Y Type 4 Complex
Refdisk and Diags
   Memory supported, cache, features 
BIOS releases
    Flash BIOS 05 from BIOS 03 or less
    BIOS Level Revison Features
FDIV Replacement
Diagnostic LEDs
Serial Data Link
 "Y" / Upgrade Pentium 90/60 MHz   06H3739

Refdisk and Diags

Reference Disk for Type 4-
Diagnostics for Type 4- (Common to all complexes)


Min/Max on system board: 8/64MB Parity, 8/256MB ECC
RAM: DRAM (PS/2 72-pin SIMM, ECC or Parity) 70ns
ROM: 128kb 
Cache: 8kb L1, 256kb L2 (P60, P66, P90)
* 40 MB per second streaming data transfer.
* Error Checking and Correcting (ECC) memory controller
* 256KB Level 2 memory cache (write-through) on Pentium complexes, 128K on DX2-66
* 20 MHz DMA; 32 bit DMA can directly address all memory
* DMA 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)..

BIOS Releases
Trying to flash BIOS 5 and up from 03 or Lower
Complex BIOS Levels
FDIV Processor Replacement

Pentium® processor Replacement (FDIV) Information 
  If you have a -xPx or -xQx complex (even the mighty -xPx), chances are it has the FDIV bug. Intel will swap out your processor with a like processor. Same speed. No upgrade for the FDIV chip is available. Read the stuff on this link. It will give you the phone# and the requirements for swapping the chip out (Includes the CPUID program to identify the presence of the FDIV bug). You will have to give them a credit card number.
   They will send out a non-FDIV chip and a pre-paid shipping envelope. You pop the old chip out and return it to Intel. If they do not receive the old chip within 30 days they will charge the credit card number.
  I had my replacement in under a week of my call....

Diagnostic LEDs (Extrapolated from the Type 3 information)
   The Type 4 processor board  has two LEDs; one in position CR1, and one in CR2. 

Serial Data Link

"Y" / Upgrade Pentium 90/60 MHz   06H3739

The vaunted P90 complex
10G3441 Synchrostream Controller- Blue translucent chip. Can be yellow or blue. Though I have not seen any yellows myself, it may happen. Currently investigating if there is any meaning to this difference as is the case with the 76/77 planars.
U24 DMA Controller??? 8190587
Cache Chips i82492-60
Cache Controller i82497-60 (-66 will work as well)

J3- Serial port connector to operator panel board.
J5- The "Flash ROM bank" switch -by the way- was originally planned for a sort of "emergency mode". Once you screwed up the Flash-BIOS you could toggle the bank, insert any working flash update in the FDD A: and restart the  machine, which takes the flash-image from the floppy drive and recovers (as it can be done on the 704 in the "Bios recovery mode"). However: the base boot-BIOS did not have the required routines to delete the loused up bank of the Flash-ROM ... and as far as I know the loading of an image from Floppy  does not work. Another useless feature. 
J6- Known but to God. Shocking news! This jumper has been reported on a P66 complex!!
Artifact- Serial Link J5 on Type 4 complexes  (-xNx, -xPx, -xQx, -xYx)
     The serial link was (as far as I know) intended for the use with an earlier system management adapter, which didn't made it to the salesroom. The idea was to supply a sort of status-link to the processorboard and the   SCSI- adapter(s) and the (possible) backplanes on the later servers. 
Cache controller  Try HERE and search for A82497-60. Thanks, Senum!
CR1 and CR2 Diagnostic LEDs. 

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).

Complex Main Page
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br>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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