LAVA COMPUTER MANUFACTURING, INC.
MULTIFUNCTION BOARD
|
Card Type |
Multifunction |
|
Chip Set |
Unidentified |
|
Maximum Onboard Memory |
512KB DRAM |
|
I/O Options |
Parallel port, serial port |
|
Hard Drives supported |
None |
|
Floppy drives supported |
None |
|
Data Bus |
8-bit ISA |
|
Card Size |
Full-length, full-height |
|
CONNECTIONS |
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|
Function |
Label |
Function |
Label |
|
26-pin parallel port |
CN1 |
25-pin serial port |
CN2 |
|
USER CONFIGURABLE SETTINGS |
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|
Function |
Label |
Position |
|
|
Parity check enabled |
J4 |
Closed |
|
|
|
Parity check disabled |
J4 |
Open |
|
Real Time Clock enabled |
J9 |
Closed |
|
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|
Real Time Clock disabled |
J9 |
Open |
|
DRAM CONFIGURATION |
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|
Size |
Bank 0 |
Bank 1 |
Bank 2 |
|
64KB |
64KB |
None |
None |
|
128KB |
64KB |
64KB |
None |
|
192KB |
64KB |
64KB |
64KB |
|
256KB |
256KB |
None |
None |
|
320KB |
256KB |
64KB |
None |
|
384KB |
256KB |
64KB |
64KB |
|
512KB |
256KB |
256KB |
None |
Note:Size of chips is unidentified. |
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|
DRAM JUMPER CONFIGURATION |
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|
Size |
SW/4 |
SW/5 |
SW/6 |
|
None |
On |
On |
On |
|
64KB |
On |
On |
Off |
|
128KB |
On |
Off |
On |
|
192KB |
On |
Off |
Off |
|
256KB |
Off |
On |
On |
|
320KB |
Off |
On |
Off |
|
384KB |
Off |
Off |
On |
|
512KB |
Off |
Off |
Off |
|
STARTING MEMORY ADDRESS CONFIGURATION |
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|
Starting Address |
Maximum RAM on LAVA Multifunction Board |
SW/1 |
SW/2 |
SW/3 |
|
64KB |
512KB |
On |
On |
On |
|
128KB |
512KB |
On |
On |
Off |
|
192KB |
512KB |
On |
Off |
On |
|
256KB |
384KB |
On |
Off |
Off |
|
320KB |
320KB |
Off |
On |
On |
|
384KB |
256KB |
Off |
On |
Off |
|
448KB |
192KB |
Off |
Off |
On |
|
512KB |
128KB |
Off |
Off |
Off |
|
PARALLEL PORT ADDRESS SELECTION |
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|
Setting |
J7 |
J8 |
|
LPT1 (378h) |
Closed |
Open |
|
LPT2 (278h) |
Open |
Closed |
|
Disabled |
Open |
Open |
Note: When IBM Monochrome Display/Printer adapter is installed in the system, the parallel port will automatically be reconfigured to LPT2 if the original setting was LPT1 and to LPT3 if the original setting was LPT2. |
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|
SERIAL PORT ADDRESS SELECTION |
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|
Setting |
J5 |
J6 |
|
|
COM1 (3F8h) |
Closed |
Open |
|
|
|
COM2 (2F8h) |
Open |
Closed |
|
|
Disabled |
Open |
Open |
|
SERIAL PORT INTERRUPT SELECTION |
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|
IRQ |
J2(pins 1 & 2) |
J3(pins 2 & 3) |
|
|
IRQ4 (COM1) |
Open |
Closed |
|
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|
IRQ3 (COM2) |
Closed |
Open |
|
PARALLEL PORT INTERRUPT SELECTION |
|
|
IRQ7 |
J1 |
|
Enabled |
Closed |
|
Disabled |
Open |
|
MISCELLANEOUS TECHNICAL NOTES |
|
The LAVA Multifunction Board requires switch settings on system board for PC-1, PC-2 and PC-XT. On PC-1 and PC-2 switches are set to represent total amount of memory installed. On PC-XT, switches represent amount of memory installed on system board only and do not include memory on Lava Multifunction Board. |