Made in Japan
IBM SCSI /A's sold in Japan. Some can't be seen on the PS/2 pages.
Long uncached (Trible) and Long SCSI w/c (Spock, older/newer) are not listed here.
Short SCSI A/16
Short SCSI A/16 (New Microcode)
Short SCSI A/32 with Cache (Yellow Terminator Pack)
Short SCSI A/32 with Cache (SIP Terminator Packs)
Half SCSI/A with Cache (50-pin Flat Ribbon Inner Connector)
Half SCSI/A (50-pin header Connector Type)
SCSI A/32 with 2.5" HD
Short SCSI A/16 (P/N 07G3169)
Short length version of uncached SCSI /A with AIC6250EL and old SCSI micro
Long uncached SCSI /A was equipped in PS/55 5570 (analogous to 8580 25 MHz).
I suppose this short card was an optional part for 5530-U/V but not sure.
U2 64F4376 (27C256)
U3 64F4377 (27C256)
U4 84F8233 (27C256)
U7 OKI 15F7917
U10 OKI 33F6910
U11 Adaptec AIC 6250EL
RN1-3 Terminator Register Packs
Short SCSI A/16, P/N 35G2976 (there are several P/N for this adapter)
See explanation HERE.
Short SCSI A/32 with Cache (Auto Termination)
This is the Latest SCSI 32/A, probably an option for 5551-Rxx. Basically
this adapter is capable to handle drive >1G. Unfortunately most of PS/55s
(except 9595 and 8595-J) can't handle IML drive larger than 1G with this
adapter due to BIOS issue. 8595-Jxx (1S1P planar with Type 3 50 MHz complex)
with this adapter can handle HD over 1 GB as IML drive. SCSI ID for IML drive
is not restricted to #6 for this combination.
U2/U7 9336HAK, TC514256AJL-70
U3/U8 9336HAK, TC514256AJL-70
U4/U9 9336HAK, TC514256AJL-70
U5 ODD 92F2245
U6 EVEN 92F2244
U13 Intel N80C188XL 20
RN1 Yellow DIP Terminator
I once fried the F1 fuse when I
attached a Rancho's Single/Differential converter. Really got shocked because
that was the only one "> 1 GB capable card" I had back then. I trolled
around parts shops in Akihabara and got a similar type of tiny chip named
"Poly switch". Electrical specification was a bit different but with the chip
my card revived.
Short SCSI A/32 with Cache (SIP Terminator Register Packs)
U2/U7 9306HAK (T51256T-70)
U3/U8 HM512456AJP8 (cache)
U4/U9 HM512456AJP8 (cache)
U5 ODD 92F2247
U6 EVEN 92F2246
U13 Intel N80C188-16
RN1-3 Register Packs (removable)
RN4 Register (soldered)
2/3 Length Cached SCSI/A (50-pin header Connector Type)
This adapter is an earlier version of SCSI 32/A and was equipped in
5561-W1x/W2x models. SCSI microcode set is 64F4356/57 and it can't handle
drive > 1 GB as ID6.
Probably this is the only one with usual 50-pin flat ribbon inner connector
among all of IBM's genuine SCSI /A for PS/2 and PS/55. But there is another one,
see below for P/N 79F1140.
U1 Adaptec AIC-6250EL
U2/7 M5M4256AL-10 (ZIP RAM)
U3/8 M5M44256BL (Cache, ZIP RAM)
U4/9 M5M44256BL (Cache, ZIP RAM)
U10 BIOS P/N 64F5984
U15 64F4376 EVEN
U19 64F4377 ODD
U18 OKI 15F7917
RN4-6 Terminator packs
J1 DB50 SCSI Header
2/3 Length SCSI/A (50-pin header Connector Type)
Not sure about this one. Maybe uncached SCSI for 5560-W0. Got this one
recently (2003.05.11). This one has 2 internal connectors, one is 50-pin flat
ribbon cable connector and the other is 50-pin edge card connector.
