386 CPU Upgrade 

   I started MCA with 486 class machine and I'm not so familiar with 386 class computers and upgrade parts for those systems. Most of the products in my hands were collected at various Junk parts shops.  Some were alive and the others were dead maybe, not sure.

I'm wondering if  CPUs used for these Evergreen upgrades were really a "IBM486SLC3" processor or not.
Outlines for IBM 486SLC3 Processor upgrade in Louis's page seems that a CPU used for the upgrade card is same size with intel 386SX ( U4/SLC3 is smaller than U2/387SX ).  And also it is almost same with a CPU outlined in IBM486SLC2 Upgrade page.  While the chip used in Evergreens 3x speed upgrade in my hand is bigger than those used in above mentioned upgrade by IBM. The chip is just same size with IBM486BL3 used for their Processor Upgrade for 386DX systems. It seems to me that a real 32-bit Blue Lightning ( BL3 ) was used  for 386SX upgrading.   IBM486SLC2 is always refereed as "SLC2"  but not as "Blue Lightning ( at least  in old PC magazines in Japan ) .    Would like to see an exact "IBM486SLC3" used on "IBM 486SLC3 Processor Upgrade Kit or in model 57SLC3.

The model in pictures below is rated 20/60MHz but it is capable to run in 75MHz.  Don't know exact part  number  because  I got it free as "Junk" without packaging box.  Most possibly it is  # 300.    It run fine on 5530-U ( intel  386SX system ).  Then I tried to load it on 8557 Ultimedia and, in order to put it on IBM386SLC2 on the planar,  I grooved one corner of CPU holder.  Unfortunately 8557 didn't work  with the upgrade.  I didn't check further to clarify the reason why it didn't boot. 

Easy to use. Just snap it on atop of existing 386SX CPU. 
 
 

IBM486SCL25/25 was not available as a CPU "unit". Some of PC upgrade shop soldered off  IBM486SLC2s from PCB and then used those chips for their Laptop upgrade program.  One in my hand is a such PCB. 
You can see there are two set of solder pads ,for bigger cpu and smaller cpu. It's difficult to confirm through  photo but actually the inner solder pads were used ( CPU was once there. ).
 

Important note:
  This  upgrade cpu is not compatible for systems which has a 386SX in step A and step B.
  Test your system using SXCHK.EXE if it yours is compatible with this upgrade. 
  SXCHK.EXE is contained in REV to 486 cache utility diskette.

    TI486SLC2 has 8KB L1 cache and it should be faster than Cyrix 486SLC with 1KB L1 cache.
 

  When I pull off the CPU from the associated socket to take pictures,  A14 pin was torn off !   Oh, my... 
  Can I solder the pin ??? 

If you don't consider clock rodding of Kingston Lightning 486 or 486Now,  REV to 486 386DX3+  is the fastest upgrade part to boost your 8570 or 8580.  There is a socket for co-processor but I have not ever seen co-pro for BL2/BL3 which fit to the socket on the PCB. Even without co-pro,  Evergreen's BL3 upgrades are really powerful.   A weak point of Evergreen's upgrades using  BL3 for 386 PGA socket is it's pin connection between PCB and  PGA socket.  Pins are soldered on solder pads on the surface of the PCB without holes. Thus excessive usage pushing it onto the PGA socket and removing it off from the socket may break the pin soldering like a picture below ( leftmost ) . 
 

Click image to enlarge. You can see  pins are not go through PCB, they  are soldered on the PCB.

Markings on the chip are;    TopLine     BQFP100T25-3.7

     Mine is from "garbage box" and without connection pins for PGA socket. I have both 20MHz and 33MHz 
     versions but both of them have not pin extender. 
     Would like to check if it can take 5x86ers. 

     486NOW.EXE   PS/2 486/Now! disk w/drivers. ( 240KB )
     COP487.SYS     Divide by zero error fix for 486/NOW! .( 1KB )
 
 
 

For detailed information please click here ( Louis's page mirrored by William Walsh ).  The  page explaining about IBM 486DLC2 Upgrade but it is Kingston equivalent.

    486BL66.EXE     Lightning/486 (486BL/66) Diskette v1.0. 22KB
    LIGHT486.EXE    Lightning/486 Drive v1.2b.  151KB

    I don't have this one !

     MCMR236.EXE    MCMaster Utility Diskette v2.36  ( 218KB )
     MCMR235.EXE    MCMaster Utility Diskette v2.35  ( 266KB )
     MC2351.EXE       MCMaster Utility Diskette v2.35I  ( 57KB )

     picture is not ready

Brief tips for MCMaster
     1.  Do not use 2MB SIMMs.  it's not usable on MCMaster.
     2.  You can install two of  32MB SIMM  for 32bit system. ( I myself confirmed 16MB x2 on it. I didn't have
          32MB SIMMs back then ).
     3.  You can use 5x86 CPUs like Cyrix 5x86 or AMD 5x86-133 using voltage interposer but you will loose 
          a neighboring BUS slot.  For 8580 25MHz system, MCMaster and 5x86 CPU is recommended.
 

