There is only module that can be used to expand the IBM SCSI Adapter with cache/A from 512K cache to 2MB cache is the IBM P/N 30F5360 / FRU 74X8637, which is a 1MB x 9 bit (Parity) 120ns module *with* IBM-specific presence detection. Also Kingston had their KTM-1000/M30 module which also worked, but is no longer made. The above-mentioned IBM modules can be found on the Mod. 30-286(8530-Hxx or -Bxx) with 80286-cpu - if anywhere at all.

You must use a single-sided 30 pin SIMM. You can solder on some wires and cut some of the traces. The SCSI w/cache uses a peculiar kind of RAS and CAS scheme that resists slapping in any old 30 pin SIMM. http://john.ccac.rwth-aachen.de:8000/misc/ps2cache/ If you use incompatible 30 pin SIMMs, the system will disable the cache. You will see "0KB" of cache under "Change Configuration". Don't despair. Replace the original 512K cache.

You need the IBM CD Rom driver and ASPI4B.sys to do this. Two places to get info are http://62.253.119.146/ohland/FAQ/CDROMII.html#W95_Boot_Hack which has Dos and W95 autoexec.bat and config.sys examples, and http://members.aol.com/mcapage0/problem1.htm#probl06 which has the more involved method. Do you need IBMCDROM.SYS and ASPI4B.SYS (email me)? This way you can get the device drivers and edit the autoexec and config yourself without finding or creating a 720KB floppy...

I have just bought a third-party SCSI cable for my PS/2, and it works. It allows you to connect the 60-pin PS/2 SCSI adapter external connection to any device with a standard 50-pin Centronics connector. So, there are three options for getting this type of connector. By the way, the PS/2 SCSI connector is the same as the one on the RS6000. Of course, the alternative to all this is to use an internal SCSI device, if possible.

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Thankfully, IBM followed most of the ANSI SCSI standard. Any common SCSI-1 (50 wire) cable will work. Just remove the connector that attaches to the SCSI controller and replace it with a crimp-on 50 pin edgecard connector. Note that Pin 1 is toward the mounting bracket and is on the circuitboard side! The "true" IBM afficianado knows that the SCSI cable exits the controller's connector to the side without components.

Any .025 pitch cable with HPDB68 drive connectors will work (called SCSI-3), but the IBM F/W SCSI adapter's Fast/Wide internal port uses the "P" connector. (Molex 71660, AMP 1-557089-2) also called a VMC (VESA Media Channel) connector.

If you don't have any SCSI devices attached to your Buz, or you don't use them from DOS, there is no reason to put up with the long "Iomega Jet SCSI" BIOS sequence. This is where the machine probes the Buz SCSI bus for devices at boot time, before Windows starts. To disable this boot-time probe, remove the EPROM on the Buz! The 64k EPROM on the card contains the BIOS boot code for the SCSI controller. If you don't have SCSI devices, you don't need it.

The newer AIC789x series Adaptec chips are supported under the CAM SCSI framework which made it's debut in 3.0. Patches against 2.2-STABLE are in ftp://ftp.FreeBSD.org/pub/FreeBSD/development/cam/. A CAM-enhanced boot floppy is available at http://people.FreeBSD.org/~abial/cam-boot/. In both cases read the README before beginning.

There are 2 general ''versions'' of the 742a card. They are hardware revisions A-G, and revisions H - onwards. The revision letter is located after the Assembly number on the edge of the card. The 742a has 2 ROM chips on it, one is the BIOS chip and the other is the Firmware chip. FreeBSD does not care what version of BIOS chip you have but it does care about what version of firmware chip. Buslogic will send upgrade ROMS out if you call their tech support dept.

This is basically a known problem. The EISA on-board SCSI controller in the HP Netserver machines occupies EISA slot number 11, so all the ''true'' EISA slots are in front of it. Alas, the address space for EISA slots >= 10 collides with the address space assigned to PCI, and FreeBSD's auto-configuration currently cannot handle this situation very well. So now, the best you can do is to pretend there is no address range clash :), by bumping the kernel option EISA_SLOTS to a value of 12.

Yes you can. I have successfully used the 4020i with an Adaptec 1542CF controller. The only change that I had to make was in the SCSISelect utility. Upon getting into SCSI select, you will need to select Device Configuration. Then go to the ID that the 4020i is on (default = 2). Where it says YES for FAST SCSI, change it to say NO. If you attempt to burn CDs when this is set to YES, you will run into mysterious Buffer Underrun Errors. I don't know why this causes buffer underruns, but it do...

This is included here because it's a Frequently Asked Question, but... it's completely nonsensical. The Buz is a SCSI controller, not a SCSI target device (like a tape drive or hard disk). If you're asking this question, you probably have a misunderstanding of how the Buz device looks and works. And now, for the technical nit-picking..

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