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