Make it 486
      TI486SLC50

When I bought my first 5570-V ( 8580-Axx analogous ) from a individual trader, the seller sold me some of  386 upgrade CPUs very cheap ( almost free ).  "Make it 486" was included in the volume.  Unfortunately now I don't have it. I gave it to a friend of mine.
Pictures below is scanned image of it's packaging box. As far as I remember outlook of  the kit (CPU) is different from a picture of the package.
In order to activate L1 cache, a special cache utility is required.  The driver was supplied in 5.25" floppy so I had to buy an external 5.25" floppy drive to read the driver.  I tested it on my 5541-T ( 386DX-20 system ). It was faster than Cyrix upgrades but slower than Evergreen's  REV to 486 386DX3+ in clock-doubled 50MHz operation.

  Pic #1  Front of the package
  Pic #2  Back of the package
  Pic #3  Important note  ( it says a CPU was different version from the pictures in the installation manual.)

  Make it 486 utility  ( DXP format. requires 720KB floppy )

    Brief note from "Setup Programs" guide sheet in the diskette envelope.
    " The Make-it 486 modules start up with the on-board cache not activate. This is a feature of the
      processor chip. The cache is required for high-speed operation of your new 486. Activation of the
      cache is accomplished by running a program each time your computer is powered up. A program
      to activate the cache ( CACHE486.EXE ) and a set-up program is on this diskette "
 

IBM 486SLC2/SLC3 and Blue Lightning     IBM has some Information about their products at their web sit.
 

Product	Packaging	Based ON	486 Instruction	L1 Cache	External BUS	Rated	Vcc
386SLC	QFP	i386SX		8KB	16-bit	20-25	5V
386SLC2	QFP	i386SX		8KB	16-bit	40-50, 2x	5V
486SLC	QFP	i386SX	Supported	16KB	16-bit	25	3.6V
486SLC2	QFP	i386SX	Supported	16KB	16-bit	50, 2x	3.6V
486SLC3	QFP	i386SX	Supported	16KB	16-bit	75, 3x	3.6V
486DLC2 or 486BL2	QFP	i486SX	Supported	16KB	32-bit	66, 2x	3.3V
486DLC2	PGA	i486SX	Supported	16KB	32-bit	66, 2x	5V
486BL3	QFP	i486SX	Supported	16KB	32-bit	75, 3x	3.3V

All of above listed CPU does not have Floating Point Unit( Math-CoPro ).
intel 486SX/DX has 8KB L1 cache.

Are you lucky?
Some laptops such as TP700/700C has an IBM486SLC25.  If you are lucky  your system may run in 50MHz inner speed using utility which enables clock-doubling circuit in the cpu (  if yours is actually a 486SLC2-50 
even though the system is rated at  25MHz ).  Few systems rated 25MHz have actually an IBM486SLC2-50.
For example, later model of TP550BJ ( with built-in Canon bubble-jet printer,  sold only inside Japan ) was 
announced that it had an "IBM486SLC" but  few of this model actually run at  50MHz when appropriate cache enabler is used. 

Cx486DLC Specs   132 pin PGA    25/33/40MHz   1KB L1 cache   Input Voltage :5V   Pi compatible with i386DX   TX486DLC is an equivalent.

Cx486SRX2 25/50M P
        Snap on kit upgrading 386SX system.   Don't know if it can be used in PS/2 or PS/55.
        This kit is compatible for i386SX in step C and later (  step D and combo step ) .
 

Cx486SRX2 Spec   Packaging: 100pin QFP   External BUS: 16 bit   1KB L1 Cache   I/O 5V   Pin compatible with i386SX   Base clock: 16/20/25.   Runs at 32/40/50

 
 

Err.. honestly speaking, I'm not so sure if this is for 286 systems or for  386SX systems. If this one is for 386SX, it should be installed to 387SX PLCC socket like IBM 486SLC2 upgrade for 855x.  But the CPU is Cx486SLC-25, then it may be for 286systems, I think... 
I can't check the card if it is dead or alive, also if it is compatible with PS/2 or not.  I don't have 286 system this moment.  I just got the card in a grab together with some of above mentioned Upgrades.
       Cx486SLC  ( SLC-25MP ) is used for this model.   Another model has a Cx486SLC/3-33MP ( 33MHz unit )
     on the PCB.    Most probably, these Cyrix 386 CPUs have 1KB L1 cache.