This document is for the full-sized (13.8" x 12.025") 80386-20 motherboard.
It's identifying features are: an LED between expansion slots 5 and 6; a
proprietary memory card slot as the seventh slot; a bank of eight switches
between slot 1 and the keyboard connector; four ROM sockets; 8-bit slots
for #2 and #6; 16-bit slots for #1, #3, #4, #5, and #8; and a socket
for an 80287 math coprocessor next to the CPU.
The bus speed for this motherboard is fixed at 10MHz. Peripherals which
do not support this higher bus speed may have difficulties running on this
20MHz motherboard.
+=============================+
+ +
+ MOTHERBOARD SWITCH SETTINGS +
+ +
+ * = Default setting +
+=============================+
1 Reserved *On
2 80287 Coprocessor installed On
80287 Coprocessor not installed *Off
80387 Coprocessor installed On
3 4 Mhz 80287 Coprocessor installed On
8 Mhz 80287 Coprocessor installed *Off
10 Mhz 80287 Coprocessor installed Off
4 Bios relocation enabled *On
Bios relocation disabled Off
5 Reserved *Off
6 Color video adapter *On
Monochrome video adapter Off
7 See below ---
8 Reserved *Off
If the M100C, or M400C memory card is installed, then switch 7 is
defined as follows:
7 Cache enabled *On
Cache disabled Off
If the M100, M200, or M300 memory card is installed, then switch 7 is
defined as follows:
7 Reserved *Off
+=============================+
+ +
+ MOTHERBOARD JUMPER SETTINGS +
+ +
+=============================+
J1 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
W1 Reset switch
Pin 1 - Signal
Pin 2 - Ground
W4 ROM size
Pin 1-2 128KB
Pin 2-3 256KB
W5 Reserved - always installed
W6 Memory card type
Pin 1-2 Static column memory card
Pin 2-3 Cache memory card
+==============+
+ +
+ MEMORY CARDS +
+ +
+==============+
M100 memory card:
=================
The M100 memory card can hold 1MB or 2MB. The first MB is usually soldered
on the board. This is the card that was most commonly used by CompuAdd.
NOTE: All of the memory on the M100 must be static column DRAM (as opposed
to page mode DRAM) in order for the 2M-08, or 4M-08 to operate.
There is a row of nine (9) jumper pins in the lower left corner of the
M100 memory card. They should be positioned as follows:
1MB Pin 2-3, Pin 4-5, Pin 7-8
2MB Pin 1-2, Pin 4-5, Pin 7-8
4MB Pin 1-2, Pin 4-5, Pin 7-8 (with 2M-08)
6MB Pin 1-2, Pin 4-5, Pin 7-8 (with 4M-08)
10MB Pin 1-2, Pin 4-5, Pin 7-8 (with 4M-08)
Recommended memory chips for the second MB
------------------------------------------
Hitachi HM51258P-8 256Kx1 static column DRAM
NMB AAA2800P-07 256Kx1 static column DRAM
NMB AAA2800P-08 256Kx1 static column DRAM
NMB AAA2801P-06 256Kx1 page mode DRAM (see note above)
M200 memory card:
=================
The M200 memory card can hold 4MB or 8MB using 1Mx1 DRAM. The top two rows
of chips make up bank 0, and the bottow two rows make up bank 1.
There is a set of five (5) two-pin jumpers in the lower left corner of the
M200 memory card. They should be set as follows:
W1 W2 W3 W4 W5
4MB ON ON OFF OFF OFF
8MB OFF ON OFF OFF OFF
12MB OFF OFF OFF OFF OFF (with 4M-08)
16MB OFF OFF OFF OFF OFF (with 4M-08)
Recommended memory chips
------------------------
Toshiba TC511000P-85 1Mx1 page mode DRAM
NEC D421000C-80 1Mx1 page mode DRAM
Samsung KM41C1000P-80 1Mx1 page mode DRAM
Motorola MCM511000P-85 1Mx1 page mode DRAM
Siemens HYB511000-85 1Mx1 page mode DRAM
Siemens HYB511000-70 1Mx1 page mode DRAM
Intel P21010-08 1Mx1 page mode DRAM
M300 memory card:
=================
The M300 memory card can hold 1MB, 2MB, or 6MB. Each of the first two MB
is made up of four (4) 256Kx1, and eight (8) 256Kx4 chips. The lower
four rows of chips hold 1Mx1 chips, and must be filled in completely. It
is not possible to partially fill the lower bank of memory.
