Kingston 486 Now!

486NOW.EXE  PS/2 486/Now! disk w/drivers
COP487.SYS   Divide by zero error fix for 486/NOW!
486/Now! Installation Guide 486/33PD3 / 33PS3 / 25PS3

Note: The 486/Now! does NOT require a compatibility plug!

SW1 Settings
  486/Py3(-P70(LP)) series of 486 Now! upgrades, where xx- is either 25 or 33 and y=D (DX) or S (SX), LP is Low Profile
486/33PD3 - 486DX-33 upgrade, a 486/33PD3-P70 - 486DX-33 upgrade for the P70 (old style planar)

Kingston 486/Now

Note: SW1 is on the underside.

   The upgrade board is the same for DX and SX variants. The 486/33P(D/S)3-P70 is for the old style 8570-061 with the CPU socket below the expansion slots. The 486/33P(D/S)3-P70LP is for the newer 16 and 20MHz 8573-031/121 and the Japanese 5530.

   Warning! Dr Jim says: "Note that I have also seen the 20 MHz -061 planar used in the -121 model.  It is important that you get the right model for your planar, as the orientation of the CPU socket is different and the upgrade will not physically fit if it is not the correct one".

Carlyle Smith pops up out of lurk mode and says:
   BTW, your 486NOW! board _needs_ a heatsink on the CPU. Otherwise, system hangs after a while. I had to modify the drive shelf  (on a Model 70) by cutting out plastic to allow the aluminum fins to project up.

Note: The 486/Now! is not a clock multiplier like a Cx486DRx2. It runs the CPU on the PCB at the rated speed. So although it has an AMD Am486DX-40 on a 486/PD33, you set it to the system speed with SW1. I do not know what happens if you set SW1 to support a higher CPU speed. I guess that you would be taking a chance with the RAM and support chipset being fast enough.

   The P70 is the same as the base 486/P(D/S)3 units, but it has an extended PGA socket (about a quarter inch) to clear components on the P70 planar.
   The P70LP (Low Profile?) has Pin 1 moved towards the inside of the upgrade so it fits under the expansion slots.

SW1 Settings (Page 5 in installation manual)
Model                     1    2    3    4
8570 16 Long, 20 short   Off  On   On
8570 16 short            On   On   Off
8570 25 Long             On   On   On
5530  25MHz              On   On   On
8573 -031, 061, 121      Off  On   Off
8580 16 and 20 MHz       Off  Off  On
8580 25 MHz              On   Off  On
All Models Fast Post On                On
           Fast Post Off               Off

Note: SW1 Switch 4 default is ON, so the 486/Now will run POST at a fast 486 level. In some cases, an 8603 mouse error will occur because of the faster speed. Also if an IBM XGA adapter is installed in the system and a display problem occurs, changing Switch 4 to OFF should correct either problem.

Content created and/or collected by:
Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

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Last update: 08 May 2024 - Changelog | About | Legal & Contact