Akai S2000 internal SCSI mod
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.
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.
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 ;)