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AT COMBO CARD

APPARAT, INC.

AT COMBO CARD

Card Type

Multi-I/O

Chipset

Unidentified

Maximum Onboard Memory

3MB DRAM

I/O Options

Parallel port, serial port

Data Bus

16-bit ISA

CONNECTIONS

Function

Label

Function

Label

Serial port

CN1

Parallel port

CN2

USER CONFIGURABLE SETTINGS

Setting

Label

Position

Serial port address set to COM1: (3F8h)

E1

Pins 2 & 3 closed

Serial port address set to COM2: (2F8h)

E1

Pins 1 & 2 closed

Parallel port address set to 378h

E3

Pins 2 & 3 closed

Parallel port address set to 278h

E3

Pins 1 & 2 closed

Serial port enabled

E5

Closed

Serial port disabled

E5

Open

Parallel port enabled

E6

Closed

Parallel port disabled

E6

Open

Note:Disabling a port does not disable its respective interrupt; this must be done with the interrupt setting jumpers.

STARTING MEMORY ADDRESS SELECTION

Setting

System Board Memory

SW1/1

SW1/2

256KB

256KB

On

On

512KB

512KB

On

Off

1024KB

640KB

Off

On

1408KB

1MB

Off

Off

DRAM CONFIGURATION

Starting

Address Setting

Bank 0

Bank 1

Bank 2

Bank 3

Bank 4

Bank 5

256KB

(18) 256K x 1

None

None

None

None

None

256KB

(18) 256K x 1

(18) 256K x 1

None

None

None

None

256KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

None

256KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

256KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

256KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

512KB

(18) 64K x 1

None

None

None

None

None

512KB

(18) 64K x 1

(18) 256K x 1

None

None

None

None

512KB

(18) 64K x 1

(18) 256K x 1

(18) 256K x 1

None

None

None

512KB

(18) 64K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

512KB

(18) 64K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

512KB

(18) 64K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

1024KB

(18) 256K x 1

(18) 256K x 1

None

None

None

None

1024KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

None

1024KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

1024KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

1024KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

1408KB

(18) 256K x 1

(18) 256K x 1

None

None

None

None

1408KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

None

1408KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

None

1408KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

None

1408KB

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

(18) 256K x 1

Note:Bank 0 may be used for either base (conventional) or extended memory, but not both. Therefore, when the starting address is set to either 256KB or 512KB, Bank 0 is used to raise the base memory to 640KB. Any remaining memory in Bank 0 is ignored.

DRAM SWITCH CONFIGURATION

Number

Banks

Installed

SW1/3

SW1/4

SW1/5

SW1/6

SW1/7

SW1/8

1

On

Off

Off

Off

Off

Off

2

On

On

Off

Off

Off

Off

3

On

On

On

Off

Off

Off

4

On

On

On

On

Off

Off

5

On

On

On

On

On

Off

6

On

On

On

On

On

On

Note:SW1/3 to SW1/8 enable Banks 0 through 5 respectively. Banks 3, 4, and 5 are located on a daughterboard. The locations of the memory and daughterboard headers are unidentified.

SERIAL PORT INTERRUPT SELECTION

Setting

E2

IRQ3

Pins 1 & 2 closed

IRQ4

Pins 2 & 3 closed

Disabled

Open

PARALLEL PORT INTERRUPT SELECTION

Setting

E4

IRQ5

Pins 1 & 2 closed

IRQ7

Pins 2 & 3 closed

Disabled

Open

MISCELLANEOUS NOTES

The banks on the AT Combo card must be completely populated before the daughterboard can be used.

The daughterboard contains banks 3 through 5.