There is a bank of eight (8) switches in the upper left corner of the
M300 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 OFF OFF OFF OFF ON ON OFF ON
2MB OFF OFF ON OFF ON ON OFF ON
6MB OFF ON ON OFF ON ON OFF ON
10MB ON ON ON OFF ON ON OFF ON (with 4M-08)
14MB ON ON ON OFF ON ON OFF ON (with 4M-08)
Recommended memory chips
------------------------
Hyundai HY53C256LS-80 256Kx1 page mode DRAM
NMB AAA2801P-07 256Kx1 page mode DRAM
NMB AAA2801P-08 256Kx1 page mode DRAM
Siemens HYB514256A-80 256Kx4 page mode DRAM
Samsung KM44C256AP-80 256Kx4 page mode DRAM
Toshiba TC511000P-85 1Mx1 page mode DRAM
NEC D421000C-80 1Mx1 page mode DRAM
Motorola MCM511000P-85 1Mx1 page mode DRAM
Siemens HYB511000-85 1Mx1 page mode DRAM
Siemens HYB511000-70 1Mx1 page mode DRAM
Intel P21010-08 1Mx1 page mode DRAM
M100C memory card:
==================
The M100C memory card can hold 1MB or 2MB. It has an Austek cache
controller in the lower left corner of the card. It accommodates either
the 2M-08, or the 4M-08.
NOTE: Static column DRAM (as opposed to page mode DRAM) is recommended when
using either the 2M-08, or the 4M-08.
There are two jumpers on the M100C memory card. W1 is in the upper left
corner, and W3 is in the lower left corner. They should be set as follows:
W1 W3
1MB Pin 1-2 ON
2MB Pin 2-3 ON
4MB Pin 2-3 ON (with 2M-08)
6MB Pin 2-3 ON (with 4M-08)
10MB Pin 2-3 ON (with 4M-08)
Recommended memory chips
------------------------
Hitachi HM51258P-8 256Kx1 static column DRAM
NMB AAA2800P-07 256Kx1 static column DRAM
NMB AAA2800P-08 256Kx1 static column DRAM
Panasonic MN41256A-08 256Kx1 page mode DRAM (see note above)
Sharp LH21256-08 256Kx1 page mode DRAM (see note above)
NMB AAA2801P-06 256Kx1 page mode DRAM (see note above)
NMB AAA2801P-08 256Kx1 page mode DRAM (see note above)
M400C memory card:
==================
The M400C memory card can hold 4MB or 8MB. It has an Austek cache
controller in the lower left corner. The M400C cannot accommodate either
of the memory expansion cards, as it has no connectors.
There are two jumpers on the M400C memory card. W1 is in the upper left
corner, and W3 is in the lower left corner. They should be set as follows:
W1 W3
4MB Pin 1-2 ON
8MB Pin 2-3 ON
Recommended memory chips
------------------------
NEC D421000C-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
2M-08 memory expansion board:
=============================
The 2M-08 provides an additional 2MB, and is compatible with the M100, and
M100C memory cards. It is not compatible with the M200, the M300, or the
M400C. The 2M-08 comes populated, and has no jumpers or switches to set.
4M-08 memory expansion board:
=============================
The 4M-08 provides an additional 4MB (expandable to 8MB) for the M100, M200,
M300, and M100C memory cards. It is not compatible with the M400C. There
is a bank of four (4) switches on the card. The settings differ for each
of the main memory boards.
Recommended memory chips
------------------------
Use the tables above for the 1Mx1 page mode DRAM chips used for the
appropriate main memory card.
With the M100:
--------------
S1 S2 S3 S4
6MB ON OFF OFF OFF
10MB ON OFF ON OFF
With the M200:
--------------
S1 S2 S3 S4
12MB OFF ON OFF OFF
16MB OFF ON ON OFF
With the M300:
--------------
S1 S2 S3 S4
10MB ON ON OFF OFF
14MB ON ON ON OFF
With the M100C:
---------------
S1 S2 S3 S4
6MB ON OFF OFF OFF
10MB ON OFF ON OFF