Tatsuo Sunagawa has been
my source (only one, so far) for information on the Japanese IBM microchannel
machines. As you can tell, they are NOT all copies of the EMEA and US models.
Matter of fact, they have some things I wish IBM had here in the US.
It is not PC730 nor 750. It is one of IBM Japan's unique products
and was not sold outside Japan.
Specs of the machine is as follows
W x D x H: 36cm x 40cm x 9.4cm ( including rubbers on each bottom
: DX2/66 or DX4/100, PODP ready.
socket3 ZIF, VRM not required, switchable 5V <----->
3.45V using 6 x 2 jumpers..
System Clock- base clock is changeable 66MHz<----> 50MHz
Memory : 4 simm slots. accept up
to 32MB parity per slot max system memory 128MB
Video : S3-864
1MB VRAM up-gradable to 2MB ( 2 DIP type sockets locates just beside of
on-board VRAM like PC750 ) Original parts used in my machine are KM416C256BJ-6
L2 cache : 128KB silk shows 128K
L2 SUPECACHE IBM 85G4865 labeled as EC:D61570B. also labeled IM96A003544
85G4865 498 Writeback/Writethrough selectable by jumper. CHIP is
SONY CXK78486 1Q-33 448B38EZ. it has also a marking " 80G5454" as if it
is a IBM parts. (Ed. working on an
Drives : 1FDD,
1HDD drive bay, (Sizes?)
CD-ROM drive bay (custom CDD required,
slim hight and short depth ) I'm using a Toshiba 4x drive;
XM1202B, which is for notebook PCs (or laptops). EIDE interface.
This drive has a mini connector used in IDE 2.5" harddrive. so it is easy
to connect to the standard-sized IDE cable using converter. One defect...its
color. Gray color used in Toshiba laptops breaks the total atmosphere of
Bus slots Available : PCI/MCA shared
slot x1, MCA slot x1
> ******modified ISA slot x1 for special PCMCIA
/A with 2 sockets******.
E-IDE Controller. I'm using
6.4gig seagate drive but not sure about the maximum capacity which this
machine can handle.
Micro PCI Connector (?)
Further more this machine has a very unique connector
onboard which is called Micro PCI connector. Only two devices are available
for this connector, one is Micro PCI Ethernet /A and the other is of course
Micro PCI TokenRing /A. I unfortunately have never seen these adapters.
One of my net-friend has one for Ethernet and I really want to get
Small PCI vs. Micro PCI
I do not know it is world-wide standard or not, but according
to my friend, this connector was introduced as " kogata PCI" in IBM's
leaflet issued when PC720 was announced. In Japanese, "kogata"
stands for "small" rather than " micro" though these two words are nearly
same. So I think " Small-PCI interface" would fit to this connector.
(Ed. I have seen ONE adf for an
adapter which hinted that it was a flippable PCI/MCA like the DCA ISA/MCA
or the ATI 8514/A Ultra)
PCMCIA Adapter (s)
You may feel very strange with the adapter used in above
mentioned machine. The adapter of course has ISA connector edge to
mate with the bus above. and same adapter is used for PCI/ISA
version of PC720.
(Ed. There is an ISA 2 slot adapter
version of the PCMCIA Adapter /A)
Adapter has 2 PCMCIA sockets on the card and
additional 2 devices are available through the connectors placed on motherboard.
The PCMCIA controller chip is 54G0574 , compared with the 34G3547 used
on the PCMCIA Adapter /A.
The 2 slot MCA PCMCIA /A is not popular item here in Japan.I've
never seen the adapter ever except the photo image in Don Peter's collection)
According to my friend, PCMCIA sockets
of PCI/ISA version could be used properly on Win98. Hearing
his comment, we all expected that the problem was solved and developed
driver was presented by M$ or IBM Japan. But our poor PCI/MCA version
couldn't run in protected mode and still uses real mode driver only.
This situation is same with TP720C. I have one but
not yet checked inside of the machine. Anyway it is completely same
with yours. TP700/720 series were designed and manufactured in Japan conducted
under Yamato research center and manufactured at both the Fujisawa
and Nozu factories.
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