N Type 4 Complex
Rf90954a.exe Reference disk for
Type 4 Complexes
Rd9095a.exe Common Diagnostics
for all 859x
/ 959x Systems
"N" /
Upgrade 486DX2 66/33 MHz 61G2343
ECA0002 01291500
Errors
Memory supported, cache,
features
Support for
Convenience Partition
on >3.94GB Drives
BIOS releases
Flash
BIOS 05 from
BIOS 03 or less
BIOS
Level Revison
Features
Diagnostic LEDs
Possible
-xNx Overclock????
-xNx
Upgrades?
Synchrostream on
-xNx?
"N" / Upgrade
486DX2 66/33
MHz 61G2343
CR1,2 Diagnostic
LEDs
J3 Serial
Diagnostics Link to operator panel
J5 Artifact
J6 Unknown
JMP5 FLASH
ROM Bank Switch
U3 BIOS Odd
61G2347
U10 BIOS
Even 61G2350 |
U19,20,26,38,42
KU82490DX cache
U29 A82495DX
Cache Controller
U31 40.0000
MHz OSC- MCA Bus Clock
U33 33.3300
MHz OSC- CPU Bus Clock
U47 50G8192
Not a clue. DMA Controller?
U85 LT1085CT
VRM
0 |
Supports 041xh and 043xh CPUIDs HERE
David Beem put some thought into steppings.
ECA0002
If you get Intermittent 01291500 errors and
intermittent
hangs, or SYS000915 errors under OS/2 using an N complex,
FRU 61G2343,
then this ECA probably applies. NOTE:
the upgrade Type 1 DX2-66 FRU 92F0145 is NOT affected.
To check if your complex is affected, note
the manufacturing
P/N on a sticker just below the CPU. If the manufacturing
number is 82G3513,
06H3368, or 61G4072 with no patch wire on the back
[described below], it
is affected. NOTE: I
have a 61G4072
with a patch wire on the front. It seems to work. But the
U69 and U60 ICs
do not match.
Complexi 06H7263, 06H7264, and 06H7265 with the wire patch
are not
affected.
Complexi with FRU 06H7266 are not affected. [ed.
New level production?]
Wire Patch on Back
There are two ICs, U60 and U69. U60 is 74F04D, 14
pin and U69
is 74ABT374D, 20 pin. The patch wire runs from the top
left of U69 across
to the right, then down to R1, then from the bottom of
R1 to the left,
where it connects to the bottom right of U60. If your
61G2343 does not
match the U69 (74ABT374D) and U60 (74F04D), then this
ECA does not apply.
-xNx
Overclock?
From Tatsuo Sunagawa
The board accepts 40.00M oscillator
instead of 33.33M
without any changes of BIOS. But with 45.00M, it
doesn't work.
I don't have same type oscillator, so I 'm using
square metal
package oscillator with socket.
(Ed. Does
this mean
an AMD/Cyrix 486DX-80 might work? The 486DX-80 was for
systems with a 40MHz
clock.... Watch the voltage! The DX-80 was a 3.45v chip,
FAIK...)
-xNx
Upgrades?
From Tim Clarke
Type-4 DX2-66 will take:
Intel/IBM DX2-66 (5v parts, x2 clocking)
Intel DX2-66ODPR (5v parts, x2 clocking)
All others *fail* to reach 'logo' screen (presumed BIOS
'sensitivity')
But with this possible
overclocking,
Hi Louis,
Yes, the 'sensitivity' I remarked
upon was in relation
to x3 clocking ratios and above, *not* increasing the
'base clock' and
staying with x2 clocking. My initial reaction is
that a 40Mhz x2
(i.e. 80Mhz) chip would work very well, especially those
with the 'bigger'
16KB L1 on-chip cache.
Ed. Please report
experiences... Also,
do be careful- the parts may be able to take the
overclock... Make sure
the side fan works. Keep the complex clean.
Current N Upgrade Attempts
I tried a Socket 3 transplant onto an N
(procedure performed
by Jim Shorney). At the same time, a 40MHz oscillator
was tried. The 40MHz
oscillator wasn't cooperation. At present, the Socket 3
modified complex
will not respond on a 9590. Possibly too crude of a
planar??
Complex refuses to run on a model 90, but
came up on an
M class 95 planar. Still refused to complete booting
with anything other
than a DX2-66. Interposer failed to enable booting with
a POD. Possible
timing or cache related problems.
Is
there a Synchrostream
controller on an N?
> Praytell where is the Synchrostream controller on
the N? I
thought that it was the metal cased chip 50G8192, but
it's used on
the N and the P. And the P has the yellow or blue
SSC....
From Peter-
I'm afraid it hasn't got one. The SSC is a
feature of
the last releases for MCA IBM made before they dropped
it. The Lacunas
have it - and the Pentium T4 have it. I think the -N-
hasn't got it. It
"only" has the normal 40 / 80MB/s MCA interface. (32/64
bit burst mode).
Editor: The Type 3
"M" and the Type 4 "N" both have the SynchroStream
circuitry, but it is in discrete chips.
9595 Server 95 (AKA
"Server 95 466") (Type 4 ref. disk)
1NG - 486DX2-66, 16/256MB (ECC), 540MB SCSI-2, 2.88, 101
KB
1NT - 486DX2-66, 16/256MB (ECC), 1GB SCSI-2, 2.88, 101
KB
1NV - 486DX2-66, 16/256MB (ECC), 2GB SCSI-2, 2.88, 101
KB
9595 Server 95 Array (called
95A) (9 drive bays - Type 4 ref. disk)
3NG - 486DX2-66, 16/256MB (ECC), 3 x 540MB SCSI-2, 2.88,
101 KB
3NT - 486DX2-66, 16/256MB (ECC), 3 x 1GB SCSI-2, 2.88,
101 KB
9595 Main
Page
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