with famous high-quality Akai interval algorithms; special Warp pitch allows to time-stretch a section.

 

s900 time


editEDIT a single or more samples must be placed in a keygroup and once mapped, they this make a a program. Each Keygroup features individual parameters such as:
- Midi channel
- zone assignment
- EG amplitude
- LFO amplitude
- VCF cutoff
- volume
- velocity switch.


tech


edit SAMPLE IMPORT it is possible to sample dump handshake over Midi which is NOT compliant to standard SDS protocol and requires special dedicated softwares.
It is also possible also to use the RS-232C parallel port with old communication soft, but I do not have much information about this protocol, but a dedicated software is dedicated for this task PIC.



midi transmission




filter FILTER
non-resonant filter based on a MF6CN a switched capacitor VCF a kind of an hybrid analog-digital offers -12dB/ Oct. slope. The VCF section also features a simple key filter function for keyboard note tracking on octaves.


analog filter



lfo LFO
a single delayed triangle modulator vibrato with special "desync" option emulates natural acoustic vibration feeling.
TIP: the LFO is triggered by modulation wheel or assigned to aftertouch.


ADSR


adsr ENVELOPE based on VCA BA6110 a 4-segments EG amplitude for each sample in keygroup + 1 EG overall amplitude bias for keygroup. The special positional crossfade tracks the amplitude up to +50% toward lower or higher octave.
TECH: a second EG for filer is available when using OS 4.0.


ADSR




diskSTORAGE floppy disk drive format 3"5 DD 720 Kb capacity.
The disk volumes are formatted at 800 Kb in Akai proprietary file system, thus the file system is not directly MS-DOS compatible, however ome third-party programs handle AKAI file system from PC computers. Today it is possible to replace standard drive with a third part USB floppy emulator like HxC.


ADSR


adsrOS most common is 1.2 version burnt into EPROM chip which is able to boots higher 4.0 with floppy disk. The lastest OS4 adds more extra features like s900 timestretch, crossfade and a second EG for filter.
*IMPORTANT* the EPROM OS 1.0 does NOT have boot option so new EPROMS are required to access 4.0 by disk. *DOWNLOAD* S900 OS4 BOOTDISK TELEDISK IMAGE*


os4



adsr MAINTENANCE / MODS
the inverter NEL-D32-43 power supply gets faulty and creates troubles with backlight; for replacement you can adapt a standard cheap display so do NOT get ripped by guys on Ebay: S900 / S950 displays replacement are STANDARD and cheap.
TECH: Also check out capacitors, bad soldering and click pops, take a look to this nice video tutorial about BAD RAM issues.


s900 inverter
inverter NEL-D3243 issues

new display
new display


 

edit MEMORY:
- 750 Kb sampling RAM (cannot be expanded)
- 32 samples
- 32 programs
- 16 keygroups.

akai s900 memory board
S900 memory board

 

 

edit EDITOR just some old program around:
- Soundfiler ST S900 by drumware (ATARI ST) PIC
- Akaisex converts between 12 and 16 bits akai samplers format (ATARI ST) PIC
- Akai ZEROX (ATARI ST) PIC

 

atari st s900 editor

 

 

adsr AKAI S900 EXPANSION BOARDS:

ib101a Ib 101a interface for Atari hard disk - special ASCSI (not SCSI standard! ) Atari volume hard disk.
ask-90 board Marion Ms9c - upgrade board to 16 bits resolution.
ask-90 board ASK-90 external trigger board- triggers 8 voices from external signal.

adsr ASK-90 TRIGGER CARD FOR SALE at 150€ - INQUIRE



 

adsr AKAI S900 vs S950 both machines sound the same.
What's the difference between akai s900 and s950? The s950 features a better floppy drive with higher density 1.44 MB, higher sampler rate, optional SCSI and digital interface and memory can be expanded. The S-900 need OS4 for time stretch function and EG2- However the ASK-90 is a must have expansion for analog sequencer and this feature is compatible only to S-900.


