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 

P90 Platform 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 Drives
BIOS releases
    Flash BIOS 05 from BIOS 03 or less
    BIOS Level Revison Features
FDIV Replacement
178 Error
06H3739 vs. 06H7095
Upgrade Information  Dated!

"Y" / Upgrade Pentium 90/60 MHz   06H3739 The vaunted P90 complex "Cubrun"


CR1,2 Diagnostic LEDs
J3 Serial Diagnostics Link to operator panel
J5 Serial link
J6 Unknown
JMP5 Flash ROM Bank switch leave alone
U10, 12, 15, 16, 18 Cache Chips i82492-60
U13 87X0079 ??
U17 i82497-60 Cache Controller
U23 10G3441 Synchrostream Controller-
U24 DMA Controller??? 8190587
U27 LT1085CT voltage regulator
U75 LT1084CT voltage regulator

U23 10G3441 Synchrostream Controller- may be yellow (early) or blue (fixed). I have a ceramic version and Peter has seen a metal capped one. Version trivia

8/64MB Parity, 8/256MB ECC 72-pin SIMM, ECC or Parity 70ns Presence Detect
Cache: 8kb L1, 256kb write-through L2 cache (P60, P66, P90)
* 40 MB per second streaming data transfer.
* Error Checking and Correcting (ECC) memory controller
* 20 MHz DMA; 32 bit can directly address all memory, supports Subsystem Control Block.
* Faster bus arbitration (than Base 1) for busmaster performance.
* Enhanced Dual Path Memory
* Subsystem Control Block enabled
* Vital Product Data support.
* Synchronous Channel Check support
* 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 OK.
   Oh yeah, QCONFIG told me the old BIOS revision level was 03.

06H3739 vs. 06H7095

 There are two FRUs for the P90 complex-

 If you go to the EPRM it says:
 (wrong Pentium® 90MHz Processor Card !) 06H3739
 Pentium® 90MHz Processor Card                 06H7095

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).

Upgrade Information
From Peter
   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 Adapter Kit 
   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 Cpu

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