P 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
"P" / Upgrade Pentium 60 MHz  52G9362
      Intel Pentium Overdrive 133MHz (POD133/120)
496 vs. 497 Cache Controller

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 
* 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)..

Synchrostream Chips 
From Peter
>That means there are four versions/generations? 
   In a way, yes. The yellow SSD can be found on 25MHz boards only - or *should* be present on 25MHz systems only (Lacuna and old Server 720 bridge cards probably), generally none of the older versions made it into wildlife in significant amounts. I have seen one silver capped SSC
on one P90 platform in an early Server 500 we used at IBM training center for technical training and this "raw SMD" version (looked like a "yellow" but with transparent acrylic cover) on a 33MHz Lacuna replacement board I got as a spare from IBM Greenock - in the vain attempt to fix the OS/2 video problems under 2.1 ...

>Does this also apply to the P90 complex as well?
   I don't think so. I guess they can be found on very early versions only- if ever. I don't think that the "silver capped" version was intended for general marketing. The chip itself looked a lot like a lab proto. Usually the "silver capped" chips have the pins undersides in a sort of PGA arrangement with IBMs' patented ball-contact soldering - the SSC is a SMD ship with very dense pins along the sides. The IBM ESD cap there wasn't a can like usually, but more a shield only glued on top of the ceramic chip carrier. Had the usual engraved lettering with IBM ESD54 {7-digit P/N} {date of mfg/sequence number}.

BIOS Releases
BIOS revision 10 is for systems with the 859x system board that have been upgraded to a type 4 processor complex ( 486DX/2 33/66Mhz, Pentium 60Mhz, Pentium 66Mhz, or Pentium 90Mhz). Servers with the 959x system boards (e.g. 9595 and PC Server 500) with a type 4 processor should continue to use BIOS revision 8; BIOS revision 9 will provide NO enhancements for these systems. 

Flash Bios 10   Resolves an ABIOS time/date defect for OS/2 ONLY.
  10 Readme.txt
Flash BIOS 09 Seems to have an OS/2 bug. Not on PCBBS anymore...
Flash Bios 08 Works as of 20 Apr 00
   08 Readme
   08 READOS2.ME
Flash BIOS 05
Flash BIOS 02

Got a 8595-OKD that came with a Type 4 (P60) complex. Every time I start it up, Win 95 comes up with the 1980 date. I can take the ref disk and use "Set Time and Date" and it will show the correct day and month, but the year will be 2799. Is that Y2K complient or what? You can change the date and exit back to the Main Menu, then go right back in Set Date and Time and it is
back to the "2799" thing. It has revsion 08 bios. Any ideas?

The Revsion Level 10 cured the problem. It seems Win 95, at least SR2, has the same date problem as OS2 when upgrading a 8595 Type 1 or 2 complex to a Type 4 (P60/66).

Trying to flash BIOS 5 and up from 03 or Lower
  I ran into a problem with an N on a 9590. The BIOS was either 01 or 03, and it refused to configure with the new BIOS until I had used the old refdisk on Peter's IMMASTER. Booted and configured with the downlevel refdisk, flashedto 10, then reconfigured with the latest refisk.

Do you need the oldest refdisk? Ask ME

Complex BIOS Levels

I found it again!!!

Hi Louis !
 >Peter, whatthehell is each level bios (05, 08, and 09) actually supposed to fix?

  Ugh ... have some trouble to recall the changes.
      The earlier levels (prior to 03) were designed for the original P60 / P66 and "enhanced 486DX2" Type 4 platforms. 
   Level 00 / 01 was the first shipment level but had some trouble with the SCSI adapters (F/W SCSI-2 and Server 95 Raid), especially under OS/2.
    Level 02 (rel. 02-23-94) was a first "quick & dirty" attempt to fix it - which was not that successful.
     Level 03 (rel. 09-15-94) finally got it, but had other trouble (cannot remember). OS/2 2.0 required new IBM2SCSI.ADD and DELIVERY.SYS for support of the Server95-Raid adapter. Older IBM2SCSI trap the system if used with Level 03 and above (no longer a topic anyways  ). This level adds Fast/Wide SCSI-2 support within the OS/2 drivers.
     Level 04 (rel. 02-28-95) was supposed to fix all Raid-, Time/Date-, FDD and CD-ROM (boot) problems under OS/2 - but had a major problem with the memory - was withdrawn and replaced against Level 05 within a month. 
     Level 05 (called "Version 1.24 Level 05", rel. 03-22-95) had major changes, especially for OS/2 2.x and required a new, later reference / diags disk version. Level 05 was the first level to support the P90 platform regularly. (all earlier might display wrong cpu informations in diags / setup).
     Level 06 ... never seen. Either never issued or superseeded before release.
      Level 07 (rel. 10-27-95) ... no idea. Has been an intermediate release May have contained a "work-around" for the P90 FPU-bug (but not sure !). 
      Level 08 (rel. 01-16-96) came to fix "various problems" with the P90 platform and the IBM Fast / Wide Streaming Raid Adapter /A - which came with the Server 500. Level 08 was mainly intended to be used with the 8641 (Server 500) only, since the F/W-SR was not generally announced for the 9595A (but works though - the number of drives however was limited to 3 due to power- and heat-problems).
      The Level 08 might have various sublevels (avoided to write "subversions" ... some people might get that wrong :-) ), which differ by date of announcement but aren't explained anywhere. Most likely they fix some typo-errors / different language support.
       Level 09 (rel. -funny-  01-16-96 still) now - as it seems - is the last Level 08 with integrated Y2K rollover fix. Rem.: The (rel. mm-dd-yy) refers on the date the $000x000.IML files have.
       Level 10 Resolves an ABIOS time/date defect for OS/2 ONLY.  But-. It seems Win 95, at least SR2, has the same date problem as OS2 when upgrading a 8595 Type 1 or 2 complex to a Type 4 (P60/66). 

