Kingston 486 Now!
486NOW.EXE PS/2 486/Now! disk w/drivers
COP487.SYS Divide by zero error
fix for 486/NOW!
This covers the 486/Py3(-P70(LP)) series of 486 Now! upgrades.
xx- either 25 or 33 y=D (DX) or S (SX) LP is Low Profile
So a 486/33PD3 is a 486DX-33 upgrade, a 486/33PD3-P70 is a 486DX-33
upgrade for the P70 (old style planar)
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 sez:
"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 sez
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
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.
1 2 3 4
8570 16 Long, 20 short Off On On
8570 16 short
On On Off
8570 25 Long
On On On
On On On
8573 -031, 061, 121 Off On
8580 16 and 20 MHz Off
8580 25 MHz
On Off On
All Models Fast Post On
If a 8603 mouse error or an XGA display problem occurs, turn 4 Off.
9595 Main Page