191-079 PS/2 Model 70 386 (081, 161, A81 AND A16)
189-144 New Models of IBM PS/2 Model 70 386 (8570-061 and 8570-A61)
188-079 PS/2 Model 70 386 (8570 E61/121)
188-078 PS/2 Model 70 386 (8570-A21)
SHS64F3993 IBM PS/2 Model 70 HMR
SHS15F2197 IBM PS/2 Model 70 HMS
Type 1 Planar (386 16 MHz or 20 MHz)
Type 2 Planar (386 20 MHz)
Type 3 & 4 Planar (386 or 486 25 MHz daughterboard)
Reply OEM Planar (486 33 MHz)
8550 and 8570 - Common Devices
Sigma Data Quick Easy Disk Adapter (replacement riser w/ IDE)
8570 and Cyrix 386 > 486 Processor Upgrade Didn't Happen as Claimed!
Model-Type to Planar Reference
Mouse Locking Up 8570 During Boot
Integrated Fixed Disk and Controller ADF
E61 - 386-16, 1MB, 60MB, 1.44
121 - 386-20, 2MB, 120MB, 1.44
061 - 386-20, 2MB, 60MB, 1.44
A61 - 386-25 w. 64kb cache, 2MB, 60MB, 1.44 **
A21 - 386-25 w. 64kb cache, 2MB, 120MB, 1.44 **
** 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 Type 3 & 4 Planar page.
Model-Type to Planar Reference (from Tim O'Connor)
8570-E61 long planar: 16 MHz - FRU 93F7309
8570-E61, -081, -061 short planar: 16 MHz - FRU 41G3984
8570-061, -081, -121, -161 long planar: 20 MHz - FRU 96F7308
8570-061, -081, -121, -161 short planar: 20 MHz - FRU 41G3985
8570-Axx: 25 MHz - FRU 92F0580. 80386 processor board FRU 15F7659
8570-Bxx: 25 MHz - FRU 41G3979. 80486 processor board FRU 92F0103
Min/Max on system board:
1/6 MB (Exx,1xx), 2/8 MB (Axx/Bxx) (expandable to 16 MB)
85 ns SIMMs on 16 MHz and 20 MHz planars, 80 ns SIMMs on 25 MHz planars
ROM: 128 KB
Cache: 0 KB (Exx), 0 KB (1xx), 64 KB SRAM L2 cache (386 25 MHz planar only)
Memory Trivia (from Tim O'Connor)
These machines should all be easy to cope with provided you give them
72-pin, gold-tinned parity SIMMs at least 85 ns fast for all but Axx and Bxx;
those two will need faster refresh 80 ns SIMMs. The FRUs to use would be
92F0104 (85 ns) and 92F103 (80 ns)... or you can do 'British Museum' approach
and simply try a SIMM out and see how the machine responds - either with an
error, or the 'Automatically Reconfigure (y/n)?' dialog. The virtue of the
trial-and-error method is that no brain cells whatsoever get hurt, but it might
involve repeatedly opening & closing the machine's case - and increasing
the risk of an inadvertent static discharge to your system.
The AXX & BXX critters are constructed differently, they will allow you
to put as much as 8MB on the planar in two 4MB SIMMs, all others have a maximum
motherboard limit of 6MB divided into 3 2MB SIMMs. The maximum amount of memory
any 8570 system will talk to is 16MB unless you do some creative finagling (See
IBM Memory Expansion &
BOPT103.EXE). This is due to the DMA (direct MEMORY access, get it?)
controller only having 24 address lines - which gives you 16MB worth of
individual addresses. Now while we can all stand around and criticize IBM for
this shortsightedness, it might be helpful to remember the prices for SIMMs in
about 1989 and what software demanded of a system then. You can still have a
very nice system (multitasking, GUI-enhanced, TCP/IP-able) in 16MB or less if
you pick the right software for it.
Mouse Locking Up 8570 During Boot
Konradin Stenner wrote:
I have four 8570 ( -161 and -121s) with a boot problem. These
8570s have a dual async adapter and an NI GPIB card installed and are used to
control spectrometers [which cost 500,000 DM new] and they cannot change the
During boot happens nothing when the mouse, no matter which one I
use, is connected. The monitor does not go from standby to operate mode, there
is no harddisk or disk access to see. When the mouse is disconnected system
does boot. When I connect the mouse during the boot, it works fine.
Dr. Jim Shorney says:
Clean the system board and power supply with compressed air. An
excessive buildup of dust can cause strange problems.
Also, this may sound totally off-the-wall, but try a different
keyboard. The KB and mouse use the same controller. Or, the mouse port
connector could be worn out or damaged, have broken solder connections, etc.,
which could be causing a latchup of the data lines when a mouse is plugged
Konradin reports success:
Thanks all, and special thanks to Jim, who had the right idea! The
DEC keyboard was changed to a Dell keyboard and now the machine does boot.
Alban Kellerbauer wrote:
Some of you may remember that I repeatedly inquired about other
people's experiences with overclocking PS/1 and PS/2 machines, where by
overclocking I mean replacing the clock oscillator with a faster one. Since
nobody seems to have done this before, I had no choice but to try it
I have a model 8570-061 that came with a 386DX-20 running, obviously, at 20
MHz (clock oscillator at 40 MHz). I de-soldered the oscillator and inserted a
full-size oscillator socket (there are solder holes for either a half-size or a
full-size oscillator). The socket permitted me to try different oscillators
without soldering and de-soldering more than once.
I found the socket in the Digi-Key catalog (part number A462-ND). I then
replaced the CPU with a 386DX-33 and inserted first a 66 MHz oscillator
(Digi-Key part number CTX137-ND), which didn't work, and then a 50 MHz
oscillator (part number CTX121-ND), which worked. Just in case that wouldn't
work either, I had also bought a 40 MHz oscillator (part number CTX120-ND),
because the de-soldered oscillator's legs are not long enough to firmly sit in
the socket. I had the 8570 running DOS and Windows 3.0 running for several
hours without any problems.
AdapterID DF9F Integrated Fixed Disk and Controller
DMA Arbitration Level
DMA channel used to transfer data
<"Level 5">, 6, 7, 0, 1, 3, 4
DMA Burst Pacing Interval
Time interval between DMA transfer bursts during which the Micro
Channel is released by the fixed disk controller for use by the processor.
31, 16, Burst Disabled"
DMA Pacing Control
Enables or disables the DMA Burst Pacing Interval.
Time to Release
This controls the amount of time that the fixed disk controller
will keep the Micro Channel after being preempted. If the 'DMA Pacing Control'
is set to <Enabled>, the Time to Release will default to immediate.
Under normal circumstances, select <6 Microseconds>.
<"6 Microseconds">, 3, Immediate
Bus Arbitration Fairness. This controls whether the adapter will
release control of the bus when it has been using it exclusively
Primary/Alternate Port Addresses
Port addresses used by the adapter. Either <Primary> or
<Alternate> will work equally well. If there are two integrated fixed
disks, then select <Primary> for one and <Alternate> for the other.
<"Primary" (io 3510h-3517h)>,