Y Type 4 Complex
194-360 IBM PS/2 90MHz Processor Upgrade Option
with Pentium Technology
Rf90954a.exe Reference disk for Type 4 Complexes
Rd9095a.exe Common Diagnostics for all 859x
/ 959x Systems
Type 4 Common Devices
Tuning by Peter Wendt
P90 Complex Technical
Considerations by Jim Shorney
"Y" / Upgrade Pentium 90/60 MHz 06H3739
Memory supported, cache, features
Support for Convenience Partition on >3.94GB
Flash BIOS 05 from
BIOS 03 or less
BIOS Level Revison
06H3739 vs. 06H7095
Upgrade Information Dated!
"Y" / Upgrade Pentium 90/60
MHz 06H3739 The vaunted P90 complex "Cubrun"
Synchrostream Controller- may be yellow (early) or blue (fixed). I have
a ceramic version and Peter has seen a metal capped one. Version
8/64MB Parity, 8/256MB ECC 72-pin SIMM, ECC or Parity 70ns Presence
Cache: 8kb L1, 256kb write-through L2 cache (P60, P66, P90)
* 40 MB per second streaming
* Error Checking and Correcting (ECC)
* 20 MHz DMA; 32 bit can directly address all memory, supports Subsystem
* Faster bus arbitration (than Base 1) for busmaster performance.
* Enhanced Dual Path Memory
* Subsystem Control Block
* Vital Product Data
* Synchronous Channel Check
* Data bus parity support
* A logging facility is provided (for ECC or system errors)..
178 POST Error
Laust Brock-Nannestad cried:
I managed to get hold of one of the much sought after
P90 complexes (FRU 06H7095), but when I put it in my 9595A (replacing a
P66 complex), it gives me error 0001 7800 and halts.
God Emperor of Microchannel replies:
Flash to 05 or higher. The update flash disk doesn't depend
on any level of refdisk in order to work.
Laust does cartwheels and says:
Success! This was exactly what I did. I booted the 8595
with the flash disk and it proceeded with the upgrade. Upon the next reboot,
I got the friendly IBM SurePath boot screen and then errors about the invalid
complex (which were at this point, to be expected). Configured with the
Ref disk, rebooted.
Everything was fine. Then I put the complex back
in the 9595A and it booted, completing POST for the first time. After reconfiguring,
the machine now boots like normal (and the 90MHz on the front looks rather
sweet ;-) Next is adding back the cards (It's currently stripped
down to just the XGA-2 and processor complex), but it seems to be working
Oh yeah, QCONFIG told me the old BIOS revision level was
There are two FRUs for the P90 complex-
If you go to the EPRM
(wrong Pentium® 90MHz Processor Card !) 06H3739
Pentium® 90MHz Processor Card
Oliver Schweizer said
I once called the spare part hot line and they told me
that the 06H7095 is intended just as a replacement for a crashed complex.
According to them the number change came because the original complex could
contain the bug-ish P90 and the replacement unit not. If I remember correctly
they asked about 1500-2000 $ for the 06H3739!! A real tempting offer ;),
but after weeks of sleepless nights I decided to stick with my type 2 complex
(and got the pentium power now for about 5% of that price).
FYI: I reworked a P90 platform today with a wire (and
two solderings) and stuffed in a P-200 Non-MMX. Worked fine so far. Didn't
have an appropriate heatsink at hand, so I cannot say anything on the long-term
stability and any nasty side-effects.
At the moment I'm soldering a DIP switch onto the P90
platform to set BF0/BF1 accordingly to whatever core/bus ratio is needed.
Maybe I install an adjustable clock generator on that thing too ... but
I lack the time a bit.
Something I found out during my experiments: a platform
with an 80497-60 reacts rather funny with higher speed CPUs. I stuffed
in an 80496-66 and it worked much better. Got some silly cache errors (0129
xxxx) with the 497 cache controller. And the output voltage on the CPU
regulator dropped to 2.5 Volt from 3.3 ...
No explanation at hand for that strange behaviour (yet).
P90 to 180 MHz W/O Soldering
Involves soldering a wire between three pins on an interposer
(PGA LIF socket). It's called a "Terminauter" after the hacker. Look HERE
CM-174 Universal Adjustable Clock Multiplier
Originally tried and reported by Carroll Bloyd. After
working fine for a short while, the complex died. For the info, look HERE
PL-ProMMX Iinterposer from Power Leap
Reported by Luigi Zambotti
At last I succeded to put some power in my 8595. After
having replaced the 60MHz crystal with a 66MHz type (from Digikey.com)
I purchased a PowerLeap PL-ProMMX
interposer, put on it an Intel 200MHz CPU (not MMX!) and everything worked
fine from the beginning.
Power Leap Units that Failed
Reported by Luigi Zambotti
I have also tried:
1. Evergreen Spectra 233 but it didn't worked;
2. PowerLeap PL-ProMMX interposer with an Intel 233 MMX Cpu
3. PowerLeap PL-K6-III interposer with a WinChip 200Mhz