Rd9095a.exe Common Diagnostics for all 859x / 959x Systems
Upgrade 486DX2 66/33 MHz 61G2343
"N" / Upgrade 486DX2 66/33 MHz 61G2343
Supports 041xh and 043xh CPUIDs HERE David Beem put some thought into steppings.
If you get Intermittent 01291500 errors and intermittent hangs, or SYS000915 errors under OS/2 using an N complex, FRU 61G2343, then this ECA probably applies. NOTE: the upgrade Type 1 DX2-66 FRU 92F0145 is NOT affected.
To check if your complex is affected, note the manufacturing P/N on a sticker just below the CPU. If the manufacturing number is 82G3513, 06H3368, or 61G4072 with no patch wire on the back [described below], it is affected. NOTE: I have a 61G4072 with a patch wire on the front. It seems to work. But the U69 and U60 ICs do not match.
Complexi 06H7263, 06H7264, and 06H7265 with the wire patch are not affected.
Complexi with FRU 06H7266 are not affected. [ed. New level production?]
Wire Patch on Back
From Tatsuo Sunagawa
The board accepts 40.00M oscillator instead of 33.33M without any changes of BIOS. But with 45.00M, it doesn't work. I don't have same type oscillator, so I 'm using square metal package oscillator with socket.
(Ed. Does this mean an AMD/Cyrix 486DX-80 might work? The 486DX-80 was for systems with a 40MHz clock.... Watch the voltage! The DX-80 was a 3.45v chip, FAIK...)
But with this possible
Ed. Please report experiences... Also, do be careful- the parts may be able to take the overclock... Make sure the side fan works. Keep the complex clean.
Current N Upgrade Attempts
Complex refuses to run on a model 90, but came up on an M class 95 planar. Still refused to complete booting with anything other than a DX2-66. Interposer failed to enable booting with a POD. Possible timing or cache related problems.SynchroStream Controller Chips
Hell, yes! Tomas Slavotinek did some avant-garde impressionist performance art... The silver surfer [U47 50G8192] is the SSC.
The Blue / Yellow / Ceramic chip on the Pentium complexi, Lacunas, and certain Reply upgrade boards, are Bus Interface Controllers [BICs] and the current SWAG is Pentium OverDrive [83MHz POD] and true Pentium systems require the BIC.
Note that systems which can accept a 486DX4-100 -OR- a POD AND an L2 cache have the BIC. The 9585-K/N does NOT have the BIC, and I chalk that up to it being a "value server".
The N has a row of unused solder pads around the CPU socket. My SWAG is that IBM tried to design a 486/POD complex, but ran into cache coherency issues. It was [much] easier to go with a 486 socket and not implement POD support.
Editor: The Type 3
"M" has 40MB/s Streaming circuitry, but it is in
9595 Server 95 (AKA "Server 95 466") (Type 4 ref.