Type 4 "Y" 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
Complex Features
BIOS Updates
   BIOS Levels
   Flashing to BIOS 05 and up from 03 or Lower
FDIV Replacement
Support for Convenience Partition on >3.94GB Drives

Upgrading the P90 Complex [!]

"Y" / Upgrade Pentium 90 MHz
   "Y" Complex Front
   "Y" Complex Back
Memory supported, cache
178 Error
06H3739 vs. 06H7095
Upgrade Information

"Y" / Upgrade Pentium 90 MHz (06H3739, 06H7095, FCC ID ANO06H3729)

"Y" Complex Front *

06H3739 has an early Pentium with the FDIV bug. 06H7095 comes with a fixed processor.

CR1,2 Diagnostic LEDs
CR5 LED solder pads
J3 Serial Diagnostics Link to Op Panel
J5 Debug Port
J6 SDL POST Diag Jumper
JMP5 Flash ROM Bank Switch
OS1 60.0000 MHz Osc (CPU)
U3 Flash ROM BIOS 06H3743
U10,12,15,16,18 i82492-60 Cache SRAM
U13 87X0079 Clock Generator
U17 i82497-60 Cache Controller
U23 10G3441 ASIC
U24 8190587 SynchroStream Controller
U25 LT1085CT Voltage Regulator
U75 LT1084CT Voltage Regulator
U77 LIF Socket 5 for Pentium 90 (3.3 V)

U23 10G3441 ASIC - may be yellow (early) or blue (later). I have a ceramic version and Peter has seen a metal capped one.
U25 LT1085CT Adjustable Voltage Regulator with max. output current 3.0 A. The regulator is set to 3.7 (3.75) V and powers the SynchroStream Controller.
Note: The "U25" designator seems to be missing or is hidden under the heatsink (it's however visible on the largely identical "P" and "Q" boards).
U75 LT1084CT Adjustable Voltage Regulator with max. output current 5.0 A. The regulator is set to 3.36 V and supplies Vcore (core voltage) for the Pentium 90 processor and Vcc3 voltage for i82497 Cache Controller and i82492 Cache SRAM chips (i82497 and i82492 are 5 V parts, but I/O buffers interfacing with the processor are 3.3 V biased).

"Y" Complex Back *

OS2 40.0000 MHz Osc (Local Bus)
U1 MACH210-12JC CPLD, 82G3530
U5 Flash ROM BIOS 06H3741
U58,59,61,62,64 i82492-60 Cache SRAM
U72 MACH220-12JC CPLD, 82G3529

U3, U5 The Flash ROM chips on my complex are AMD Am29F010-120JC (128 KB, 5V Vpp). Datasheet HERE.
Note: This complex can program 5V parts only, as it doesn't have a local 12V Vpp generator.


   PS/2 72-pin SIMMs, ECC or Parity, 70 ns Presence Detect
   Min/Max on system board: 8/64 MB Parity, 8/256 MB ECC

   256 KB (2 x 128 KB) Flash ROM

   L1: 16 KB (Pentium 90)
   L2: 256 KB write-back

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

Please see the Upgrading the P90 Complex page.

9595 Main Page