The 80386 I-Cache board is a full-sized (13.8" x 12.025") motherboard
which took all of its memory as DRAM plugged into a proprietary 32-bit
memory card. There are two versions of the I-Cache board, identified by
part numbers 09-00010, and 09-00021, which are silk-screened on the
component (top) side of the motherboard.
The most common memory card used with the I-Cache board is the M500. This
is part number 09-00011. The upper left corner has "385 Memory Board"
silk-screened on many M500 cards.
+=============================+
+ +
+ MOTHERBOARD SWITCH SETTINGS +
+ +
+ * = Default setting +
+=============================+
1 Reserved *On
2 80387 Coprocessor installed On
80387 Coprocessor not installed *Off
3 Bus speed selection (see below)
4 Bios relocation enabled *On
Bios relocation disabled Off
5 Reserved *Off
6 Color video adapter *On
Monochrome video adapter Off
7 Cache enabled *On
Cache disabled Off
8 Bus speed selection (see below)
Bus speed selection
-------------------
Switch settings -- * = default
---------------------------------------------
Board SW1.3=OFF SW1.3=ON SW1.3=ON SW1.3=OFF
Speed SW1.8=OFF SW1.8=OFF SW1.8=ON SW1.8=ON
----- --------- --------- --------- ---------
20MHz 5 Mhz 6.66 Mhz 10 Mhz * Undefined
25MHz 6.25 Mhz 8.33 Mhz* 12.5 Mhz Undefined
33MHz 8.33 Mhz* 11.33 Mhz 16.66 Mhz Undefined
+=============================+
+ +
+ MOTHERBOARD JUMPER SETTINGS +
+ +
+=============================+
J1 Keyboard connector
J2 External 6-volt battery connector
Pin 1 - Battery Positive
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Ground
J21 Keylock / Power LED
Pin 1 - Power LED signal
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - Keyboard lock signal
Pin 5 - Ground
J22 External speaker
Pin 1 - Speaker
Pin 2 - no connector
Pin 3 - Ground
Pin 4 - +5 volts
J25 External Keyboard connector
Pin 1 - Keyboard clock
Pin 2 - Keyboard data
Pin 3 - no connector
Pin 4 - Ground
Pin 5 - +5V DC
W1 Reset switch
Pin 1 - Signal
Pin 2 - Ground
W7 Co-processor configuration
Pins 1-2 Asynchronous Operation
No connection Synchronous Operation
W8 Co-processor configuration
Pins 1-2 Asynchronous Operation
No connection Synchronous Operation
W9 Turbo light connector
Pin 1 - Signal
Pin 2 - Ground
W12 Cache configuration
Pins 1-2 Direct mapped (32KB)
No connection Two-way set associative (64KB)
W13 Cache configuration
Pins 1-2 Direct mapped (32KB)
Pins 2-3 Two-way set associative (64KB)
W15 Turbo switch
Pin 1 - Signal
Pin 2 - Ground
W22 Non-cacheable region selection
Pins 1-2 E00000 - EFFFFF non-cacheable
No connection D00000 - DFFFFF non-cacheable
W23 Reserved
No connection
W30 Reserved
Pins 2-3
+==============+
+ +
+ MEMORY CARDS +
+ +
+==============+
M500 memory card:
=================
There is a bank of eight (8) switches in the upper left corner of the
M500 memory card. They should be set as follows:
SW1.1 SW1.2 SW1.3 SW1.4 SW1.5 SW1.6 SW1.7 SW1.8
1MB ON OFF ON ON ON OFF OFF OFF
2MB OFF ON ON ON ON OFF OFF OFF
4MB ON ON OFF OFF ON OFF OFF OFF
5MB OFF OFF OFF ON ON OFF OFF OFF
8MB OFF ON OFF OFF ON OFF OFF OFF
12MB OFF OFF OFF OFF ON OFF OFF OFF (with 4M-08)
16MB OFF OFF OFF OFF ON OFF OFF OFF (with 4M-08)
Recommended memory chips
------------------------
Hyundai HY53C256LS-80 256Kx1 page mode DRAM
Toshiba TC511000P-85 1Mx1 page mode DRAM
Samsung KM41C1000P-80 1Mx1 page mode DRAM
Motorola MCM511000P-85 1Mx1 page mode DRAM
Siemens HYB511000-70 1Mx1 page mode DRAM
Siemens HYB511000-85 1Mx1 page mode DRAM
Intel P21010-08 1Mx1 page mode DRAM
Samsung KM41C1000P-80 1Mx1 page mode DRAM
4M-08 memory expansion board:
=============================
The 4M-08 provides an additional 4MB (expandable to 8MB) for the M500
memory card. There is a bank of four (4) switches on the card. The M500
must be filled with 8MB before the 4M-08 will function.
With the M500:
--------------
S1 S2 S3 S4
12MB OFF ON OFF OFF
16MB OFF ON ON OFF