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)
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)
Mouse Locking Up 8570 During Boot
Integrated Fixed Disk and Controller ADF
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)
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.
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
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 in.
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 myself.
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)>,