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

Function

Label

Function

Label

26-pin parallel port

CN1

25-pin serial port

CN2

USER CONFIGURABLE SETTINGS

Function

Label

Position

Parity check enabled

J4

Closed

 

Parity check disabled

J4

Open

Real Time Clock enabled

J9

Closed

 

Real Time Clock disabled

J9

Open

DRAM CONFIGURATION

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.

DRAM JUMPER CONFIGURATION

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

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

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.

SERIAL PORT ADDRESS SELECTION

Setting

J5

J6

COM1 (3F8h)

Closed

Open

 

COM2 (2F8h)

Open

Closed

 

Disabled

Open

Open

SERIAL PORT INTERRUPT SELECTION

IRQ

J2(pins 1 & 2)

J3(pins 2 & 3)

IRQ4 (COM1)

Open

Closed

 

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.