U1 BIOS P/N 84F8233
U2 64F4376 EVEN
U3 64F4377 ODD
U10 33F6910 M91V034 OKI
U24 Adaptec AIC-6250EL
U25 15F7914 M91H048 OKI
RN1-3 SIP Terminators
J1 50 pins SCSI Connector
J2 50 pins Edgecard connector
J3 Extrnal RS6000 style connector
SCSI 32/A with 2.5" HD (P/N 35G3785)
2.5" SCSI HD is mounted on the adapter. The drive is set to ID #6. The stock
HD is WDS280 (80 MB).
U11 intel N80C188-16
U12 92F2244 EVEN
U13 92F2245 ODD
All chips on the PCB are same with short SCSI 32/A with cache P/N35G2818
with Yellow DIP Terminator. Just the parts are reallocated on the PCB.
I'm not sure if I'm correct or totally wrong about the following info.
I tested and experienced by myself thus I wrote. I can't explain
my experience logically 'cause I can't read BIOS or don't have sufficient
documentation about PS/55's SCSI feature.
It is told that PS/55's BIOS lacks,
unfortunately, support for over 1G IML drive. Even if we use 92F2244/92F2245
SCSI BIOS and 10G4890 microcode, PS/55s such as 5580, 5560 and 5551-N
can not accept IML drive larger than 1G capacity. Server models like
9595(Type 4), 8595 (Type 3) and 9585 are capable to run drives > 1 GB
as IML and they are basically same with pure PS/2. In another word,
BIOS ROM in Japanese localized processor complexes ( and planar ) are not
sufficient to take drives > 1 GB as it's IML drive even though we use SCSI
adapters with enhanced SCSI code. We have such nice cards over here
but it's true. It's Ridiculous and Sad..
Group A Adapters not
capable to handle > 1 GB IML drive and/or Boot
Group B Adapters capable
to handle > 1 GB IML drive and/or Boot drive
2) With Cache
3) Not capable to handle partition larger than 1G as a boot drive
4) Capable to handle partition larger than 1G as a boot drive
Flat package. Don't know correct term for the ROM. It's a flat, SOJ type
5580-Y with Type A Upgrade complexes (DX2-66), HD; Seagate ST42400N. Can't
make system partition on the Seagate even with an adapter listed under Group B.
The Seagate drive IDed as 6 off from 35G2818 can't be recognized as valid drive
If I use a smaller drive with ID=6 and make system partition on it, then
change boot order to Seagate 2G in one partition as C, then system works. Here,
if I change SCSI /A to listed under Group A, system stops upon booting with
error message "Missing Operating System". If I change older type of SCSI /A to
newer one again such as 35G2818 or 07G3063, every thing works fine.
If I change Type A Upgrade to Type 3, the Seagate drive off from
35G2818 and 6451280 (both in Group B) works fine
as like as usual PS/2 with Type 3 platform. Also I can give SCSI ID other than
6 to ST42400N.
Conclusion (If I'm correct):
- Pure PS/55s dose not contain SCSI code in it's BIOS or lacks some important
codes relating SCSI.
Server models (5580 and 5560) may handle drives larger than 1 GB
if BIOS ROM could be replaced.
IBM Japan had not ever released such BIOS ROMs nor reference versions.
I'm not a BIOS tweaker.
- SCSI adapters listed in group A can not handle drive larger than 1 GB for
Also it can't boot OS even IML drive is smaller than 1 GB and boot order
is changed to another drive larger than 1 GB in which OS is installed.
- SCSI Adapters listed in group B can handle drive larger than 1 GB for IML
purpose only when it is used with PS/2 complexes
including PS/55 Type 3. In this case SCSI ID for IML drive is not
limited to ID 6.
With Japanese Type 1/2 and dx2-66 upgrades, SCSI adapters in groupe B on
5580/5560 can't do it.
- As a matter of fact, 5551-N can not
handle drives larger than 1 GB as an IML drive even though it has 92F2246/2247
micro code set on the planar.
Why Big Blue Japan deleted SCSI code from machine BIOS?