Akai S2000 internal SCSI mod

Akai S2000, My First Sampler™ ! Coupled with Amiga 1200, this baby was the backbone of my older works like ‘Italiano’ (more commonly known from ‘Dose 2‘), or the Outer Space Alliance album.

Not much modding into this, just solder a connector to the S2000 main board and hook up the drive. Midicase has documented the process, so I’ll spare myself from all the typing and just do a few pics.

No need to get fancy with proper IDC connectors..

..but it’s good to get a little neat with the cabling, so as not to obstruct airflow near heatsink (gets hot to touch).

The drive I installed is a SCM PCD-50B, a SCSI card unit with slots for PCMCIA, CF, Sony Memory Stick, SD and Smart Media cards. Most of this functionality is useless though, as the S2000 SCSI doesn’t support LUNs and can thus access only the PCMCIA card slot (LUN0).. But as CF and SD to PCMCIA adapters are available, two of the most popular formats are covered anyway.

Ready to PCMCIA

Jim Atwood’s nice article about his experiences with using S2000 and SCSI drives. http://jimatwood.wordpress.com/2011/05/17/akai-s2000-sampler-connections/

To expand.. or not

Whilst adding the SCSI header, I also was planning to add a “fully working” IB208P output expansion board I got off Ebay. “Was planning” were the words indeed, as after installing the card my S2000 had only 2Mb memory instead of 32Mb, SCSI was slow to access drives and the Akai OS crashed at random. Whatever the card was doing, it sure put good effort into interfering with processor activity on the main board! Fully working, yeah right.

Prior to installing the board, I had reverse-engineered some of the bus connector pins (W501) out of curiosity; I occasionally do this kind of stuff just to brush up on my circuit reading skills (or whatever).  The fault prompted to continue with the task a little; surely whatever part was causing the problem had to sit in direct contact with W501 to affect the main board. Indeed, with some further probing the culprit turned out to be a 74HC86 quad OR chip, that is eg. responsible for creating the 74HC244 buffer _OE signaling. Replaced the ’86 and voilà: 32mb of memory, proper SCSI operation, no OS crashes and additional outputs installed, like it should be!

If you wish to look at my IB208P reverse-engineering notes, get them and IC datasheets here. Don’t forget to say thanks if they prove useful ;)

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15 responses to “Akai S2000 internal SCSI mod”

  1. andoni graham says :

    Hi man, i appreciate you writing about this mod. i have a s2000 aswell. And i love the machine, i’ve got it upgraded with the 8 output board, and want the best out of it, but concerned about the floppy drive dying. i unsuccsessfully tried contact the other party with no success, and attemped buy connectors, but they were the wrong ones. Do you have any info on what icd connector you need for the scsi drive? Please email me, many thanks Andonigraham@aol.com

    • andoni graham says :

      PS: That a cover or remix above, or is that the orignal you did? i “forking” loved that tune lol, always remembered it putting a smile on peoples faces, and remembered it on mtv at some point :)

    • Arto says :

      Do you have any info on what icd connector you need for the scsi drive?

      What you need is a male 50-pin IDC connector or a double-row breakaway pin header with 2.54mm (100-mil) pin spacing. The IDC connector is recommended if you wish to ensure that SCSI cable can’t be inserted the wrong way around.

      On my mod I used the breakaway pin header and the part looks like this: http://www.pololu.com/catalog/product/966. You of course need to trim this down (= “breakaway”) to the required length (25 pins).

      • Chris Poacher says :

        Hi there, great page and info. I’m looking to do this mod to my S2000, just a quick question, which was the best way to remove the solder from pinholes on the pcb? did you have to remove all with solderbraid first or is it possible to rest the breakaway over the holes and add heat from the top to gently push it down? :)

        • Arto says :

          just a quick question, which was the best way to remove the solder from pinholes on the pcb? did you have to remove all with solderbraid first or is it possible to rest the breakaway over the holes and add heat from the top to gently push it down? :)

          I’m lucky enough to have a desoldering station, but braid should work equally well. Just take care not to apply excess heat on solder pads to lessen the risk of breakage.

          Heat gun isn’t an option for tasks like this: as you’re unable to control the heat precisely, you’d likely end up with a molten blob of plastic on your S2000 pcb. You would also expose the pcb and nearby parts to mechanical stress in form of thermal difference, as one small area of the board gets heated to extremes while adjacent ones stay more or less at room temperature.

  2. Chris says :

    Hi again, Managed to remove the solder with a sucker in the end. https://picasaweb.google.com/106616528507552850933/AKAIS2000MODS#

  3. Jason Stockton says :

    Hi, I’m interested in the mod you carried out on the Akai S2000. Did the SCM PCD – 50B work ‘OK’ ?????? You mentioned in your blog that the SCSI was slow & had OP / System problems. Was this due to the fitting of the SCM PCD-50B or is that related to the fitting of the IB208P Expansion board ?????

    • Arto says :

      You mentioned in your blog that the SCSI was slow & had OP / System problems. Was this due to the fitting of the SCM PCD-50B or is that related to the fitting of the IB208P Expansion board ?????

      Yeah the PCMCIA slot on the drive (LUN0) works fine with a CF adapter. Didn’t get it working with a SD adapter.

      The slowness and crashing were related to the IB208P which was faulty, so nothing to do with the drive itsef.

      • Jason Stockton says :

        Hi, that’s great….!!! I’ve ordered a SCM PCD – 60B & a PCMCIA SD adapter. The SD adapter didn’t work ??? I’ll have to get my hands on a CF adapter instead. Did you have any power supply problems ???? (ie, fuses blowing ) & does the external SCSI connector function as normal do you know ????? i want to get the stuff off my ‘Zip’ disks & on to the SCM PCD wether it be SD or CF. I can honestly say ‘Zip’ disks have been pretty good to me but I have had the odd one fail. Drive’s & disks…… !!!

        • Arto says :

          Did you have any power supply problems ???? (ie, fuses blowing ) & does the external SCSI connector function as normal do you know ?????

          Have had no power supply problems whatsoever. External SCSI works just fine, I have a CD-ROM hooked up. Just remember to set the SCSI IDs, PCD-60B should be ID 5 as the S2000 can’t boot off other IDs. The external drive can be whatever.

  4. Jason Stockton says :

    Thanks Arto, totally appreciate your information……………!!!

  5. Bert says :

    Dear,
    i want to put a scsi hd into my s2000. Is it possible, to use the inernal 12 V of my akai?
    thanks

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