s900 vs s950


 

adsr AKAI S SERIES RELATED FAMILY OVERVIEW:

akai s612 S-612 (1985) the legend started here!
akai s700 S-700 (1987) upgrade version of S-612
also exists in keyboard version X-7000.
It seems that a model called X-3700 was a never-released prototype... or a plain hoax?

s950

S-950 (1988) is the S-900 updated version keeping same sound. Memory can be expanded to 2.25 MB, disk drive is now HD and DD, second ADSR and different expansion options.

akai s01 S-01 (1987) budget sampler, basic display no SCSI.
S-20 laptop version and Remix16 (and japanese 88) with improved options and memory.
akai s1000 S-1000 (1988) 2nd generation cd quality and SCSI
S-1100 boosted model comes with many optional boards and HD recording.
S-1000KB is the S-1000 keyboard version
S-1000PB playback, just plain sample reader.
akai s2000 S-2000 (1995) budget sampler between s1000 and s3000 series
akai s3000

S-3000 (1996) 3rd generation.
- S3000XL was an update with extra (SCSI, digital)
- S2800 cut-down version
- S2800I with SCSI standad
- S3200 added filter board + optional boards
- S3200XL all optional
- 3000CD includes a cd player
- 3000I with SCSI standard

akai s5000 S-5000 (1998) 64/128 voices, optional USB, digital I/O.
S-6000 was even bigger with some standard option and detacheable display, last of the S series then replaced hen by Z family like Z4 and Z8.

 

 

effet VST PLUGIN / SAMPLED VERSION some free samples disk resources and some plugins, however there are no official PLUGIN version of S900 sampler, but some interesting related programs:

  name demo
s900 free disks


s900 S950 Soundlibrary Image DISKS

FREE

n/a
EFM Oddse AKAIZER
FREE
AKAIZER


demoAUDIO DEMO

demo Disk SL-516 "Ooos" choir
demo Disk SL-515 "Glass Bell"
demo Disk PSL9046 "Hammond"
demo Disk PSL9005 "moog" with cutoff demo
demo Disk PSL9025 "Linn drum"
demo Disk SL-554 "Latin percussions"
demo Sampling with DSI TEMPEST
demo Sampling with Commodore 64
demo Sampling with ROLAND TR-909
demo Sampling with YAMAHA DX-7
demo  
demo Contribute please do send yourS900 beats


video VIDEO CLIP SELECTION

AKAI S900 - Beat Making Akai S900 Vintage Sampler Demo S-900 VIDEO MANUAL
- Beat Making Vintage Sampler Demo VIDEO MANUAL

 

sampler s900

 

Company: Akai
Model: S-900
Class: Sampler Module
Dates: 1986
Price: 300€
Synthesis: sampler
Resolution: 12 bits
S. Rate: 7,5-40 kHz

Polyphony: 8
Filter: low pass
LFO: 1
Memory: 750 kb
Demo: 10

 

s900 high res

 

manual
MANUAL

 

analog filter
SERVICE MANUAL

 


adsr

I remember an old ATARI ST program that tranforms samples from S900 to harmonics for Kawai K5 / k5m additive synthesizer. Any idea?
CONTACT.

EFM Oddse

 


title

 

 

akai s900 advertising
adsr original brochure

 

akai s900 scanning
adsr original brochure


akai s900 sampler
adsr original brochure

 

akai s900 sampler
adsr original brochure

 

s900 crash!
adsr adsr OS CRASH !

 

 

title

 

S900 FOR SALE:

akai s900CHECK OUT EBAY OFFERS

 

title

 

 

titletitle

audio demo motherboard chip

Company: Akai
Model: S-900
Class: Sampler Module
Dates: 1986
Price: 300€
Synthesis: sampler
Resolution: 12 bits
S. Rate: 7,5-40 kHz

Polyphony: 8
Filter: low pass
LFO: 1
Memory: 750 kb
Demo: 10


comment
OLDSCHOOL CULT

REVIEW "Sounds very good and raw. Classic sampler ever! "

manual manual
- great 12 bits sounds -bulky
- cult
- storage
  -polyphony
  -memory


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Akai s900 4 out of 5 based on 49 ratings. price €200