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MEGAPLUS (REV. 6)

AST RESEARCH, INC.

MEGAPLUS (REV. 6)

Card Type

Multi-I/O card

Chip Set

Unidentified

Maximum Onboard Memory

512KB DRAM (with MegaPak option)

I/O Options

Parallel port, serial ports (2)

Data Bus

8-bit ISA

Floppy drives supported

None

CONNECTIONS

Function

Label

Function

Label

Serial port 1

J1

DCE connector

J4

Parallel port

J2

Daughter board connector

J5

DTE connector

J3

   

USER CONFIGURABLE SETTINGS

Function

Label

Position

DTE pin select

JP1

Pins 1 & 2 closed

 

DCE pin select

JP1

Pins 2 & 3 closed

 

COM 1 enabled

JP3

Pins 3 & 4 closed

 

COM 2 enabled

JP3

Pins 5 & 6 closed

DRAM CONFIGURATION

Size

Bank 0

Bank 1

Bank 2

Bank 3

64KB

(8) 64K x 1

None

None

None

128KB

(8) 64K x 1

(8) 64K x 1

None

None

192KB

(8) 64K x 1

(8) 64K x 1

(8) 64K x 1

None

256KB

(8) 64K x 1

(8) 64K x 1

(8) 64K x 1

(8) 64K x 1

INTERRUPT CONFIGURATION

IRQ

JP4/A

JP4/B

JP4/C

JP4/D

JP4/E

JP4/F

JP4/G

JP4/H

IRQ2S

Closed

Open

Open

Open

Open

Open

Open

Open

IRQ2C

Open

Closed

Open

Open

Open

Open

Open

Open

IRQ3S

Open

Open

Closed

Open

Open

Open

Open

Open

IRQ3

Open

Open

Open

Closed

Open

Open

Open

Open

IRQ4

Open

Open

Open

Open

Closed

Open

Open

Open

IRQ4C

Open

Open

Open

Open

Open

Closed

Open

Open

IRQ5C

Open

Open

Open

Open

Open

Open

Closed

Open

IRQ5S

Open

Open

Open

Open

Open

Open

Open

Closed

MISCELLANEOUS TECHNICAL NOTES

Note: The purpose of JP2 is unidentified.