        Would say that Level 05 was the first BIOS that really worked. If your machine has a downlevel BIOS - use at least 05 if you have an IBM Fast/Wide SCSI-2 Adapter /A or the IBM SCSI adapter with cache /A. If your machine has the Server95-RAID adapter /A (codename "Passplay" without external port) or the IBM Fast/Wide Streaming Raid Adapter /A (codename "Cheetah" with external port) you should have Level 08. 
         Does that answer some of your questions ?
         Very friendly greetings from Peter in Germany
                         - Please respond to : peterwendt@aol.com -

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
   The Type 4 processor board  has two LEDs; one in position CR1, and one in CR2.  CR1 lights momentarily at the start of POST, then turns off, CR2 stays on during POST, then turns off..

"P" / Upgrade Pentium 60 MHz  52G9362 

CR1-CR2 Diagnostic LEDs. CR1 lights momentarily at the start of POST, then turns off, CR2 stays on during POST, then turns off..
J?   Present on some P60/P66 complexes. Function unknown
J3 Serial port connector to operator panel board.
J5 Serial Link Intended for 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. 
JMP5 Flash ROM bank switch  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 lacked 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.
OS1   60 or 66 MHz oscillator. CPU Bus clock. You can replace a 60 with a 66 MHz osc.
U3   10G3407 Flash BIOS, Odd ?
U5   10G3372 Flash BIOS Even ?
U11   Socket 4 (5v) for Pentium 60
U13   87X0079
U17   A82496-60 (or 66)Cache controller  Try HERE search for A82496-66. Thanks, Senum!  It uses the ten square black chips along the top edge. Those chips are 82491-66
U23   10G3441  SynchroStream Controller Can be yellow or blue. Currently investigating if there is any meaning to this difference as is the case with the 76/77 planars.
U24   50G8192 Unknown DMA Controller?
U25   Linear Technology LT1085CT Voltage Regulator

P Complex Back

OS2 40 MHz MCA Bus Clock

Intel Pentium Overdrive 133MHz (POD133/120)
From Terminaut
   I dug through craploads of old Intel documents today, and found my notes from Intel (circa '95) for the Pentium Overdrive 133MHz (POD133/120) processor.
   Written in plain ingles, the Intel doc says: "will not support the 82496 Cache Controller and 82491 Cache SRAM chip set"
   Additionally, the documentation states that the POD133 is designed to support _PCI_ chipsets.
Some other notes:
 - IU, IV, and IBT plus have been removed
 - branch trace pins (BT[3:0]) have been removed (no execution tracing)
 - breakpoint pins (BP[3:0]) have been redefined such that each assertion of one of these pins indicates that 1 to N BP matches occurred, where N =core/bus frequency ratio
- STI/CLI (restore/clear interrupts) are each 2 clocks shorter

496 vs. 497 Cache Controller 

 From Dr. Jim Shorney 
   Overdrive processors are not compatible with the '496 cache controller on the P60/66 complexes.  However...  I swapped out the '496 cache controller on mine for a borrowed '497 (well heatsinked)  and was able to boot DOS with a POD 133 on my P60 (overclocked to 66).  It wasn't entirely stable, and would not boot OS/2 Warp 4.0 or NT 4.0.  The Powerleap PL54C interposer was still dead in this configuration.  There may yet be hope, I haven't tried the Powerleap with anything other than an Intel 166 yet, and I may also downclock the complex back to 60 MHz and see what happens.  There may yet be hope... 
      The '497 reportedly has a 3.3v core, but it seemed to run stable and reliable for several hours with the stock P60 CPU in my system in place of the 5v '496.   I briefly looked over the docs this afternoon (712 pages, wow...). Seems the '497 is still a 5v part, it is the I/O buffers that connect to the CPU that are 3.3v.  This probably explains in part why the chip doesn't self-destruct in the '496 socket.  It also seems to invalidate the need for an  interposer, since the P60/66 I/O is 5v anyway and the buffers would have to run at 5v to interface at all with the CPU.  This brings up the question of noise immunity, though - will circuits designed to run at 3.3v logic levels be more or less sensitive to noise or poor signal quality when run at 5v?  Inquiring minds want to know. 

From Tony Ingenoso
    I suspect noise is going to be less of a problem at higher voltages Jim.  In theory, the voltage range for correct operation would be wider(particularly for CMOS).  The only reason I ever saw (other than laptop applications) for the drive to lower voltages was to limit heat as the gate counts and frequencies went up.  CMOS parts like high voltages -- you can crank clock speeds faster with higher voltages(the standard overclockers trick).  Discrete type CMOS parts can often be run as high as 20V and work fine.  The downside is that its power characteristics start approaching those of TTL at the higher speeds (and heat goes up).  If the only nominally 3.3V sections of the cache controller are the line drivers/buffers, there's probably not going to be enough stuff getting overvoltaged to make any significant difference in the power draw. 

9595 Server 95 (AKA "Server 95 560") 
9595-0PT - P60, 16/256MB (ECC), 1GB SCSI-2 F/W, 2.88
9595-0PTF - As above - Canadian French
9595-0PV - P60, 16/256MB (ECC),2GB SCSI-2 F/W, 2.88
9595 Server 95 Array Models (called 95A) 
9595-3PG - P60, 16/256MB (ECC), 3 x 540MB SCSI-2 F/W, 2.88
9595-3PT - P60, 16/256MB (ECC), 3 x 1GB SCSI-2 F/W, 2.88,

9595 Main Page