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These are the IBM planars, NOT the Reply Corporation planars.
Tim's IBM 8570 web pages rf7080a.exe
PS/2 8570/8580 reference diskette v1.12
Memory Min/Max on system board: 1/6MB (Exx,1xx), 2/8MB (Axx) (expandable to 16MB) Type of memory: RAM: DRAM (PS/2 72-pin SIMM) 85ns parity checked (3 sockets (4 on Axx models for 80ns SIMMS)) ROM: 128kb Cache: 0kb (Exx), 0kb (1xx), 64kb SRAM L2 cache (Axx only) 8570 Models
** These models can be upgraded
with the 486DX-25 "Power
Platform" and BIOS upgrade chips, making them a true 8570-486. The
planar is shown on the 8570-486
page
Opening a Locked 8570 Case (w/o a key!) From Peter Unscrew the two rear thumbscrews, push the upper case forward as far as possible .... then use a large flat blade screwdriver between upper case and rear wall and lift up the case for about 4 - 5 mm and push it over the lock .... Once having it open you can pull out the lock fixing bracket and remove the cover lock from the rear wall. You see: a potential intruder might only try hard enough to get in ... *thieves* steal the entire machine and break it open at home :-) Loosen cover screws. They are captive, so when they turn free, they
are done.
Slide the case forward about two inches then lift up.
Remove/Install the Planar Pull the floppy, hard drive, and drive riser. Pull up on all of the white platic snaps (get the one under the battery, too!). Pull the drive structure straight up. If it doesn't come up, check the white snaps again. You need to remove the power supply as well- the screw locations are carried over from the 8550 and one is directly under the front cornder of the PSU fan. Remove the three screws at the back of the system (right above the ports). Remove the screws holding the planar down (only three!). Now for all you 95 veterans, read carefully! Lift the planar straight up! They do NOT have a frame that the spring clip EMC bezel clips onto You may need to put your fingers in the port opening in back and pull up- the spring bezel fits inside of a recess. When installing the planar, push the spring bezel down until it snaps into place within it's recess. You will know when it isn't fully seated- the screws from the back will be too low to thread into the mounting points.
Pinout for Battery/Speaker connector
Clear a Power-On Password 
Model 50, 60, 70, 80 Override Jumper 1.Power-off the computer and unplug the power cord. 2.Remove the system-unit cover. 3.If the speaker assembly has pins, short pins 2 and 3 together. 4.If the speaker assembly does not have pins, insert a meter lead into connector 1 and short the other end of the lead to frame ground. With the assembly shorted, power-on the computer. This erases the power-on
password. Remove the short after POST is finished.
AdapterID DF9F Integrated Fixed Disk and Controller fixedresources int 0e DMA Arbitration Level
DMA Burst Pacing Interval
DMA Pacing Control
Time to Release
Fairness On/Off
Primary/Alternate Port Addresses
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6 pin Header Edgecard
Socket